JP5159300B2 - Simulation device - Google Patents

Description

  The present invention relates to a simulation apparatus in which a plurality of simulators perform simulation while exchanging data with other simulators.

When simulating a certain system, it is conceivable that each component of the system is simulated by an individual simulator and the simulators are operated in cooperation.
This technique is called “parallel simulation” and has advantages such as “reduction in execution time” and “reuse of simulator for another simulation”.
A system composed of a group of simulators operating in cooperation and software having a function of controlling the simulator is referred to as a “simulation system”.

Each simulator has a “time”, and gradually repeats the simulation to see what the future will look like based on the state at the current time and the data received from other simulators. To proceed.
At that time, each simulator transmits data to other simulators as necessary.
In general, data exchanged between simulators is given a “numerical value indicating which time the data corresponds to”, and this numerical value is called a “time stamp”.
Although several methods are conceivable as methods for advancing the time, a time step method is assumed in this specification.
In the time step method, the time progression (time step) of each simulator is always constant (however, the time step may differ depending on the simulator).

Here, the “time” is organized so that there is no confusion.
In general, there are three types of time concepts in parallel simulation. That is, there are “physical time”, “simulation time”, and “wall clock time”.
The “physical time” is the time in the simulation target system.
The “simulation time” is a representation of the physical time inside the simulator.
The “wall clock time” is the time on the side executing the simulation.

For example, consider a case where a train operation simulation on January 1, 2008 is performed. In this case, the physical time is considered to be in the range of “January 1, 2008 0:00 to January 1, 2008 24:00”.
In the simulation, when one hour is processed as one unit, the simulation time takes a numerical value in the range of “0 to 24”, for example. When the simulation is executed on the afternoon of December 1, 2007, the wall clock time is in a range of “December 1, 2007, 13:00 to 17:00”, for example.
Hereinafter, in the present specification, the expression “time” refers to the above simulation time unless otherwise specified. The simulation time of each simulator is also referred to as “logic time”.

Now, in order to execute the entire simulation without contradiction, “Each simulator must not receive data with a time stamp that is older than the current time”, “Each simulator must process the data in time stamp order. It is necessary to observe restrictions such as "I must not".
For this purpose, data distribution to the simulator and control of the time progress of the simulator must be appropriately performed. This function is called a “time management function”.

For example, in the construction architecture of a standardized parallel simulation system such as HLA (High Level Architecture, IEEE 1516), an interface of basic software RTI (Run-Time Infrastructure) for managing a simulator is defined.
The base software RTI has various functions for controlling the simulator, and one of them has a time management function.
All of the data communication between simulators and the time progress of the simulator are performed via the base software RTI.

Up to this point, a single simulation system has been described. However, there is a case where a large-scale simulation may be performed by operating a plurality of simulation systems in cooperation.
This corresponds to, for example, a case where it takes time to modify the simulator or the like in order to collect a plurality of simulation systems and reconfigure them into a single simulation system.
Therefore, a method has been proposed in which data distribution between simulation systems is performed via a special simulator (bridge) (for example, see Non-Patent Document 1 and Non-Patent Document 2).

However, in the connection method of a plurality of simulation systems using a bridge, there is a possibility that a delay occurs in data distribution across the simulation systems.
Hereinafter, a description will be given with reference to FIGS.
FIG. 12 is a configuration diagram illustrating a simulation apparatus that realizes a connection method of a plurality of simulation systems.
In the figure, simulators A1, A2, B1, and B2 repeatedly execute simulations at predetermined time step intervals, and the results of the simulation are used as other data with time stamps via simulator management means A and B. The data is transmitted to the simulator and the simulation system connection means, and the data with the time stamp transmitted from the other simulator and the simulation system connection means is received via the simulator management means A and B.

The simulator management means A controls data exchange between the simulators A1 and A2 and the simulation system connection means, and controls the time progress of the simulators A1 and A2 and the simulation system connection means.
The simulator management means B controls data exchange between the simulators B1 and B2 and the simulation system connection means, and controls time progress of the simulators B1 and B2 and the simulation system connection means.
The simulator management means A and B correspond to the basic software RTI in the HLA.

The simulation system connection unit is connected between the simulator management unit A and the simulator management unit B, and has the bridge function described above.
The simulators A1 and A2, the simulator management unit A, and the simulation system connection unit are connected to the network A, and the simulators B1 and B2, the simulator management unit B, and the simulation system connection unit are connected to the network B.

Simulator management means A manages simulators A1 and A2 and simulation system connection means, and simulator management means B manages simulators B1 and B2 and simulation system connection means.
That is, one simulation system is composed of the simulator management means A, the simulator A1, the simulator A2, and the simulation system connection means.
Similarly, another simulation system is composed of the simulator management means B, the simulator B1, the simulator B2, and the simulation system connection means.
Hereinafter, the identifier of A is assigned to the former simulation system, and the identifier of B is assigned to the latter simulation system.

FIG. 13 is a flowchart showing a processing procedure corresponding to one time advance of each simulator.
However, the time step is “1”. In the initial state, the time of each simulator is t, and each simulator has received all the data with a time stamp equal to or less than time t.

First, in step ST11, the simulator performs a simulation for one time based on the state at the time t and the data with the time stamp that has been received at the time t or less.
In addition, among simulation results for one time, a simulation result that may affect other simulators is transmitted as data with a time stamp.
Here, the data transmission destination is a simulator management unit that manages the simulator.
That is, in the case of the simulators A1 and A2, the data transmission destination is the simulator management means A, and in the case of the simulators B1 and B2, the data transmission destination is the simulator management means B.
Further, there is a restriction that the time stamp given to the data must be in the future from the current time of the simulator. This is a necessary condition for executing the entire simulation without contradiction.

Next, in step ST12, when the simulation at time t is completed, the simulator transmits a “time advance request to time t + 1” to the simulator management means managing itself.
At this time, the simulator makes a transition to the “time progress requesting” state. In this state, thereafter, the simulator cannot transmit data with a time stamp of time t + 1 or less.

Next, in step ST13, the simulator that has transitioned to the “time progress requesting” state receives data with a time stamp of time progress request destination time t + 1 or less from the simulator management means that manages itself. Receive.
When the delivery of data with a time stamp of time t + 1 or less to the managed simulator is completed, the simulator management means transmits “time progress permission” to the simulator.

Next, in step ST14, when the simulator receives “time progress permission” from the simulator management means managing itself, the simulator advances the logical time to time t + 1.
As a result, the simulator transits to a state where “time progress request is not being requested” and returns to the process of step ST11.
However, in step ST11, t is read as t + 1.

Here, the determination of whether or not the distribution of data with a time stamp of time t + 1 or less to the simulator being managed has been completed in the simulator management means is based on the current time of the simulator to be managed and the simulation system connection means. This can be done by referring to the following matters.
-Simulator and simulation system connection means that are not requesting time progress cannot transmit data with a time stamp that is less than or equal to the current time.
-The simulator and simulation system connection means that are requesting time progress cannot transmit data with a time stamp that is less than the time progress request destination time.

FIG. 14 is a flowchart showing a processing procedure corresponding to one time advance of the simulation system connecting means.
However, the time step is “1”. Further, as an initial state, the time of the simulation system connection unit is t, and the simulation system connection unit has received all data with a time stamp equal to or less than time t.

First, in step ST21, the simulation system connection means transfers the data received from the simulator management means A, B to the other simulator management means B, A. Unlike the simulator, no simulation is performed.
That is, if the data transmission source is the simulator management means A, the data is transferred to the simulator management means B, and if the data transmission source is the simulator management means B, the data is transferred to the simulator management means A.
Since the time stamp assigned to the data is less than or equal to the current time, the time stamp is rewritten so as to be larger than the current time in order to satisfy the above-described restrictions on the time stamp of the transmission data.

Next, in step ST22, when the data transfer is completed, the simulation system connection unit transmits a “time progress request to time t + 1” to all the simulator management units A and B.
At this time, the simulation system connection means shifts to a state of “time progress requesting”. In this state, thereafter, the simulation system connection unit cannot transmit data with a time stamp of time t + 1 or less.

Next, in step ST23, the simulation system connecting means that has transitioned to the "time progress requesting" state has time stamps of time t + 1 or less, which is the time progress request destination time, from each simulator management means A and B. Receive data.
When the simulator management means A and B complete the delivery of data with a time stamp of time t + 1 or less to the simulation system connection means, the simulator management means A and B transmit “time progress permission” to the simulation system connection means.

Next, in step ST24, when the simulation system connection unit receives “time progress permission” from each of the simulator management units A and B, it advances the logical time to time t + 1.
As a result, the simulation system connecting means transitions to a state in which “time progress request is not in progress” and returns to the process of step ST21.
However, in step ST21, t is read as t + 1.

FIG. 15 is an explanatory diagram showing an example of specific processing progress of the simulators A1, A2, B1, B2 and the simulation system connecting means.
FIG. 15 shows the situation at each time point (1) to (5) in order of wall clock time.
In FIG. 15, the vertical axis is the logical time, and the time advances downward.
On each time axis, the circles represent the current logical times of the simulators A1, A2, B1, B2 and the simulation system connection means. Moreover, the rounded arrow which touches each time-axis represents the time progress condition.

Here, the dashed arrow indicates that “time advancement to the time indicated by the arrow is being requested”, and the solid arrow indicates that “time advancement to the time indicated by the arrow is completed”.
Further, in FIG. 15, for example, “D (t + 1)” represents “data of time stamp t + 1”.
Hereinafter, a specific situation at each time point (1) to (5) will be described. However, in FIG. 15, the time steps are all common and “1”, and in the initial state, the logic times of the simulators A1, A2, B1, and B2 and the simulation system connecting means are “t”.

First, at time (1), simulators A1, A2, B1, and B2 perform simulation at time t, and simulator A1 transmits data D (t + 1) with time stamp t + 1 as data corresponding to the simulation result. And However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.
Thereafter, at time (2), the simulators A1 and A2 and the simulation system connection unit transmit a time progress request to the time t + 1 to the simulator management unit A, and the simulators B1 and B2 and the simulation system connection unit transmit the time t + 1 to the time t + 1. A time advance request is transmitted to the simulator management means B.
The simulator A2 and the simulation system connection unit receive the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A.

At time (2), the simulators A1, A2, B1, B2 and the simulation system connection means are in a state where they cannot transmit data with a time stamp of time t + 1 or less.
Therefore, regarding the simulators A1, A2, B1, B2 and the simulation system connection means, it can be determined that the delivery of data with a time stamp of time t + 1 or less has been completed. Time advance permission is issued from means A and B.

Therefore, at the time point (3), the simulators A1, A2, B1, B2 and the simulation system connection unit advance the logical time to the time t + 1.
Here, the simulation system connection means transmits the received data D (t + 1) to the simulator management means B. At this time, since the logical time of the simulation system connection means is t + 1, the data of the time stamp t + 1 is stored. Cannot send. Therefore, the time stamp is changed to, for example, t + 2 and transmitted.
In addition, although simulation is performed in the simulators A1, A2, B1, and B2, here, for simplicity, it is assumed that data corresponding to the simulation result is not transmitted.

Thereafter, at the time point (4), the simulators A1 and A2 and the simulation system connection unit transmit a time progress request to the time t + 2 to the simulator management unit A, and the simulators B1 and B2 and the simulation system connection unit transmit the time to the time t + 2. A time advance request is transmitted to the simulator management means B.
The simulators B1 and B2 receive the data D (t + 2) transmitted from the simulation system connection unit via the simulator management unit B.
At the stage of time (4), regarding the simulators A1, A2, B1, B2 and the simulation system connection means, it can be determined that the delivery of data with a time stamp of time t + 2 or less has been completed. As a stage, time advance permission is issued from each simulator management means A, B.
Therefore, at the time (5), the simulators A1, A2, B1, B2 and the simulation system connecting means advance the logical time to the time t + 2.

In the example of FIG. 15, as described above, the data with the time stamp t + 1 transmitted from the simulator A1 is distributed when the simulators B1 and B2 advance the logical time to t + 2.
The data with the time stamp t + 1 is originally data to be distributed when the logical time is advanced to t + 1, and a data distribution delay of one time occurs due to the intervention of the simulation system connection means.
If the data distribution is delayed in this way, the simulation result as a whole may become inaccurate, which is not preferable.

W. Braudaway and R. Little. "The High Level Architecture's Bridge Federate", In Procs. Of the Fall Simulation Interoperability Workshop, 97F-SIW-078, September 1997. J. Dingel, D. Garlan and C. Damon. "Bridging the HLA: Problems and Solutions", in Procs. Of 6th DSRT, pp.33-42 USA, October 2002

  Since the conventional simulation apparatus is configured as described above, a large-scale simulation system can be constructed by connecting a plurality of simulation systems. However, there has been a problem that a delay occurs in data distribution across the simulation system, and the simulation result as a whole may become inaccurate.

  The present invention has been made to solve the above-described problems, and even when data is distributed across simulation systems, a simulation apparatus capable of preventing a delay in data distribution and obtaining an accurate simulation result. The purpose is to obtain.

  In the simulation apparatus according to the present invention, when the simulator management means receives time advance requests from all simulators connected to the same network as the self and the network connection means, the simulator and the network connection means permit time advancement. When the network connection means receives the data distributed from the simulator management means connected to a certain network, the data is immediately transferred to the simulator management means connected to another network, and then the time progress request is issued. The information is transmitted to a plurality of simulator management means.

  According to this invention, when the simulator management means receives time advance requests from all the simulators connected to the same network as itself and the network connection means, the simulator and the network connection means allow time advance of the network and the network connection means. When the connection means receives the data distributed from the simulator management means connected to a certain network, the data is immediately transferred to the simulator management means connected to another network, and then a time progress request is sent to a plurality of times. Since it is configured to be transmitted to the simulator management means, even when data is distributed to a simulator connected to another network, there is an effect that an accurate simulation result can be obtained by preventing a delay in data distribution. is there.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a simulation apparatus according to Embodiment 1 of the present invention. In the figure, simulators A1, A2, B1, and B2 repeatedly execute simulations at predetermined time step intervals. The result is sent as time-stamped data via simulator management means A and B to other simulators and simulation system connections, and time-stamped data sent from other simulators and simulation system connections is managed by the simulator. Received via means A and B.

Simulator A1, A2, simulator management part A, and simulation system connection part 3 are connected to network A, and simulation system A is composed of simulators A1, A2, simulator management part A, simulation system connection part 3, and network A. ing.
Simulator B1, B2, simulator management part B, and simulation system connection part 3 are connected to network B, and simulation system B is comprised from simulator B1, B2, simulator management part B, simulation system connection part 3, and network B. ing.

The simulator management unit A includes a data distribution unit 1 and a time progress management unit 2, and manages the time progress of the simulators A1 and A2 and the simulation system connection unit 3 connected to the network A. For example, the simulator A1 Is transmitted to the simulator A2 and the simulation system connection unit 3, and when the time advance request is received from the simulators A1 and A2 and the simulation system connection unit 3, the simulators A1 and A2 and the simulation system connection unit 3 Perform processing such as permitting the time progression of
For example, the data distribution unit 1 of the simulator management unit A distributes data transmitted from the simulator A1 to the simulator A2 and the simulation system connection unit 3, and distributes data transferred from the simulation system connection unit 3 to the simulators A1 and A2. Perform the process.
The time progress management unit 2 of the simulator management unit A performs processing for managing the time progress of the simulators A1 and A2 and the simulation system connection unit 3.

The simulator management unit B includes a data distribution unit 1 and a time progress management unit 2, and manages the time progress of the simulators B1 and B2 and the simulation system connection unit 3 connected to the network B. For example, the simulator B1 Is transmitted to the simulator B2 and the simulation system connection unit 3, and when the time advance request is received from the simulators B1, B2 and the simulation system connection unit 3, the simulators B1, B2 and the simulation system connection unit 3 Perform processing such as permitting the time progression of
For example, the data distribution unit 1 of the simulator management unit B distributes data transmitted from the simulator B1 to the simulator B2 and the simulation system connection unit 3, and distributes data transferred from the simulation system connection unit 3 to the simulators B1 and B2. Perform the process.
The time progress management unit 2 of the simulator management unit B performs processing for managing the time progress of the simulators B1 and B2 and the simulation system connection unit 3.
The simulator management units A and B constitute simulator management means.

The simulation system connection unit 3 includes a time management unit 4 and a data transfer unit 5. For example, when receiving data distributed from the simulator management unit A, the simulation system connection unit 3 immediately transfers the data to the simulator management unit B, After confirming that the simulators A1, A2, B1, and B2 are in the “time progress requesting” state, processing such as transmitting a time progress request to the simulator management units A and B is performed.
The time management unit 4 can confirm that the simulators A1, A2, B1, and B2 are requesting the time progress by referring to the time progress information held in the time progress management unit 2 of the simulator management units A and B. At this time, a time progress request within a range not exceeding the time advance request destination time of the simulators A1, A2, B1, and B2 is transmitted to the simulator management units A and B, and the time progression is permitted by the simulator management units A and B. Then, the logic time of the simulation system connection unit 3 is advanced to the requested time.
When the data transfer unit 5 receives the data distributed from the simulator management unit A, the data transfer unit 5 immediately transfers the data to the simulator management unit B. When the data transfer unit 5 receives the data distributed from the simulator management unit B, the data transfer unit 5 transfers the data to the simulator management unit A. Perform processing such as transferring immediately.
The simulation system connection unit 3 constitutes a network connection unit.

Next, the operation will be described.
FIG. 2 is a flowchart showing a processing procedure corresponding to one time advance of the simulation system connection unit 3.
First, in step ST1, the data transfer unit 5 of the simulation system connection unit 3 relays data between the simulation systems A and B.
That is, when data is received from the simulator management unit A, the data is promptly transferred to the simulator management unit B.
When data is received from the simulator management unit B, the data is promptly transferred to the simulator management unit A.

Next, in step ST2, the time management unit 4 of the simulation system connection unit 3 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B and refers to the simulators A1, A2, and B1. , B2 confirms whether or not the time progress request is in progress, and when all of the simulators A1, A2, B1, and B2 are in time progress request, the time progress requests of the simulators A1, A2, B1, and B2 at that time A time advance request within a range not exceeding the previous time is transmitted to the simulator management units A and B.
At this time, the time management unit 4 of the simulation system connection unit 3 shifts to a state of “time progress requesting”.

The time progression management unit 2 of the simulator management unit A permits the time progression of the simulators A1 and A2 and the simulation system connection unit 3 when the time progression request is received from the simulators A1 and A2 and the simulation system connection unit 3.
Here, the time progression is permitted because the simulator and simulation system connection unit that can guarantee that the data with the past time stamp is not received after the time progression, that is, “time progression request destination time is These simulators and simulation system connection unit 3 are limited to simulators and simulation system connection units that are below the time advance request destination time.
Further, the time progression management unit 2 of the simulator management unit B permits the time progression of the simulators B1 and B2 and the simulation system connection unit 3 when the time progression request is received from the simulators B1 and B2 and the simulation system connection unit 3. .
Here, the time progression is permitted because the simulator and simulation system connection unit that can guarantee that the data with the past time stamp is not received after the time progression, that is, “time progression request destination time is These simulators and simulation system connection unit 3 are limited to simulators and simulation system connection units that are below the time advance request destination time.

Next, in step ST3, when the time management unit 4 of the simulation system connection unit 3 receives time advance permission from the simulator management units A and B, it advances the logical time to the requested time.
At this time, the simulation system connection unit 3 transits to a state where “time progress request is not in progress”.

Hereinafter, data distribution across the simulation systems A and B will be described.
For example, the data transmitted from the simulator A1 is promptly received by the data transfer unit 5 of the simulation system connection unit 3 via the simulator management unit A that manages the simulator A1.
The data transfer unit 5 of the simulation system connection unit 3 promptly transfers the received data to the simulator management unit B which is a simulator management unit other than the transmission source.
When the data distribution unit 1 of the simulator management unit B receives the data transferred from the simulation system connection unit 3, the data distribution unit 1 transmits the data to the simulators B1 and B2 at a time corresponding to the time stamp given to the data. To do.
Therefore, when data passes through the simulation system connection unit 3, there is no problem that a delay of one time occurs.

In addition, as described above, the time management unit 2 of the simulator management units A and B performs a “time progress request” after the state of all simulators to be managed and the simulation system connection unit 3 becomes “time progress requesting”. The time advance permission is transmitted to the simulator and the simulation system connection unit whose previous time is equal to or less than the time advance request destination time of the other simulator and simulation system connection unit 3 belonging to the same simulation system.
On the other hand, the time progress request destination time of the simulation system connection unit 3 is set so as not to exceed the time progress request destination time of all the simulators. The time progress permission is given to the simulator and the simulation system connection section which are below the minimum time.

Therefore, it is assured that “simultaneous delivery of data with a time stamp equal to or less than the time advance request destination time has been completed” for the simulator to which time advance permission is given. That is, the phenomenon that the simulator receives data with a past time stamp cannot occur, so that inconsistency does not occur in the simulation.
Therefore, by using the simulation apparatus of FIG. 1, it is possible to perform distribution of data with a time stamp across a plurality of simulation systems A and B so as not to cause inconsistency and to prevent delay. it can.

Hereinafter, a case where all simulator time steps are the same will be considered.
In this case, the operations of the time management unit 4 of the simulation system connection unit 3 and the time progress management unit 2 of the simulator management units A and B can be embodied as follows.
The time management unit 4 of the simulation system connection unit 3 transmits a time progress request to a future time by the same time step as that of the simulators A1, A2, B1, and B2 at the time progress request.
The time progress management unit 2 of the simulator management units A and B connects all the simulators and simulation systems to be managed after all the simulators to be managed and the simulation system connection unit 3 are requesting time progress when permitting time progress. A time advance permission is transmitted to the unit 3.

FIG. 3 is an explanatory diagram showing an example of progress of specific processing of all simulators and the simulation system connection unit 3 when the time steps of all simulators are the same.
FIG. 3 shows the situation at each time point (1) to (4) in order of wall clock time.
However, in FIG. 3, the time steps of the simulators A1, A2, B1, and B2 are all “1”, and in the initial state, the logic times of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 are “ Let t ″. In this case, as described above, the time step of the simulation system connection unit 3 is also fixed to “1”.

First, at time (1), simulators A1, A2, B1, and B2 perform simulation at time t, and simulator A1 transmits data D (t + 1) with time stamp t + 1 as data corresponding to the simulation result. And However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.
Thereafter, at time point (2), simulators A1 and A2 transmit a time advance request to time t + 1 to simulator management unit A, and simulators B1 and B2 transmit a time advance request to time t + 1 to simulator management unit B. To do.
At this time, the simulator A2 receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A.
The data transfer unit 5 of the simulation system connection unit 3 also receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A, and immediately transfers the data D (t + 1) to the simulator management unit B. To do.

In the situation at time (2), all the simulators A1, A2, B1, and B2 are in the “time progress requesting” state, and the time progress information of the simulators A1 and A2 is the time progress management unit 2 of the simulator management unit A. The time progression information of the simulators B1 and B2 is held in the time progression management unit 2 of the simulator management unit B.
Therefore, the time management unit 4 of the simulation system connection unit 3 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and all the simulators are in a “time progress requesting” state. Make sure that

Next, at time (3), when the time management unit 4 of the simulation system connection unit 3 confirms that all the simulators are in the “time progress requesting” state as described above, the time to the time t + 1 A progress request is transmitted to the simulator management units A and B.
The simulators B1 and B2 receive the data D (t + 1) transferred by the simulation system connection unit 3 via the simulator management unit B.
In the situation at time point (3), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 are in the “time progress requesting” state, so the time progress management unit 2 of the simulator management unit A The progress permission is transmitted to the simulators A1 and A2 and the simulation system connection unit 3, and the time progress management unit 2 of the simulator management unit B transmits the time progress permission to the simulators B1 and B2 and the simulation system connection unit 3.

Here, the reason why the time advance permission may be transmitted as described above will be described.
First, in the situation at time point (3), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 are in a state where data with a time stamp of time t + 1 or less cannot be transmitted.
Therefore, with respect to the simulators A1, A2, B1, B2 and the simulation system connection unit 3, it can be determined that the delivery of data with a time stamp of time t + 1 or less has been completed.
Therefore, even if the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 proceed at time t + 1, the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 have past data with time stamps. May not be allowed, the time advance permission to time t + 1 may be issued.

For this reason, at the time point (4), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 advance the logical time to t + 1.
In the example of FIG. 3, as described above, the data of the time stamp t + 1 transmitted from the simulator A1 is distributed when the logical time advances to t + 1 in the simulators B1 and B2, and the data is distributed across the simulation systems. It can be seen that there is no delay in FIG.

  As is apparent from the above, according to the first embodiment, when the simulator management units A and B receive time progress requests from all the simulators connected to the same network as themselves and the simulation system connection unit 3. Thus, all simulators A1, A2, B1, B2 and the simulation system connection unit 3 are allowed to proceed with time, and the simulation system connection unit 3 is, for example, data distributed from the simulator management unit A connected to the network A. , The data is immediately transferred to the simulator management unit B connected to the network B, and after confirming that the simulators A1, A2, B1, B2 are in the “time progress requesting” state, Since it is configured to send the time progress request to the simulator managers A and B, the network Even when performing the simulator B1, B2 connected to the B data delivery, to prevent the delay of data delivery, the effect that it is possible to obtain accurate simulation results.

In the first embodiment, an example in which the number of simulators constituting each simulation system is two has been described. However, the present invention can be similarly applied even when the number of simulators is three or more.
In the first embodiment, the case where two simulation systems A and B are connected has been described. However, even when three or more simulation systems are connected, different simulation systems provide a single simulation system connection unit 3. The same can be applied by configuring the simulation apparatus so as to exchange data.
FIG. 4 shows a simulation apparatus in which one simulation system connection unit 3 connects three simulation systems A, B, and C, and the simulators A1, A2, B1, B2, C1, and C2 perform simulation while exchanging data. FIG.
In this case, when two simulation systems that exchange data are taken up, these relations are exactly the same as those of the simulation apparatus of FIG.

Finally, the implementation policy of the first embodiment using HLA will be described.
When using the HLA, the simulators A and B (corresponding to RTI in HLA) treat the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 as equivalent “federate”.
According to the HLA standard, data is classified into TSO (Time Stamp Order) and non-data (called RO (Receive Order)).
The TSO data has a time stamp, and when each federate receives the TSO data, it must be received in the order of the time stamp. Further, TSO data with a past time stamp cannot be received because the simulation is executed without contradiction.

Each federation is classified as time-regulating and not.
The time-regulating federation is a federation capable of transmitting TSO data.
Each federation is classified into a time-constrained type and a non-timed type.
The time-constrained federation is a federation capable of receiving TSO data.
When the time-regulating fedrate transmits TSO data, the federation that is not time-constrained is received as RO data.

As described above, the federation has a restriction that it cannot receive TSO data with a past time stamp. In order to satisfy this restriction, the time progression of the federation that receives the TSO data is controlled.
In other words, it can be expressed as “time-regulated federation controls time progression of other federations” and “time-constrained federation has time progression controlled by other federations”.
Normally, when simulating a certain system accurately, it is necessary to proceed with the simulation while synchronizing the time of each simulator that simulates the components of the system. In this case, each simulator is time-regulated and time-constrained. What is necessary is just to set.

Since the simulation system connection unit 3 in the first embodiment needs to have the ability to “control the time progression of other federations” in order to synchronize the time between simulators belonging to different simulation systems, it is referred to as time-regulating. There must be.
On the other hand, if time-constrained, the reception of certain TSO data is performed when the simulation system connection unit 3 advances the time until the time stamp is reached or until the time stamp is exceeded (TSO data is saved). (To ensure reception in order of time stamp).
In that case, the delay at the simulation system connection unit 3 in data distribution as described in “Problems to be Solved by the Invention” is unavoidable.
Conversely, if it is not time-constrained, data can be received promptly regardless of the time stamp (in this case, all data is received as RO data).
Therefore, the simulation system connection unit 3 is set as not being time-constrained.

  As described above, by setting the simulation system connection unit 3 to be time-regulating and not time-constrained, the data transmitted by each simulator can be quickly received regardless of the time stamp given to the data. (Because it is not time-constrained), and further, it can be quickly transmitted as TSO data (because it is time-regulating).

On the other hand, in order to realize the first embodiment, the simulation system connection unit 3 needs to refer to the time progress information held in the time progress management unit 2 (RTI) of the simulator management units A and B. .
This can be implemented by using a MOM (Management Object Model) function in the HLA. Alternatively, APIs related to HLA such as Query GLT and Query LITS (Application Programmer's Interface) may be used (when these APIs are used in each federation, the minimum time at which TSO data can be received, etc.) This minimum time changes as the time progress of each federate changes).
The RTI also has the functions of the simulator management units A and B described in this embodiment.
Therefore, it is possible to mount the simulation apparatus described in the first embodiment using the HLA.

Embodiment 2. FIG.
In the first embodiment, the time steps of the simulators A1, A2, B1, and B2 are all the same. However, in the second embodiment, the time steps of all the simulators A1, A2, B1, and B2 are shown. What is a natural number times the minimum time step will be described.
FIG. 5 shows an example of specific processing progress of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 when the time steps of the simulators A1, A2, B1, and B2 are natural number times the minimum time step. It is explanatory drawing shown.

The configuration of the simulation apparatus is the same as in FIG.
However, when the time management unit 4 of the simulation system connection unit 3 requests time advancement, the time management unit 4 transmits a request for time advancement to a future time by the minimum time step to the simulator management units A and B.
When the time progress management unit 2 of the simulator management units A and B permits time progress, the management target simulator and the simulation system connection unit 3 are in a state of requesting time progress, and then the management target simulator and simulation system The minimum time of the time advance request destination time of the connection unit 3 is obtained, and the time advance permission is transmitted to the simulator and simulation system connection unit 3 that satisfy the condition that the time advance request destination time is equal to the minimum time.
Hereinafter, a specific example of progress of processing will be described.

In FIG. 5, it is assumed that the minimum time step is “1”, the time steps of the simulators A1 and B1 are “1”, and the time steps of the simulators A2 and B2 are “2”.
In this case, the time step of the simulation system connection unit 3 is fixed at “1” which is the minimum time step.
In the initial state, it is assumed that the logic times of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 are “t”.

First, at time (1), simulators A1, A2, B1, and B2 perform simulation at time t, and simulator A1 transmits data D (t + 1) with time stamp t + 1 as data corresponding to the simulation result. And However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.
Thereafter, at time point (2), simulators A1 and B1 transmit a time advance request to the future for time step “1”, which is a unique time step, to simulator management units A and B, respectively. Then, a time advance request for the time step “2”, which is a unique time step, is transmitted to the simulator management units A and B, respectively.

At this time, the simulator A2 receives the data D (t + 1) via the simulator management unit A.
Further, the simulation system connection unit 3 also receives the data D (t + 1) via the simulator management unit A, and immediately transfers the data D (t + 1) to the simulator management unit B.
In the situation at time (2), all the simulators A1, A2, B1, and B2 are in the “time progress requesting” state, and the time progress information of the simulators A1 and A2 is the time progress management unit 2 of the simulator management unit A. The time progression information of the simulators B1 and B2 is held in the time progression management unit 2 of the simulator management unit B.
Therefore, the time management unit 4 of the simulation system connection unit 3 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and all the simulators A1, A2, B1, and B2 Confirm that the time progress request is in progress.

Next, at time (3), when the time management unit 4 of the simulation system connection unit 3 confirms that all the simulators are in the “time progress requesting” state as described above, the future will be the minimum time step. Request to advance to time, that is, a request to advance to time t + 1 is transmitted to the simulator managers A and B.
The simulators B1 and B2 receive the data D (t + 1) transferred by the simulation system connection unit 3 via the simulator management unit B.
In the situation at the time point (3), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 are in the “time progress requesting” state, so the time progress management unit 2 of the simulator management units A, B However, the minimum time of the time advance request destination time of the simulator to be managed and the simulation system connection unit 3 is obtained (specifically, t + 1 is obtained for both the simulator management units A and B).
The time progress management unit 2 of the simulator management units A and B transmits time progress permission to the simulator to be managed and the simulation system connection unit 3 that satisfy the condition that the time progress request destination time is equal to t + 1.

Here, the reason why the time advance permission may be transmitted as described above will be described.
First, in the situation at time point (3), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 transmit data with a time stamp of t + 1 or less, which is the minimum time of the time advance request destination time. It is in a state that can not be.
Therefore, with respect to the simulators A1, A2, B1, B2 and the simulation system connection unit 3, it can be determined that the delivery of data with a time stamp of time t + 1 or less has been completed.
Therefore, even if the simulator / simulation system connection unit 3 whose time advance request destination time is equal to t + 1 progresses at time t + 1 as requested, the simulators A1, A2, B1, B2 or the simulation system connection unit 3 Since a situation in which data with a past time stamp is received cannot occur, time advance permission to time t + 1 may be transmitted.
For this reason, at the time (4), the simulators A1 and B1 and the simulation system connection unit 3 advance the time to the logical time t + 1.

Next, at time (5), the simulators A1 and B1 perform simulation. However, here, for simplification of explanation, it is assumed that data corresponding to the simulation result is not transmitted.
Thereafter, the simulators A1 and B1 transmit a time advance request for time t + 2 to the simulator management units A and B.
In the situation at the time point (5), all the simulators A1, A2, B1, B2 are in the “time progress requesting” state, so the simulation system connection unit 3 itself goes to the time t + 2 at the time point (6). Is sent to the simulator managers A and B.

  At time (6), after the simulation system connection unit 3 transmits a time progress request for time t + 2 to the simulator management units A and B, all the simulators A1, A2, B1, B2 and the simulation are transmitted from the simulator management units A and B. When time advance permission is issued to the system connection unit 3, the simulators A1, A2, B1, B2 and the simulation system connection unit 3 advance the logical time to t + 2.

In the example of FIG. 5, as described above, the data of the time stamp t + 1 transmitted from the simulator A1 progresses when the logical time advances to t + 1 in the simulators B1 and B2, or the logical time advances beyond t + 1. It can be seen that there is no delay in data distribution across simulation systems.
As described above, when the time step of each simulator is expressed by a natural number multiple of the minimum time step with respect to the predetermined minimum time step, multiple simulations that do not cause data delay at a relatively small processing cost The system can be connected.

Embodiment 3 FIG.
In the first embodiment, the case where the time steps of all the simulators A1, A2, B1, and B2 are the same is shown. However, in the third embodiment, the time steps of the simulators A1, A2, B1, and B2 are as follows. A case where no restriction is particularly provided will be described.
FIG. 6 is a diagram illustrating an example of progress of specific processing of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 when there are no particular restrictions on the time steps of the simulators A1, A2, B1, and B2. FIG.

The configuration of the simulation apparatus is the same as in FIG.
However, the time management unit 4 of the simulation system connection unit 3 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and the states of all the simulators A1, A2, B1, and B2 When the time progress request is in progress, the minimum value of the time progress request destination time is obtained, and further, the minimum value of the time progress request destination time minimum value over each simulator management unit A, B is obtained, and the simulation is performed. A time advance request is transmitted to the simulator management units A and B as the next time advance request destination time of the system connection unit 3 itself.
When the time progress management unit 2 of the simulator management units A and B permits time progress, the management target simulator and the simulation system connection unit 3 are in a state of requesting time progress, and then the management target simulator and simulation system The minimum time of the time advance request destination time of the connection unit 3 is obtained, and the time advance permission is transmitted to the simulator and simulation system connection unit 3 that satisfy the condition that the time advance request destination time is equal to the minimum time.
Hereinafter, a specific example of progress of processing will be described.

In FIG. 6, it is assumed that the time steps of the simulators A1 and B1 are “a” and the time steps of the simulators A2 and B2 are “b”.
In the initial state, it is assumed that the logic times of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 are “t”.

First, at time (1), simulators A1, A2, B1, and B2 perform simulation at time t, and simulator A1 transmits data D (t + a) with time stamp t + a as data corresponding to the simulation result. And However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.
Thereafter, at time point (2), simulators A1 and B1 transmit time advance requests to the future for time step “a”, which is a unique time step, to simulator management units A and B, respectively. , A time advance request for the time step “b”, which is a unique time step, is transmitted to the simulator management units A and B, respectively.

At this time, the simulator A2 receives the data D (t + a) via the simulator management unit A.
The data transfer unit 5 of the simulation system connection unit 3 also receives the data D (t + a) via the simulator management unit A, and transfers the data D (t + a) to the simulator management unit B immediately.
In the situation at time (2), all the simulators A1, A2, B1, and B2 are in the “time progress requesting” state, and the time progress information of the simulators A1 and A2 is the time progress management unit 2 of the simulator management unit A. The time progression information of the simulators B1 and B2 is held in the time progression management unit 2 of the simulator management unit B.
Therefore, the time management unit 4 of the simulation system connection unit 3 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and all the simulators A1, A2, B1, and B2 Confirm that the time progress request is in progress.

When the time management unit 4 of the simulation system connection unit 3 confirms that all simulators are in the “time progress requesting” state as described above, the simulator management unit 4 determines the time progress request destination time of the simulator. The minimum value of the time advance request destination time of the simulator in parts A and B is obtained.
In the case of FIG. 6B, the minimum value of the time progress request destination time is min (t + a, t + b) = t + a in both the simulator management units A and B.
Thereafter, the minimum value of the time progress request destination time minimum value over the simulator management units A and B is obtained and set as the next time progress request destination time of the simulation system connection unit 3 itself.
In the case of FIG. 6 (2), the minimum value of the time progress request destination time minimum values over the simulator management units A and B is min (t + a, t + a) = t + a.

Therefore, in the situation at the time point (3), the time management unit 4 of the simulation system connection unit 3 transmits a time progress request for time t + a to the simulator management units A and B.
The simulators B1 and B2 receive the data D (t + a) transferred by the simulation system connection unit 3 via the simulator management unit B.
In the situation at the time point (3), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 are in the “time progress requesting” state, so the time progress management unit 2 of the simulator management units A, B However, the minimum time of the time advance request destination time of the simulator to be managed and the simulation system connection unit 3 is obtained (specifically, t + a is obtained for both the simulator management units A and B).
The time progress management unit 2 of the simulator management units A and B transmits time progress permission to the simulator to be managed and the simulation system connection unit 3 that satisfy the condition that the time progress request destination time is equal to t + a.

Here, the reason why the time advance permission may be transmitted as described above will be described.
First, in the situation of time point (3), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 transmit data with a time stamp equal to or less than t + a which is the minimum time of the time advance request destination time. It is in a state that can not be.
Therefore, with respect to the simulators A1, A2, B1, B2 and the simulation system connection unit 3, it can be determined that the delivery of data with a time stamp of time t + a or less has been completed.
Therefore, even if the simulator and simulation system connection unit 3 whose time advance request destination time is equal to t + a advances to the time t + a as requested, the simulators A1, A2, B1, B2, or the simulation system connection unit 3 Since a situation in which data with a past time stamp is received cannot occur, a time advance permission to time t + a may be transmitted.
For this reason, at the time (4), the simulators A1 and B1 and the simulation system connection unit 3 advance the logical time to t + a.

In the example of FIG. 6, as described above, the data of the time stamp t + a transmitted from the simulator A1 progresses when the logical time advances to t + a in the simulators B1 and B2, or the logical time advances beyond t + a. It can be seen that there is no delay in data distribution across simulation systems.
As described above, even when there is no restriction on the time step of each simulator, it is possible to connect a plurality of simulation systems so that no data delay occurs.

Embodiment 4 FIG.
FIG. 7 is a block diagram showing a simulation apparatus according to Embodiment 4 of the present invention. In the figure, the same reference numerals as those in FIG.
Simulators C1 and C2, simulator management unit C, and simulation system connection unit 3-2 are connected to network C, and simulation systems are connected from simulators C1 and C2, simulator management unit C, simulation system connection unit 3-2, and network C. C is configured.

The simulator management unit C includes a data distribution unit 1 and a time progress management unit 2, and manages the time progress of the simulators C1 and C2 and the simulation system connection unit 3-2 connected to the network C. When the data transmitted from the simulator C1 is distributed to the simulator C2 and the simulation system connection unit 3-2 and when the time progress request is received from the simulators C1 and C2 and the simulation system connection unit 3-2, the simulators C1 and C2 And the process of permitting the time progress of the simulation system connection part 3-2 is implemented.
The data distribution unit 1 of the simulator management unit C distributes, for example, data transmitted from the simulator C1 to the simulator C2 and the simulation system connection unit 3-2, and transmits the data transferred from the simulation system connection unit 3-2 to the simulators C1 and C2. Perform processing such as delivering to.
The time progress management unit 2 of the simulator management unit C performs processing for managing the time progress of the simulators C1 and C2 and the simulation system connection unit 3-2.
The simulator management unit C constitutes simulator management means.

The simulation system connection unit 3-1 includes a time management unit 4 and a data transfer unit 5. For example, when data distributed from the simulator management unit A is received, the data is immediately transferred to the simulator management unit B. Then, after confirming that all the simulators are in the “time progress requesting” state, processing such as transmitting time progress requests to the simulator management units A and B is performed.
The time management unit 4 of the simulation system connection unit 3-1 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and the simulators A1, A2, B1, and B2 request time progress. When it is confirmed that it is in the middle, a “responsible range time progress request message” is transmitted. The assigned range time progress request message is a message indicating that, for each simulation system connection unit, all simulators included in the simulation system to which the simulation system connection unit belongs are in time progress request. When the transmission of the assigned range time progress request message and the reception of the assigned range time progress request message from all simulation system connections other than yourself are completed, it is possible to determine that all simulators are in the “time progress requesting” state. it can. If it is determined that all the simulators are in the “time progress requesting” state in this way, the time management unit 4 of the simulation system connection unit 3-1 does not exceed the time progress request destination time of all the simulators. Is transmitted to the simulator managers A and B, and when the simulator managers A and B allow the time progression, the logic time of the simulation system connection unit 3-1 is advanced to the requested time.
For example, when the data transfer unit 5 of the simulation system connection unit 3-1 receives data distributed from the simulator management unit A, the data transfer unit 5 performs processing such as immediately transferring the data to the simulator management unit B.
The simulation system connection unit 3-2 includes a time management unit 4 and a data transfer unit 5. For example, when data distributed from the simulator management unit B is received, the data is immediately transferred to the simulator management unit C. Then, after confirming that all the simulators are in the “time progress requesting” state, processing such as transmitting the time progress request to the simulator management units B and C is performed.
The time management unit 4 of the simulation system connection unit 3-2 refers to the time progress information held in the time progress management unit 2 of the simulator management units B and C, and the simulators B1, B2, C1, and C2 request time progress. When it is confirmed that it is in the middle, the assigned range time progress request message is transmitted. When it is determined that all simulators have been in the “time progress requesting” state after the transmission of the assigned range time progress request message and the reception of the assigned range time progress request message from all other simulation system connections are complete. The time management unit 4 of the simulation system connection unit 3-2 transmits a time progress request within a range not exceeding the time progress request destination time of all simulators to the simulator management units B and C, and the simulator management units B and C When the time advance is permitted by the above, the logical time of the simulation system connection unit 3-2 is advanced to the requested time.
For example, when the data transfer unit 5 of the simulation system connection unit 3-2 receives data distributed from the simulator management unit B, the data transfer unit 5 performs processing such as immediately transferring the data to the simulator management unit C.
Each of the simulation system connection units 3-1 and 3-2 constitutes a network connection unit.

Next, the operation will be described.
Hereinafter, data distribution across the simulation systems A, B, and C will be described.
For example, the data transmitted from the simulator A1 is promptly received by the data transfer unit 5 of the simulation system connection unit 3-1 via the simulator management unit A that manages the simulator A1.
The data transfer unit 5 of the simulation system connection unit 3-1 promptly transfers the received data to the simulator management unit B which is a simulator management unit other than the transmission source. When the simulator management unit B receives the data, it immediately transmits the data to the simulation system connection unit 3-2.
The data transfer unit 5 of the simulation system connection unit 3-2 promptly transfers the received data to the simulator management unit C.

When the data distribution unit 1 of the simulator management unit B receives the data transferred from the simulation system connection unit 3-1, the data is transferred to the simulator B1, at a time corresponding to the time stamp given to the data. Send to B2.
Further, when the data distribution unit 1 of the simulator management unit C receives the data transferred from the simulation system connection unit 3-2, the data is transmitted to the simulator C1 at a time corresponding to the time stamp given to the data. , C2.
Therefore, there is no problem that a delay occurs when data passes through the simulation system connection units 3-1 and 3-2.

In addition, the time progress management unit 2 of the simulator management units A, B, and C, after the state of all simulators to be managed and the simulation system connection unit becomes “time progress requesting”, the “time progress request destination time is The time advance permission is transmitted to the simulator and the simulation system connection unit which are below the time advance request destination time of other simulators and simulation system connection units belonging to the same simulation system.
On the other hand, the time advance request destination times of the simulation system connection units 3-1 and 3-2 are set so as not to exceed the time advance request destination times of all the simulators. The time progress permission is given to the simulator and the simulation system connection section, which is equal to or less than the minimum time advance request destination time of the simulator.

Therefore, it is assured that “simultaneous delivery of data with a time stamp equal to or less than the time advance request destination time has been completed” for the simulator to which time advance permission is given. That is, the phenomenon that the simulator receives data with a past time stamp cannot occur, so that inconsistency does not occur in the simulation.
Therefore, by using the simulation apparatus of FIG. 7, the delivery of data with time stamps across a plurality of simulation systems A, B, and C is performed so that no inconsistency occurs and no delay occurs. be able to.

Hereinafter, a case where all simulator time steps are the same will be considered.
In this case, the operations of the time management unit 4 of the simulation system connection units 3-1 and 3-2 and the time progress management unit 2 of the simulator management units A, B, and C can be embodied as follows.
The time management unit 4 of the simulation system connection units 3-1 and 3-2 requests a time advance to a future time by the same time step as the simulators A 1, A 2, B 1, B 2, C 1, and C 2 at the time advance request. Send.
The time management unit 2 of the simulator management units A, B, and C allows all the simulators and simulation systems to be managed after all the simulators to be managed and the simulation system connection unit are requesting the time progress when permitting time progress. A time advance permission is transmitted to the connection unit.

FIG. 8 is an explanatory diagram showing an example of progress of specific processing of all simulators and simulation system connection units 3-1 and 3-2 when the time steps of all simulators are the same.
However, in FIG. 8, the time steps of the simulators A1, A2, B1, B2, C1, and C2 are all “1”, and in the initial state, the simulators A1, A2, B1, B2, C1, C2, and the simulation system It is assumed that the logical time of the connection units 3-1 and 3-2 is “t”. In this case, as described above, the time steps of the simulation system connection units 3-1 and 3-2 are also fixed to “1”.
“Msg” represents the assigned range time progress request message.
In FIG. 8, descriptions regarding the simulators A2, B2, and C2 are omitted for simplicity of explanation.

First, at time point (1), simulators A1, A2, B1, B2, C1, and C2 perform simulation at time t, and simulator A1 has data D (t + 1) with time stamp t + 1 as data corresponding to the simulation result. Shall be sent. However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.
Thereafter, at time point (2), simulators A1 and A2 transmit a time advance request to time t + 1 to simulator management unit A, and simulators B1 and B2 transmit a time advance request to time t + 1 to simulator management unit B. Then, the simulators C1 and C2 transmit a time advance request to time t + 1 to the simulator management unit C.
At this time, the simulator A2 receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A.
The data transfer unit 5 of the simulation system connection unit 3-1 receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A, and promptly receives the data D (t + 1) from the simulator management unit B. Forward to.

In the situation at time (2), all the simulators A1, A2, B1, B2, C1, and C2 are in the “time progress requesting” state, and the time progress information of the simulators A1 and A2 is the time of the simulator management unit A. Held in the progress management unit 2, the time progress information of the simulators B1 and B2 is held in the time progress management unit 2 of the simulator management unit B, and the time progress information of the simulators C1 and C2 is stored in the time progress management unit 2 of the simulator management unit C Is held in.
Therefore, the time management unit 4 of the simulation system connection unit 3-1 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and the simulators A1, A2, B1, and B2 Confirm that the time progress request is in progress.
The time management unit 4 of the simulation system connection unit 3-2 refers to the time progress information held in the time progress management unit 2 of the simulator management units B and C, and the simulators B1, B2, C1, and C2 Confirm that the time progress request is in progress.

When the time management unit 4 of the simulation system connection unit 3-1 confirms that the simulators A 1, A 2, B 1, and B 2 are in the “time progress requesting” state in the situation of the time point (3), the assigned range time progress Send a request message.
When the time management unit 4 of the simulation system connection unit 3-2 confirms that the simulators B1, B2, C1, and C2 are in the “time progress requesting” state, the time management unit 4 also transmits an assigned range time progress request message.
The simulators B1 and B2 receive the data D (t + 1) transferred by the simulation system connection unit 3-1 via the simulator management unit B.
The time management unit 4 of the simulation system connection unit 3-2 also receives the data D (t + 1) transferred by the simulation system connection unit 3-1, via the simulator management unit B, and promptly receives the data D (t + 1). To the simulator management unit C.

At the next time point (4), the simulators C1 and C2 receive the data D (t + 1) transferred by the simulation system connection unit 3-2 via the simulator management unit C.
The time management unit 4 of the simulation system connection unit 3-1 receives the assigned range time progress request message transmitted from the simulation system connection unit 3-2 via the simulator management unit B.
In addition, the time management unit 4 of the simulation system connection unit 3-2 also receives the assigned range time progress request message transmitted from the simulation system connection unit 3-1 via the simulator management unit B.
Therefore, in the situation of the time point (4), the time management unit 4 of the simulation system connection units 3-1 and 3-2 transmits the assigned range time progress request message and is in charge from all simulation system connection units other than itself. The reception of the range time progress request message has been completed.
Therefore, at time (4), the time management unit 4 of the simulation system connection units 3-1 and 3-2 can determine that all the simulators are requesting time progress.

Next, at time (5), when the time management unit 4 of the simulation system connection units 3-1 and 3-2 confirms that all simulators are in the “time progress requesting” state as described above. The time advance request to time t + 1 is transmitted to the simulator management unit directly connected.
In the situation at time (5), all the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 are in the “time progress requesting” state. The time progression management unit 2 of the part A transmits the time progression permission to the simulators A1, A2 and the simulation system connection unit 3-1, and the time progression management unit 2 of the simulator management unit B sends the time progression permission to the simulators B1, B2 and the simulation. The time progress management unit 2 of the simulator management unit C transmits time progress permission to the simulators C1 and C2 and the simulation system connection unit 3-2.

Here, the reason why the time advance permission may be transmitted as described above will be described.
First, in the situation at time (5), all the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 transmit data with a time stamp of time t + 1 or less. You can't do it.
Therefore, regarding the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1, 3-2, it can be determined that the delivery of data with time stamps at time t + 1 or less has been completed. .
Therefore, even if the simulators A1, A2, B1, B2, C1, and C2 and the simulation system connection units 3-1 and 3-2 advance at time t + 1, the simulators A1, A2, B1, B2, C1, and C2 Since the situation where the simulation system connection units 3-1 and 3-2 receive the data with the past time stamp cannot occur, the time progress permission to the time t + 1 may be issued.

For this reason, at the time point (6), all the simulators A1, A2, B1, B2, C1, and C2 and the simulation system connection units 3-1 and 3-2 advance the logical time to t + 1.
In the example of FIG. 8, as described above, the data of the time stamp t + 1 transmitted from the simulator A1 is distributed when the logical time advances to t + 1 in the simulators B1, B2, C1, and C2, and the simulation system It can be seen that there is no delay in data distribution across the network.
As described above, when all simulator time steps are the same, it is possible to connect a plurality of simulation systems so that data delay does not occur at a small processing cost.

In the fourth embodiment, the case where three simulation systems are connected is shown. However, four or more simulation systems may be connected, and the same effect can be obtained.
In the fourth embodiment, the three simulation systems are shown as having a specific connection via the simulation system connection units 3-1, 3-2 (simulation systems A, B, C is connected in series), this is only an example and can be applied in the same way even when other connections are made.

Embodiment 5 FIG.
In the fourth embodiment, all the simulators A1, A2, B1, B2, C1, and C2 have the same time step. However, in the fifth embodiment, all the simulators A1, A2, and B1 are used. , B2, C1, and C2 will be described as being a natural number times the minimum time step.
FIG. 9 illustrates the simulators A1, B1, C1 and the simulation system connection units 3-1, 3-2 when the time steps of the simulators A1, A2, B1, B2, C1, C2 are natural number times the minimum time step. It is explanatory drawing which shows the example of progress of a typical process.

The configuration of the simulation apparatus is the same as in FIG.
However, when the time management unit 4 of the simulation system connection units 3-1 and 3-2 requests time progress, it transmits a time progress request to a future time by the minimum time step.
When the time progress management unit 2 of the simulator management units A, B, and C permits time progress, after all the simulators to be managed and the simulation system connection unit are in a time progress request state, The minimum time of the time advance request destination time of the simulation system connection unit is obtained, and the time advance permission is transmitted to the simulator to be managed and the simulation system connection unit that satisfy the condition that the time advance request destination time is equal to the minimum time.
Hereinafter, a specific example of progress of processing will be described.

In FIG. 9, it is assumed that the minimum time step is “1”, the time steps of the simulators A1, A2, C1, and C2 are “1”, and the time steps of the simulators B1 and B2 are “2”.
In this case, the time step of the simulation system connection units 3-1 and 3-2 is fixed at the minimum time step “1”.
In the initial state, it is assumed that the logic times of the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 are “t”.
In FIG. 9, descriptions regarding the simulators A2, B2, and C2 are omitted for simplicity of explanation.

First, at time point (1), simulators A1, A2, B1, B2, C1, and C2 perform simulation at time t, and simulator A1 has data D (t + 1) with time stamp t + 1 as data corresponding to the simulation result. Shall be sent. However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.
Thereafter, at time point (2), the simulators A1 and A2 transmit a time advance request for the time step “1”, which is a unique time step, to the simulator management unit A, and the simulators C1 and C2 A time advance request for the time step “1” that is the time step is transmitted to the simulator management unit C, and the simulators B1 and B2 advance the time to the future for the time step “2” that is a unique time step. The request is transmitted to the simulator management unit B.
At this time, the simulator A2 receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A.
The data transfer unit 5 of the simulation system connection unit 3-1 receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A, and promptly receives the data D (t + 1) from the simulator management unit B. Forward to.

In the situation at time (2), all the simulators A1, A2, B1, B2, C1, and C2 are in the “time progress requesting” state, and the time progress information of the simulators A1 and A2 is the time of the simulator management unit A. Held in the progress management unit 2, the time progress information of the simulators B1 and B2 is held in the time progress management unit 2 of the simulator management unit B, and the time progress information of the simulators C1 and C2 is stored in the time progress management unit 2 of the simulator management unit C Is held in.
Therefore, the time management unit 4 of the simulation system connection unit 3-1 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and the simulators A1, A2, B1, and B2 Confirm that the time progress request is in progress.
The time management unit 4 of the simulation system connection unit 3-2 refers to the time progress information held in the time progress management unit 2 of the simulator management units B and C, and the simulators B1, B2, C1, and C2 Confirm that the time progress request is in progress.

When the time management unit 4 of the simulation system connection unit 3-1 confirms that the simulators A 1, A 2, B 1, and B 2 are in the “time progress requesting” state in the situation of the time point (3), the assigned range time progress Send a request message.
When the time management unit 4 of the simulation system connection unit 3-2 confirms that the simulators B1, B2, C1, and C2 are in the “time progress requesting” state, the time management unit 4 also transmits an assigned range time progress request message.
The simulators B1 and B2 receive the data D (t + 1) transferred by the simulation system connection unit 3-1 via the simulator management unit B.
The time management unit 4 of the simulation system connection unit 3-2 also receives the data D (t + 1) transferred by the simulation system connection unit 3-1, via the simulator management unit B, and promptly receives the data D (t + 1). To the simulator management unit C.

At the next time point (4), the simulators C1 and C2 receive the data D (t + 1) transferred by the simulation system connection unit 3-2 via the simulator management unit C.
The time management unit 4 of the simulation system connection unit 3-1 receives the assigned range time progress request message transmitted from the simulation system connection unit 3-2 via the simulator management unit B.
In addition, the time management unit 4 of the simulation system connection unit 3-2 also receives the assigned range time progress request message transmitted from the simulation system connection unit 3-1 via the simulator management unit B.
Therefore, in the situation of the time point (4), the time management unit 4 of the simulation system connection units 3-1 and 3-2 transmits the assigned range time progress request message and is in charge from all simulation system connection units other than itself. The reception of the range time progress request message has been completed.
Therefore, at time (4), the time management unit 4 of the simulation system connection units 3-1 and 3-2 can determine that all the simulators are requesting time progress.

Next, at time (5), when the time management unit 4 of the simulation system connection units 3-1 and 3-2 confirms that all simulators are in the “time progress requesting” state as described above. , A progress request to a future time by the minimum time step, that is, a time progress request to time t + 1 is transmitted to the simulator management unit directly connected.
In the situation at time (5), all the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 are in the “time progress requesting” state. The time progression management unit 2 of the parts A, B, and C obtains the minimum time of the time progression request destination time of the simulator and simulation system connection unit to be managed (specifically, t + 1 for both the simulator management units A, B, and C Seeking).
The time progress management unit 2 of the simulator management units A, B, and C transmits a time progress permission to the simulator and simulation system connection unit that are to be managed that satisfy the condition that the time progress request destination time is equal to t + 1.

Here, the reason why the time advance permission may be transmitted as described above will be described.
First, in the situation at time (5), all the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 are t + 1 or less which is the minimum time of the time advance request destination time. The data with the time stamp cannot be sent.
Therefore, regarding the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1, 3-2, it can be determined that the delivery of data with time stamps at time t + 1 or less has been completed. .
Therefore, even if the simulator and simulation system connection units 3-1 and 3-2 whose time advance request destination time is equal to t + 1 advance at time t + 1 as requested, simulators A1, A2, B1, B2, and C1 , C2 or the simulation system connection units 3-1 and 3-2 cannot receive the past time-stamped data, so that the time advance permission to time t + 1 may be transmitted.

For this reason, at the time point (6), the simulators A1, A2, C1, and C2 and the simulation system connection units 3-1 and 3-2 advance the logical time to t + 1.
In the example of FIG. 9, as described above, the data of the time stamp t + 1 transmitted from the simulator A1 progresses when the logical time advances to t + 1 or exceeds t + 1 in the simulators B1, B2, C1, and C2. It can be seen that there is no delay in data distribution across simulation systems.
As described above, when the time step of each simulator is expressed by a natural number multiple of the minimum time step with respect to the predetermined minimum time step, multiple simulations that do not cause data delay at a relatively small processing cost The system can be connected.

Embodiment 6 FIG.
In the fourth embodiment, the case where all the simulators A1, A2, B1, B2, C1, and C2 have the same time step is shown, but in the sixth embodiment, the simulators A1, A2, B1, and B2 are shown. , C1 and C2 will be described in the case where no particular restriction is provided.
FIG. 10 shows the specifics of the simulators A1, B1, C1 and the simulation system connection units 3-1, 3-2 when there are no particular restrictions on the time steps of the simulators A1, A2, B1, B2, C1, C2. It is explanatory drawing which shows the example of progress of a process.

The configuration of the simulation apparatus is the same as in FIG.
However, the time management unit 4 of the simulation system connection units 3-1 and 3-2 refers to the time progress information held in each simulator management unit directly connected, and all the simulators described therein are When the time progress request is in progress, the minimum value of the time progress request destination time is obtained. Further, the minimum value of the time progress request destination time over the simulator management units directly connected to each other is obtained as a minimum range of charge, and a charge range time progress request message including the minimum range of charge is displayed. It is transmitted to another simulation system connection unit via the simulator management unit. After sending the service area time progress request message and receiving the service area time progress request message from all simulation system connections other than yourself, the service area time progress request message sent by me and all the service area times received The time progress request is transmitted to the directly connected simulator management unit with the minimum time of the assigned range minimum time included in the progress request message as the next time progress request destination time.
When the time progression management unit 2 of the simulator management units A, B, and C permits time progression, the time progression request destination time is minimum after all the simulators to be managed and the simulation system connection unit are requesting time progression. Time is obtained, and time advance permission is transmitted to the simulator and simulation system connection unit to be managed that satisfy the condition that the time advance request destination time is equal to the minimum time.
Hereinafter, a specific example of progress of processing will be described.

In FIG. 10, it is assumed that the time steps of the simulators A1 and A2 are “b”, the time steps of the simulators B1 and B2 are “c”, and the time steps of the simulators C1 and C2 are “a”.
In the initial state, it is assumed that the logic times of the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 are “t”.
“Msg [t + a]” represents an assigned range time progress request message whose assigned range minimum time is “t + a”.
In FIG. 10, descriptions regarding the simulators A2, B2, and C2 are omitted for simplification of description.

First, at time point (1), simulators A1, A2, B1, B2, C1, and C2 perform simulation at time t, and simulator A1 has data D (t + b) with time stamp t + b as data corresponding to the simulation result. Shall be sent. However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.
Thereafter, at time point (2), the simulators A1 and A2 transmit a time advance request for the time step “b”, which is a unique time step, to the simulator management unit A, and the simulators B1 and B2 A time advance request for the time step “c” that is a time step is transmitted to the simulator management unit B, and the simulators C1 and C2 advance the time to the future for the time step “a” that is a unique time step. The request is transmitted to the simulator management unit C.

At this time, the simulator A2 receives the data D (t + b) transmitted from the simulator A1 via the simulator management unit A.
Further, the data transfer unit 5 of the simulation system connection unit 3-1 receives the data D (t + b) via the simulator management unit A and transfers the data D (t + b) to the simulator management unit B promptly.
In the situation at time (2), all the simulators A1, A2, B1, B2, C1, and C2 are in the “time progress requesting” state, and the time progress information of the simulators A1 and A2 is the time of the simulator management unit A. Held in the progress management unit 2, the time progress information of the simulators B1 and B2 is held in the time progress management unit 2 of the simulator management unit B, and the time progress information of the simulators C1 and C2 is stored in the time progress management unit 2 of the simulator management unit C Is held in.
Therefore, the time management unit 4 of the simulation system connection unit 3-1 refers to the time progress information held in the time progress management unit 2 of the simulator management units A and B, and the simulators A1, A2, B1, and B2 Confirm that the time progress request is in progress.
The time management unit 4 of the simulation system connection unit 3-2 refers to the time progress information held in the time progress management unit 2 of the simulator management units B and C, and the simulators B1, B2, C1, and C2 Confirm that the time progress request is in progress.

When the time management unit 4 of the simulation system connection unit 3-1 confirms that the simulators A 1, A 2, B 1, and B 2 are in the “time progress requesting” state as described above, the assigned range indicating that fact A time progress request message is transmitted.
At that time, the assigned range minimum time is included in the assigned range time progress request message.
Here, as described above, the assigned range minimum time is the minimum value of the time advance request destination time of the simulator managed by the simulator management unit directly connected to the simulation system connection unit.
In the case of the simulation system connection unit 3-1 in FIG. 10B, the assigned range minimum time is min (t + b, t + c) = t + b. In the case of the simulation system connection unit 3-2, the assigned range minimum time is min (t + c, t + a) = t + a.

At time (3), the simulation system connection unit 3-1 transmits a charge range time progress request message (minimum range of charge range: t + b).
In addition, the simulation system connection unit 3-2 transmits an assigned range time progress request message (minimum assigned range time: t + a).
The simulators B1 and B2 receive the data D (t + b) transferred by the simulation system connection unit 3-1 via the simulator management unit B.
The time management unit 4 of the simulation system connection unit 3-2 also receives the data D (t + b) transferred by the simulation system connection unit 3-1, via the simulator management unit B, and promptly receives the data D (t + b). To the simulator management unit C.

At the next time point (4), the time management unit 4 of the simulation system connection unit 3-1 performs simulator management of the assigned range time progress request message (minimum assigned range time: t + a) transmitted from the simulation system connection unit 3-2. Receive via Part B.
In addition, the time management unit of the simulation system connection unit 3-2 also receives the assigned range time progress request message (the assigned range minimum time: t + b) transmitted from the simulation system connection unit 3-1 via the simulator management unit B.
Therefore, in the situation of the time point (4), the time management unit 4 of the simulation system connection units 3-1 and 3-2 transmits the assigned range time progress request message and is in charge from all simulation system connection units other than itself. The reception of the range time progress request message has been completed.
Therefore, at time (4), the time management unit 4 of the simulation system connection units 3-1 and 3-2 can determine that all the simulators are requesting time progress.

Next, at the time (5), the time management unit 4 of the simulation system connection units 3-1 and 3-2 transmits a time progress request.
Here, the time advance request destination time of the simulation system connection units 3-1 and 3-2 is the minimum assigned range time included in the assigned range time progress request message transmitted by the simulation system connection unit 3-1, 3-2. Is determined as the minimum value of the minimum assigned time included in the assigned range time progress request message. This value is the minimum value of the time progress request destination time of all simulators.
In the case of FIG. 10 (5), the time advance request destination times of the simulation system connection units 3-1 and 3-2 are both min (t + a, t + b) = t + a.

Therefore, in the situation at the time point (5), all the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 are in the “time progress requesting” state. The time progression management unit 2 of the simulator management units A, B, and C obtains the minimum time of the time progression request destination time of the simulator to be managed and the simulation system connection unit (specifically, the simulator management units A, B, and C). Both find t + a).
The time progress management unit 2 of the simulator management units A, B, and C transmits time progress permission to the simulator and the simulation system connection unit to be managed that satisfy the condition that the time progress request destination time is equal to t + a.

Here, the reason why the time advance permission may be transmitted as described above will be described.
First, in the situation at time (5), all the simulators A1, A2, B1, B2, C1, C2 and the simulation system connection units 3-1 and 3-2 are equal to or less than t + a which is the minimum time of the time advance request destination time. The data with the time stamp cannot be sent.
Therefore, regarding the simulators A1, A2, B1, B2, C1, and C2 and the simulation system connection units 3-1 and 3-2, it can be determined that the delivery of data with a time stamp of time t + a or less has been completed. .
Therefore, even if the simulator and simulation system connection units 3-1 and 3-2 whose time advance request destination time is equal to t + a advance at time t + a as requested, simulators A1, A2, B1, B2, and C1 , C2 or the simulation system connection units 3-1 and 3-2 may not receive the past time-stamped data, so that the time advance permission to time t + a may be transmitted.
For this reason, at the time (6), the simulators C1 and C2 and the simulation system connection units 3-1 and 3-2 advance the logical time to t + a.

In the example of FIG. 10, as described above, the data of the time stamp t + b transmitted from the simulator A1 is distributed when the time progress with the logical time exceeding t + b is performed in the simulators B1 and B2.
Although not shown in FIG. 10, the simulators C1 and C2 also transmit from the simulator A1 when the time advances with the logical time exceeding t + b (specifically, when the time advances to t + 2 * a). The received data of time stamp t + b is received. Therefore, it can be seen that there is no delay in data distribution across simulation systems.
As described above, even when there is no restriction on the time step of each simulator, it is possible to connect a plurality of simulation systems so that no data delay occurs.

Embodiment 7 FIG.
In the first embodiment, the case where the time step of the simulation system connection unit 3 is the same as the time step of the simulators A1, A2, B1, and B2 is shown. However, in the seventh embodiment, the simulation system connection unit 3 A method for solving the problem by setting the time step smaller than the time steps of the simulators A1, A2, B1, and B2 will be described.
FIG. 11 shows an example of progress of specific processing of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 when the time step of the simulation system connection unit 3 is smaller than the time steps of the simulators A1, A2, B1, and B2. It is explanatory drawing which shows.

The configuration of the simulation apparatus is the same as in FIG.
However, when the data distribution unit 1 of the simulator management units A and B receives data from the simulator and simulation system connection unit 3 to be managed, the data distribution unit 1 gives the data to the other simulator and simulation system connection unit 3 to be managed. It is transmitted at the time according to the time stamp.
The time management unit 4 of the simulation system connection unit 3 preliminarily sets a value smaller than the minimum value of the time steps of all the simulators A1, A2, B1, and B2 as the time step, and receives it from the simulator management units A and B. When the transmission of the data to the other simulator management units B and A is completed, a time advance request to a future time is transmitted to each simulator management unit A and B by the above time step.
The data transfer unit 5 of the simulation system connection unit 3 receives the data received from the simulator management units A and B, and if the data has a past time stamp after the time progress, the time stamp after a minute time after the current time. After re-adding, send to the simulator management unit other than the sender.

Further, when transmitting data, the simulators A1, A2, B1, and B2 set the time stamp as a value obtained by “current time + k * time step + minute time” (k is an integer). For example, when data representing a state after one time step is transmitted (originally, when the time stamp is “current time + time step”), k = 0 is set, and the time stamp in this case is “current time + Minute time ".
Also, when data representing the state after two time steps is transmitted (originally, the time stamp is “current time + 2 * time step”), k = 1, and the time stamp in this case is “current time” + Time step + minute time ".
That is, in the seventh embodiment, it is not possible to arbitrarily set a data time stamp. Therefore, the accuracy of the time stamp is about the time step of the simulators A1, A2, B1, and B2.
Hereinafter, a specific example of progress of processing will be described.

In FIG. 11, the time steps of the simulators A1, A2, B1, and B2 are all “4”, and in the initial state, the logical times of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 are “t”. Suppose that
The time management unit 4 of the simulation system connection unit 3 selects “2” as “a value smaller than the minimum value of the time steps of all the simulators A1, A2, B1, and B2,” and sets the time step.
In the simulators A1, A2, B1, B2 and the simulation system connection unit 3, “1” is set as the “minute time” with respect to the time stamp specified at the time of data transmission.

  First, at time point (1), the simulators A1, A2, B1, and B2 perform simulation at time t, and the simulator A1 converts the data corresponding to the simulation result into data representing the state after one time step (time t + 4). Assume that a time stamp t + 1 is given and transmitted. However, for simplification of explanation, it is assumed that simulators other than the simulator A1 do not transmit data corresponding to the simulation result.

Thereafter, at time point (2), simulators A1 and A2 transmit a time advance request to time t + 4 to simulator management unit A, and simulators B1 and B2 transmit a time advance request to time t + 4 to simulator management unit B. To do.
In addition, the time management unit 4 of the simulation system connection unit 3 transmits a time progress request for time t + 2 to the simulator management units A and B.
At this time, the simulator A2 receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A.
The data transfer unit 5 of the simulation system connection unit 3 also receives the data D (t + 1) transmitted from the simulator A1 via the simulator management unit A.

In the situation at the time point (2), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 are in a “time progress requesting” state.
Therefore, the time progress management unit 2 of the simulator management units A and B calculates the minimum time (specifically, t + 2) of the time progress request destination time of the simulator to be managed and the simulation system connection unit 3.
Then, the time progress management unit 2 of the simulator management units A and B transmits time progress permission to the simulator to be managed and the simulation system connection unit 3 that satisfy the condition that the time progress request destination time is equal to t + 2. Become.

Here, the reason why the time advance permission may be transmitted as described above will be described.
First, in the situation at time (2), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 transmit data with a time stamp equal to or less than t + 2, which is the minimum time of the time advance request destination time. It is in a state that can not be.
Therefore, with respect to the simulators A1, A2, B1, B2 and the simulation system connection unit 3, it can be determined that the delivery of data with a time stamp of time t + 2 or less has been completed.
Therefore, even if the simulator and simulation system connection unit 3 whose time advance request destination time is equal to t + 2 progresses to time t + 2 as requested, the simulators A1, A2, B1, B2 and the simulation system connection unit 3 are in the past. Since it is not possible to receive the time stamped data, the time advance permission to time t + 2 may be issued.

Therefore, at the time point (3), the simulation system connection unit 3 advances the logical time to t + 2.
Here, the data transfer unit 5 of the simulation system connection unit 3 transmits the received data D (t + 1) to the simulator management unit B. At this time, the logical time of the simulation system connection unit 3 is t + 2. Therefore, the time stamp is changed to t + 3 and transmitted.

Thereafter, at the time (4), the time management unit 4 of the simulation system connection unit 3 transmits a time progress request for time t + 4 to the simulator management units A and B.
The simulators B1 and B2 receive the data D (t + 3) transferred from the simulation system connection unit 3 via the simulator management unit B.
In the situation at the time point (4), all the simulators A1, A2, B1, B2 and the simulation system connection unit 3 are in a “time progress requesting” state.
Therefore, the time progress management unit 2 of the simulator management units A and B calculates the minimum time (specifically, t + 4) of the time progress request destination time of the simulator to be managed and the simulation system connection unit 3.
Then, the time progress management unit 2 of the simulator management units A and B transmits time progress permission to the simulator and the simulation system connection unit 3 that satisfy the condition that the time progress request destination time is equal to t + 4. Become.
Finally, at time (5), the simulators A1, A2, B1, B2 and the simulation system connection unit 3 advance the logical time to t + 4.

  In FIG. 11, as described above, the data transmitted from the simulator A1 is distributed to all the simulators when the time advances at the next time. However, the simulator A2 needs to interpret the time stamp t + 1 of the received data as t + 4, and the simulators B1 and B2 interpret the time stamp t + 3 of the received data as t + 4 and execute the subsequent simulation.

As described above, by setting the time step of the simulation system connection unit 3 to be smaller than the time steps of all the simulators A1, A2, B1, and B2, a plurality of simulations that do not cause data delay at a small processing cost. The system can be connected.
When the simulation apparatus according to the seventh embodiment is mounted using HLA, unlike the first embodiment, the simulation system connection unit 3 may be set as time-regulating and time-constrained. Good.
In the seventh embodiment, since the simulation system connection unit 3 does not need to refer to the time progress information held in the RTI, unlike the first embodiment, it is not necessary to use the MOM function or the like. .

It is a block diagram which shows the simulation apparatus by Embodiment 1 of this invention. It is a flowchart which shows the process procedure corresponding to the time progress for one time of the simulation system connection part 3. FIG. It is explanatory drawing which shows the example of progress of the specific process of simulator A1, A2, B1, B2 and simulation system connection part 3, when the time step of simulator A1, A2, B1, B2 is the same. A configuration showing a simulation apparatus in which one simulation system connection unit 3 connects three simulation systems A, B, and C and the simulators A1, A2, B1, B2, C1, and C2 perform simulation while exchanging data. FIG. Explanatory drawing which shows the example of progress of the concrete process of simulator A1, A2, B1, B2 and simulation system connection part 3 when the time step of simulator A1, A2, B1, B2 is a natural number multiple of the minimum time step. It is. It is explanatory drawing which shows the example of progress of the specific process of simulator A1, A2, B1, B2 and the simulation system connection part 3 when restrictions are not provided especially about the time step of simulator A1, A2, B1, B2. . It is a block diagram which shows the simulation apparatus by Embodiment 4 of this invention. An example of the progress of specific processing of the simulators A1, B1, C1 and the simulation system connection units 3-1, 3-2 when the time steps of the simulators A1, A2, B1, B2, C1, C2 are the same is shown. It is explanatory drawing. Specific processing of simulators A1, B1, C1 and simulation system connection units 3-1 and 3-2 when the time steps of simulators A1, A2, B1, B2, C1, and C2 are natural number times the minimum time step It is explanatory drawing which shows the example of progress of. Progress of specific processing of simulators A1, B1, C1 and simulation system connection units 3-1, 3-2 when there are no particular restrictions on the time steps of simulators A1, A2, B1, B2, C1, C2 It is explanatory drawing which shows the example of. Description showing an example of progress of specific processing of the simulators A1, A2, B1, and B2 and the simulation system connection unit 3 when the time step of the simulation system connection unit 3 is smaller than the time steps of the simulators A1, A2, B1, and B2. FIG. It is a block diagram which shows the simulation apparatus which implement | achieves the connection system of a some simulation system. It is a flowchart which shows the process sequence corresponding to the time progress for one time of each simulator. It is a flowchart which shows the process sequence corresponding to the time progress for one time of a simulation system connection means. It is explanatory drawing which shows the example of progress of the specific process of simulator A1, A2, B1, B2 and a simulation system connection means.

Explanation of symbols

  A1, A2, B1, B2, C1, C2 Simulator, A, B, C Simulator management section (simulator management means), 1 data distribution section, 2 time progress management section, 3 simulation system connection section (network connection means), 3 -1,3-2 Simulation system connection part (network connection means), 4 time management part, 5 data transfer part.

Claims (7)

  In a simulation apparatus in which a plurality of simulators perform simulation while exchanging data with other simulators, manage a plurality of networks to which at least one simulator is connected and time progress of the simulators connected to the networks. In addition, a plurality of simulator management means for distributing data transmitted from the simulator to other simulators connected to the same network, and a network connection for performing data transfer between the networks connected between the plurality of networks And the simulator management means receives all the simulators connected to the same network as itself and the time progress request from the network connection means, and the simulator and the network. When the network connection means receives the data distributed from the simulator management means connected to a certain network, the data is immediately transferred to the simulator management means connected to another network. Then, a time progress request is transmitted to the plurality of simulator management means.   When a plurality of network connection means are connected between a plurality of networks, when a data distributed from a simulator management means connected to a certain network is received, a simulator connected to another network 2. The simulation apparatus according to claim 1, wherein the data is immediately transferred to another network connection means via the management means.   The network connection means transmits a time advance request for advancing time to the same logical time as the logical time at which the plurality of simulators request time advance, and receives permission for time advance from the simulator management means. 3. The simulation apparatus according to claim 1, wherein the time is advanced to the logical time.   The simulator sends a time progress request to advance the logical time by a natural number times the minimum time step to the simulator management means, and the network connection means sends a time advance request to advance the logical time by the minimum time step to the simulator management means, 2. When the time management permission is received from the simulator management means, the simulator advances the logical time by a natural number multiple of the minimum time step, and the network connection means advances the logical time by the minimum time step. Or the simulation apparatus of Claim 2.   The network connection means transmits a time advance request to advance the time to the smallest logical time among the logical times at which a plurality of simulators request time advance, to the simulator management means, and from the simulator management means 2. The simulation apparatus according to claim 1, wherein upon permission, the time is advanced to the logical time.   The network connection means obtains the smallest logical time among the logical times at which a plurality of simulators request time progress, receives the smallest logical time obtained by other network connection means, and obtains the obtained logical time. When the time advance request for advancing the time to the smaller logical time of the time and the received logical time is transmitted to the simulator management means and the time advance permission is received from the simulator management means, the time is advanced to the logical time. The simulation apparatus according to claim 2.   In a simulation apparatus in which a plurality of simulators perform simulation while exchanging data with other simulators, manage a plurality of networks to which at least one simulator is connected and time progress of the simulators connected to the networks. In addition, a plurality of simulator management means for distributing data transmitted from the simulator to other simulators connected to the same network, and a network connection for performing data transfer between the networks connected between the plurality of networks And the simulator management means receives all the simulators connected to the same network as itself and the time progress request from the network connection means, and the simulator and the network. When the time connection request is received and the network connection means receives data distributed from the simulator management means connected to a certain network during the time progress request, the network connection means is connected to another network after the time progress. After transferring to the simulator management means, sending a time advance request to advance the time in a time step smaller than the time steps of the plurality of simulators to the simulator management means and receiving permission for time advance from the simulator management means, A simulation apparatus characterized by advancing time by the time step.

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