JP2003330977A - Electromagnetic field analyzing device and electromagnetic field analyzing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic field analyzing device and an electromagnetic field analyzing method in which calculation grids do not have to be fine over the whole of the zone to be analyzed even if an analysis with high space resolution is needed for a part of the zone, which prevents the increase of the entire calculation quantity, can realize high-speed calculation and reduce calculation costs required for highly accurate analysis. <P>SOLUTION: A division part 4 of calculation zone hierarchy divides a zone with insufficient calculation accuracy from a calculation zone 11 determined by a calculation accuracy evaluation part 3 as calculation accuracy is insufficient into a highly accurate calculation zone 12 in a hierarchy and defines the highly accurate calculation zone 12 to a new grid zone with high space resolution based on calculation accuracy information of accuracy data in the zone to the analyzed, that is, generates the calculation grid finer than the calculation grid generated by a calculation grid generation part 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic field analysis apparatus and an electromagnetic field analysis method for analyzing an electromagnetic field for designing electronic / electrical devices utilizing electromagnetic phenomena such as transformers, reactors, motors, etc. The present invention relates to an electromagnetic field analysis device and an electromagnetic field analysis method for dividing a generated calculation grid into a plurality of calculation regions and assigning the divided calculation regions to processors of a parallel computer to perform electromagnetic field analysis.

[0002]

2. Description of the Related Art Conventionally, in the case of parallel calculation of a region to be analyzed by a plurality of processors, for example, Japanese Patent Laid-Open No. 3208/1996.
As disclosed in Japanese Patent Publication No. 97, the calculation grid generated in the analysis target region is divided into the same number of regions as the number of processors used for parallel calculation, and the calculation of each region divided by the processors used for parallel calculation is performed. I was going.

[0003]

However, in the prior art, when an analysis with high spatial resolution is required in a part of the analysis target area, it is necessary to make the calculation grid finer in the entire area, and the total calculation amount. Therefore, there is a problem that the calculation speed is impaired and a large calculation cost is required for the high precision analysis.

The present invention has been made in view of the above problems, and an object of the present invention is to perform calculation in the entire region even when a high spatial resolution analysis is required in a part of the analysis target region. The point is to provide an electromagnetic field analysis device and an electromagnetic field analysis method that do not need to make the grid fine, can prevent the increase of the total calculation amount, can realize high-speed calculation, and can reduce the calculation cost for high-precision analysis. is there.

[0005]

The present invention has the following constitution in order to solve the above problems. The gist of the invention according to claim 1 is an electromagnetic field analysis apparatus that divides a calculation grid generated in an analysis target area into a plurality of calculation areas, and assigns the decomposed calculation areas to a plurality of calculation means respectively to perform parallel calculation. A calculation grid generating means for generating a uniform first calculation grid over the entire analysis target area; and a first calculation grid for dividing the first calculation grid generated by the calculation grid generating means into a plurality of calculation areas. One calculation area dividing unit, and an area of insufficient calculation accuracy among the calculation areas divided by the first calculation area dividing unit is divided as a high-precision calculation area, and the calculation area is divided according to the calculated calculation accuracy. Second calculation area dividing means for generating a high-precision calculation grid finer than the first calculation grid, and calculation area allocating means for allocating the calculation area and the high-precision calculation area to the plurality of calculation means It consists in electromagnetic field analysis apparatus, characterized by Bei. Further, the gist of the invention according to claim 2 is that the first calculation area dividing unit divides the first calculation grid into a smaller number of calculation areas than the number of the plurality of calculation units. The electromagnetic field analyzer according to claim 1. Further, the gist of the invention according to claim 3 is that the second calculation area dividing means hierarchizes the high-precision calculation grid finer than the first calculation grid in the high-precision calculation area in accordance with the required calculation accuracy. The electromagnetic field analysis apparatus according to claim 1 or 2, wherein the electromagnetic field analysis apparatus generates the electromagnetic field. According to a fourth aspect of the present invention, the first calculation area dividing unit determines the number of the calculation areas to be divided according to the number of the high precision calculation areas to be divided by the second calculation area dividing unit. The electromagnetic field analysis apparatus according to any one of claims 1 to 3, wherein: A fifth aspect of the present invention is characterized by comprising a grid number adjusting means for adjusting the number of grids of the calculation areas and the high-precision calculation areas assigned to the plurality of calculation means. The electromagnetic field analyzer described in any one of 1. The invention according to claim 6 is characterized in that the grid number adjusting means adjusts the number of grids so as to equalize loads on the calculations of the plurality of calculating means. It exists in the electromagnetic field analyzer. The gist of the invention according to claim 7 is that the grid number adjusting means moves a grid between the calculation area and the high-precision calculation area that are adjacent to each other, and the electromagnetic field analysis apparatus according to claim 5 or 6. Exist in. Further, the gist of the invention according to claim 8 is an electromagnetic field analysis method for dividing a calculation grid generated in an analysis target area into a plurality of calculation areas and assigning the decomposed calculation areas to a plurality of calculation means respectively for parallel calculation. That is, a uniform first calculation grid is generated over the entire analysis target area, the first calculation grid is divided into a plurality of calculation areas, and an area in which calculation accuracy is insufficient is calculated. A high-precision calculation area is divided, a high-precision calculation grid finer than the first calculation grid is generated according to the calculation accuracy required for the high-precision calculation area, and the calculation area and the high-precision calculation area are divided into a plurality of areas. The present invention resides in an electromagnetic field analysis method characterized by performing parallel calculation by allocating to the calculation means. The invention according to claim 9 is the electromagnetic field analysis method according to claim 8, characterized in that the first calculation grid is divided into a smaller number of the calculation areas than the plurality of calculation means. Exist. Further, the gist of the invention according to claim 10 is that the high-precision calculation grid finer than the first calculation grid is hierarchically generated in the high-precision calculation area in accordance with the required calculation accuracy. Item 8 or 9
It exists in the electromagnetic field analysis method described. The invention according to claim 11 is the electromagnetic field analysis method according to any one of claims 8 to 10, characterized in that the number of the calculation regions is set according to the number of the high-precision calculation regions. Exist. The gist of the invention according to claim 12 is to adjust the number of grids of the calculation region and the high-precision calculation region assigned to the plurality of calculation means, and the electromagnetic field according to any one of claims 8 to 10. It depends on the analysis method. Claim 1
The third aspect of the present invention is the electromagnetic field analysis method according to any one of claims 8 to 10, wherein the number of grids is adjusted so that the loads applied to the calculations of the plurality of calculation means are equalized. Exist. The invention according to claim 14 is characterized in that a grid is moved between the adjacent calculation areas and the high-precision calculation areas to adjust the number of grids of the calculation areas and the high-precision calculation areas. The electromagnetic field analysis method according to any one of Items 8 to 10. The gist of the invention according to claim 15 resides in a program for causing a computer to execute the electromagnetic field analysis method according to any one of claims 8 to 14.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing a configuration of a first embodiment of an electromagnetic field analysis apparatus according to the present invention.

The first embodiment will be described with reference to FIG.
Calculation grid generation unit 1, calculation area division unit 2, calculation accuracy evaluation unit 3, calculation area hierarchical division unit 4, mapping unit 5
And a plurality of high-precision calculation units 6, and receives the analysis target region data and the precision data in the analysis target region input from the input means (not shown), and divides the analysis target region by the plurality of high-precision calculation units 6. Calculate.

The calculation grid generating unit 1 receives analysis target area data defining an analysis target area which is a target area of electromagnetic field analysis, and based on the analysis target area data, a uniform orthogonal structure to the entire analysis target area. Generate a computational grid that is a grid. The calculation grid generated by the calculation grid generation unit 1 has a uniform spatial resolution in the entire analysis target area.
Note that the spatial resolution of the calculation grid generated by the calculation grid generation unit 1 is set for the region in the analysis target region that may have the lowest calculation accuracy.

The calculation area dividing unit 2 divides the calculation grid generated by the calculation grid generation unit 1 into a plurality of calculation areas 1.
Set 1. The number of calculation regions 11 divided and set by the calculation region dividing unit 2 is smaller than the number of high-precision calculation units 6, and for example, if the number of high-precision calculation units 6 is 10, the calculation region 11 Is divided into 9 or less. In addition, each calculation region 11 is divided so that the calculation time required to obtain a solution in each high-precision calculation unit 6 estimated from the number of calculation grids is averaged, and the calculation capabilities of the high-precision calculation unit 6 are different. In, the number of calculation grids of each calculation region 11 is set in consideration of the calculation capacity of the high precision calculation unit 6.

The calculation accuracy evaluation unit 3 receives the analysis target area, that is, the accuracy data in the analysis target area indicating the calculation accuracy information estimated from the shape of the calculation target model, and calculates the calculation area 11 of the calculation area 11 divided by the calculation area dividing unit 2. It is evaluated whether or not the calculation accuracy of the calculation grid generated by the calculation grid generation unit 1 is sufficient.

The calculation area hierarchical division unit 4 hierarchically divides an area with insufficient calculation accuracy from the calculation area 11 with insufficient calculation accuracy by the calculation accuracy evaluation unit 3 (hereinafter, hierarchical division). The calculated region is referred to as a high-precision calculation region 12, and the high-precision calculation region 12 is defined as a new grid region having a high spatial resolution based on the calculation accuracy information of the accuracy data in the analysis target region, that is, by the calculation grid generation unit 1. A finer calculation grid than the generated calculation grid is generated.

The mapping section 5 includes a calculation area 11 divided by the calculation area dividing section 2 and a calculation area hierarchical dividing section 4.
The high-accuracy calculation area 12 and the high-accuracy calculation area 12 divided by are respectively allocated to the plurality of high-accuracy calculation units 6.

The high-precision calculation unit 6 is a processor of a parallel computer, calculates the calculation region 11 or the high-precision calculation region 12 allocated by the mapping unit 5, and analyzes the analysis target region with sufficient calculation accuracy.

Next, the operation of the first embodiment will be described with reference to FIG.
And it demonstrates in detail with reference to FIG. FIG. 2 is a flowchart for explaining the operation of the first embodiment of the electromagnetic field analysis apparatus according to the present invention, and FIG. 3 is a hierarchical division of a calculation grid by the calculation area hierarchical division unit shown in FIG. It is a figure which shows the example of.

First, the calculation grid generation unit 1 generates a calculation grid which is a uniform orthogonal structure grid for the entire analysis target area based on the received analysis target area data (step A).
1), the calculation area dividing unit 2 divides the calculation grid generated by the calculation grid generation unit 1 and sets a smaller number of calculation areas 11 than the number of high-precision calculation units 6 (step A).
2).

The number of calculation areas 11 divided by the calculation area dividing unit 2 may be set in advance to a number smaller than the number of high precision calculation units 6, and by the calculation area hierarchical dividing unit 4. When the number of high-precision calculation areas 12 to be divided is input in advance as the precision data in the analysis target area, it is set to the number obtained by subtracting the number of high-precision calculation areas 12 from the number of high-precision calculation units 6. It may be configured to.

Next, the calculation accuracy evaluation unit 3 evaluates the calculation accuracy of the calculation area 11 divided by the calculation area dividing unit 2 based on the accuracy data in the analysis target area (step A).
3), it is determined whether the calculation accuracy of the calculation area 11 is sufficient or insufficient with the calculation grid generated by the calculation grid generation unit 1 (step A4).

When it is determined in step A4 that the calculation accuracy is insufficient, the calculation area hierarchical division unit 4 calculates with high accuracy an area in which the calculation accuracy is insufficient among the calculation areas 11 in which the calculation accuracy is insufficient. As shown in FIG. 3, the region 12 is hierarchically divided, and the divided high-precision calculation region 12 is defined, that is, a new high-resolution grid region is defined based on the calculation precision information of the precision data in the analysis target region. A calculation grid smaller than the calculation grid generated by the grid generation unit 1 is generated (step A5).

In step A4, when the calculation accuracy of all calculation areas 11 (areas excluding the high-precision calculation area 12 when the high-precision calculation area 12 is divided) is sufficient, the mapping unit 5 divides the calculation areas. The calculation region 11 divided by the unit 2 and the high-precision calculation region 12 divided by the calculation-region hierarchical dividing unit 4 are allocated and mapped to a plurality of high-precision calculation units 6 (step A6).

The high precision calculation unit 6 to which the calculation region 11 is assigned performs calculation with the calculation precision of the calculation lattice generated by the calculation lattice generation unit 1 (step A7), and the high precision calculation region 1 is calculated.
The high precision calculation unit 6 to which 2 is assigned performs high precision calculation with the calculation precision of the calculation grid generated by the calculation region hierarchical division unit 4 (step A8), and the divided region (calculation region 1
1. The data of the boundary of the high-precision calculation area 12) is shared by the adjacent areas to transfer the calculation result and obtain the high-precision calculation result (step A9). The calculation result of the high-precision calculation area 12 is used for calculation in the area including the high-precision calculation area 12 (calculation area 11, high-precision calculation area 12), and this work is performed up to the largest calculation area 11. Perform the desired analysis by.

Next, the operation of the first embodiment will be described in detail with reference to FIG. 4 by taking a concrete model example. Figure 4
FIG. 4 is a diagram showing an example of a calculation target model which is an analysis target in the first embodiment of the electromagnetic field analysis apparatus according to the present invention.

Referring to FIG. 4, the model to be calculated includes a housing 22 of the desktop computer, a printed circuit board 23 stored in the housing 22, and wirings 24 on the printed circuit board 23. 1 GHz from the wiring 24 on the printed circuit board 23 in the state where 22 is placed in the room 21
The analysis target is how the electromagnetic radiation below is radiated.

One side of the room 21 is set to about 3 m, one side of the housing 22 is set to about 50 cm, one side of the printed circuit board 23 is set to about 30 cm, the thickness is set in mm, and the thickness of the wiring 24 is set. It is set to about 0.2 mm. Therefore, the minimum calculation grid interval around the wiring 24 is on the order of 0.01 mm, while the calculation grid interval required for analysis in the room 21 is several cm, and an attempt is made to calculate this model to be calculated by the conventional method. , The entire room must be divided at the minimum calculation grid interval, resulting in a huge number of calculation grids, a huge calculation time, and an unrealistic calculation amount.

In the present invention, the calculation grid generation unit 1 generates a calculation grid (interval: several cm) for the room 21,
The room 21 is divided by the calculation area dividing unit 2 to set the number of calculation areas 11 smaller than the number of the high precision calculation units 6.

Next, the calculation area hierarchical division unit 4 divides the area of the housing 22 from the calculation area 11 into the high-precision calculation area 12 of the first hierarchy, and the calculation grid (interval: A few millimeters) to generate a second area around the wiring 24.
Is divided from the calculation area 11 as the high-precision calculation area 12 of the hierarchy of, and the calculation grid (interval: 0.
01 mm) is generated.

Next, the mapping unit 5 calculates the calculation area 11
And the high-precision calculation areas 12 of the first and second hierarchies are respectively assigned to the plurality of high-precision calculation sections 6, and the high-precision calculation sections 6 assigned to each of the high-precision calculation areas 6 cause the calculation area 11 to
The calculation is performed with the calculation accuracy of the calculation grid for the room 21, and the high-accuracy calculation area 12 of the first hierarchy performs the calculation with the calculation accuracy of the calculation grid for the housing 22 and the calculation accuracy of the second hierarchy. The high-precision calculation area 12 performs calculation with the calculation accuracy of the calculation grid around the wiring 24.

(Second Embodiment) FIG. 5 is a block diagram showing the configuration of the second embodiment of the electromagnetic field analysis apparatus according to the present invention.

The second embodiment will be described with reference to FIG.
In addition to the configuration of the first embodiment, a load equalization unit 7 that makes the load of each high precision calculation unit 6 uniform is provided.

The load equalization unit 7 and the calculation region hierarchical division unit 4 divide the calculation region 11 divided by the calculation region division unit 2 so that the calculation time required by each high precision calculation unit 6 is almost the same. The mapping unit 5 adjusts the number of calculation grids with the high-precision calculation region 12 divided by
Each area adjusted by is assigned to each of the plurality of high precision calculation units 6.

The load equalizing unit 7 equalizes the number of calculation grids that each high-precision calculating unit 6 is responsible for when the calculation capabilities of the high-precision calculating units 6 are uniform, so that the calculation capabilities of the high-precision calculating units 6 are equalized. When the values are different from each other, the number of calculation grids that each high-precision calculation unit 6 handles is adjusted in consideration of the calculation capability of each high-precision calculation unit 6.

The adjustment of the number of calculation grids by the load equalizing unit 7 is performed by adjoining the calculation areas 11 or the high-precision calculation areas 12.
It is performed by comparing the number of calculation grids in, and moving the calculation grid from the area having the larger calculation grid number to the area having the smaller calculation grid number. It should be noted that when the calculation grids are moved between the regions, the calculation regions covered by the respective high-precision calculation units 6 are not divided, that is, the calculation regions covered by the respective high-precision calculation units 6 are continuous regions. .

As described above, according to the present embodiment, the calculation region hierarchical division unit 4 calculates the region with insufficient calculation precision out of the calculation regions 11 with insufficient calculation precision with high precision. Even if a high spatial resolution analysis is required for a part of the analysis target area, the area 12 is hierarchically divided to define a new grid area having a high spatial resolution. Since it is possible to make the calculation grid finer only in the area where the calculation is necessary, it is not necessary to make the calculation grid fine in all areas, and it is possible to prevent an increase in the total calculation amount, to realize high-speed calculation, and to perform calculations for high-precision analysis. The effect is that the cost can be reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and it is obvious that each embodiment can be modified appropriately within the scope of the technical idea of the present invention. Further, the number, position, shape, etc. of the above-mentioned constituent members are not limited to those in the above-mentioned embodiment, and the number, position, shape, etc. suitable for carrying out the present invention can be adopted. In addition, in each figure, the same components are denoted by the same reference numerals.

[0035]

According to the electromagnetic field analysis device and the electromagnetic field analysis method of the present invention, a region of insufficient calculation accuracy out of the calculation regions whose calculation precision is insufficient by the calculation region hierarchical division unit is set as a high precision calculation region. By hierarchically dividing and configuring to define a new high spatial resolution grid region,
Even if analysis with high spatial resolution is required in part of the analysis target area, the calculation grid can be made fine only in the area requiring high-precision analysis, so there is no need to make the calculation grid fine in all areas, The total amount of calculation is prevented from increasing,
It is possible to realize high-speed calculation and reduce the calculation cost for high-precision analysis.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an electromagnetic field analysis apparatus according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment of the electromagnetic field analysis apparatus according to the present invention.

3 is a diagram showing an example of hierarchical division of a calculation grid by a calculation area hierarchical division unit shown in FIG.

FIG. 4 is a diagram showing an example of a calculation target model which is an analysis target in the first embodiment of the electromagnetic field analysis apparatus according to the present invention.

FIG. 5 is a block diagram showing a configuration of a second embodiment of an electromagnetic field analysis apparatus according to the present invention.

[Explanation of symbols] 1 Computational grid generator 2 Calculation area division 3 Calculation accuracy evaluation section 4 Calculation Area Hierarchical Division 5 Mapping section 6 High-precision calculation section 7 Load equalization section 11 Computational domain 12 High-precision calculation area 21 rooms 22 housing 23 Printed circuit board 24 wiring

Claims (15)

[Claims] 1. An electromagnetic field analysis apparatus for dividing a calculation grid generated in an analysis target area into a plurality of calculation areas, and assigning the decomposed calculation areas to a plurality of calculation means respectively for parallel calculation. A calculation grid generating unit that generates a uniform first calculation grid in the entire target region, and a first calculation region dividing unit that divides the first calculation lattice generated by the calculation grid generating unit into a plurality of calculation regions. Means, and an area of insufficient calculation accuracy among the calculation areas divided by the first calculation area dividing means is divided as a high-precision calculation area, and the first calculation grid is calculated according to the calculated calculation accuracy. A second calculation area dividing means for generating a finer high-precision calculation grid; and a calculation area allocation means for allocating the calculation area and the high-precision calculation area to the plurality of calculation means. Electromagnetic field analysis apparatus according to claim. 2. The first calculation area dividing means divides the first calculation grid into a smaller number of calculation areas than the number of the plurality of calculation means. Electromagnetic field analyzer. 3. The second calculation area dividing means hierarchically generates the high-precision calculation grid finer than the first calculation grid in the high-precision calculation area according to the required calculation accuracy. The electromagnetic field analysis device according to claim 1, which is characterized in that. 4. The first calculation area dividing unit sets the number of the calculation areas to be divided according to the number of the high precision calculation areas divided by the second calculation area dividing unit. The electromagnetic field analysis device according to any one of claims 1 to 3. 5. The grid number adjusting means for adjusting the number of grids of the calculation area and the high-accuracy calculation area assigned to the plurality of calculation means, according to any one of claims 1 to 4. Electromagnetic field analyzer. 6. The electromagnetic field analyzing apparatus according to claim 5, wherein the grid number adjusting unit adjusts the number of grids so that loads on the calculations of the plurality of calculating units are equalized. 7. The electromagnetic field analyzing apparatus according to claim 5, wherein the grid number adjusting means moves a grid between the calculation area and the high precision calculation area which are adjacent to each other. 8. An electromagnetic field analysis method in which a calculation grid generated in an analysis target area is divided into a plurality of calculation areas, and the decomposed calculation areas are respectively assigned to a plurality of calculation means to perform parallel calculation. A uniform first calculation grid is generated in the entire target area, the first calculation grid is divided into a plurality of calculation areas, and an area of insufficient calculation accuracy in the calculation area is divided as a high-precision calculation area. However, according to the calculation accuracy required for the high-precision calculation area, the first
A high-precision calculation grid smaller than the calculation grid is generated, and the calculation area and the high-precision calculation area are assigned to the plurality of calculation means to perform parallel calculation. 9. The electromagnetic field analysis method according to claim 8, wherein the first calculation grid is divided into a smaller number of the calculation areas than the plurality of calculation means. 10. The high-precision calculation grid finer than the first calculation grid is hierarchically generated in the high-precision calculation area according to the calculated calculation accuracy. Electromagnetic field analysis method. 11. The electromagnetic field analysis method according to claim 8, wherein the number of calculation areas is set according to the number of high-precision calculation areas. 12. The electromagnetic field analysis method according to claim 8, wherein the number of grids in the calculation area and the high-precision calculation area assigned to the plurality of calculation means is adjusted. 13. The electromagnetic field analysis method according to claim 8, wherein the number of grids is adjusted so that the loads applied to the calculations of the plurality of calculation means are equalized. 14. The grid number is adjusted between the calculation area and the high-precision calculation area that are adjacent to each other to adjust the number of grids in the calculation area and the high-precision calculation area. The electromagnetic field analysis method described in Crab. 15. A program for causing a computer to execute the electromagnetic field analysis method according to claim 8.