CN104034315B - Assembly method of truss structure for ultra-long focal length remote sensing camera - Google Patents

Abstract

The method for assembling the truss structure of the ultra-long focal length remote sensing camera relates to the field of aerospace. For the deformation under the self-weight load determined in step 1, use the finite element calculation method to calculate the theoretical value of the angle and line quantity change of the assembly link; use the theoretical deformation value obtained in step 2 as the compensation amount during assembly of the assembly link Perform pre-compensation; assemble the truss rod group according to the assembly data after compensation in step 3 and the assembly method determined in step 1; after the assembly is completed, put it aside for 10 to 15 days to release the stress and inspect the truss structure. The assembly method of the present invention takes up less space in the direction of gravity, requires less design and assembly tooling, has a larger operable space, and is less likely to cause measurement errors, operational errors, and the like.

Description

Assembly method of truss structure for ultra-long focal length remote sensing camera

technical field

The invention relates to the field of aerospace technology, in particular to an assembly method for a truss structure of an ultra-long focal length remote sensing camera.

Background technique

The frame structure is the skeleton structure of the space camera, responsible for the support and positioning of important components such as optical components and control electrical boxes, so it plays a key role in the imaging of the space camera.

When the focal length of the remote sensing camera is too large, the size of the truss structure in the direction of the optical axis will be too large (that is, the distance between the primary and secondary mirrors is too large). The axial direction (generally the direction with the largest dimension) is parallel to the horizontal direction of the earth. This method takes up too much space in the direction of gravity, and the required design and assembly tooling volume is too large, which makes the operable space small and easily causes measurement errors. , operating errors, etc.

Contents of the invention

In order to solve the problems existing in the assembly method of the truss structure of the remote sensing camera that the gravity direction occupies too much space, the required assembly tooling volume is too large, the operable space is small, and it is easy to cause measurement errors and operation errors, the present invention provides a super The assembly method of the truss structure of the remote sensing camera with long focal length.

The technical scheme that the present invention adopts for solving technical problems is as follows:

An assembly method for a truss structure of an ultra-long focal length remote sensing camera, the method is realized by the following steps:

Step 1. Place the optical axis direction of the remote sensing camera vertically to the horizontal direction of the earth, and design the truss structure assembly tooling according to the assembly method;

Step 2: Install the first assembly link on the support platform, install the second assembly link on the assembly tooling, use position measuring equipment to measure the relative positional relationship between the first assembly link and the second assembly link, and adjust the assembly Tooling until the second assembly link is adjusted to the target installation position;

Step 3. Analyzing the deformation of the entire remote sensing camera under the action of the self-weight load under the assembly method determined in step 1, and calculating the theoretical values of the angle and line quantity changes of the first assembly link and the second assembly link by means of finite element calculation;

Step 4. Use the theoretical value of the angle and line change calculated in step 3 for the first assembly link and the second assembly link as the compensation amount for the theoretical assembly value of the first assembly link and the second assembly link. The target installation position of the second assembly link is pre-compensated;

Step 5. Assembling the truss bar group according to the compensated assembly data in step 4 and the assembly method determined in step 1;

Step 6. After the truss rod assembly is assembled, put it on hold for 10-15 days to release the stress;

Step 7: Detect the relative positions of the first assembly link and the second assembly link by using a position measuring device.

The assembly tool has the ability to adjust six degrees of freedom to meet the requirements for adjustment accuracy in six directions.

The beneficial effects of the present invention are: the assembly method of the present invention adopts the method of placing the optical axis direction of the remote sensing camera perpendicular to the horizontal direction of the earth, the space occupied by the truss structure in the direction of gravity will be greatly reduced, and it has a structure similar to that of a small camera frame structure. The difficulty of assembly; the required design and assembly tooling volume is small, and the operable space is large, which is not easy to cause measurement errors and operation errors; the finite element calculation method is used to pre-compensate the self-weight deformation caused by the changing direction, which can be used in the system After the assembly is completed, the actual self-weight deformation will be offset against the calculated pre-compensation value, so that the truss structure of the ultra-long focal length remote sensing camera can be better assembled near the theoretical value.

Description of drawings

Fig. 1 is a schematic diagram of the composition and structure of the assembly device used in the assembly method of the truss structure of the ultra-long focal length remote sensing camera of the present invention.

Fig. 2 is a schematic flowchart of the assembly method of the truss structure of the ultra-long focal distance remote sensing camera of the present invention.

In the figure: 1. Supporting platform, 2. Position measuring equipment, 3. First assembly link, 4. Second assembly link, 5. Truss bar group, 6. Assembly and adjustment tooling.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 2, a kind of assembling method of the truss structure of the ultra-long focal length remote sensing camera of the present invention, this method is realized by the following steps:

Step 1. Place the direction of the optical axis of the remote sensing camera (the direction with the largest size) perpendicular to the horizontal direction of the earth, and design the truss structure assembly tooling 6 according to this assembly method. The assembly tooling 6 should have the ability to adjust 6 degrees of freedom to meet the requirements of 6 directions. Adjust the precision requirements, and its specific structure can be designed according to the needs;

Step 2, as shown in Figure 1, install the first assembly link 3 on the support platform 1, install the second assembly link 4 on the assembly and adjustment tool 6, and use the position measuring device 2 to measure the first assembly link 3 and the second assembly link 3. The relative positional relationship of the second assembly link 4, and adjusting the assembly tooling 6 until the second assembly link 4 is adjusted to the target installation position;

Step 3. Analyze the deformation of the entire remote sensing camera under the action of its own weight load under the assembly method determined in step 1, and use the finite element calculation method to calculate the theory of the angle and line quantity change of the first assembly link 3 and the second assembly link 4 value;

Step 4, use the theoretical value of the angle and line quantity change of the first assembly link 3 and the second assembly link 4 calculated in step 3 as the compensation amount of the theoretical value of the first assembly link 3 and the second assembly link 4 to the first assembly link 3 and the second assembly link 4. The target installation positions of the assembly link 3 and the second assembly link 4 are pre-compensated;

Step 5, assemble the truss bar group 5 according to the compensated assembly data in step 4 and the assembly method determined in step 1 (the optical axis direction of the remote sensing camera is placed vertically to the horizontal direction of the earth);

Step 6. After the truss rod group 5 is assembled, it is put on hold for 10-15 days to release the stress. The relative position of the first assembly link 3 and the second assembly link 4 is detected by the position measuring device 2. A truss structure close to the theoretical value can be obtained below.

The assembly method of the present invention effectively avoids a series of problems caused by the large volume of the truss structure, the required assembly tooling 6 has a simple structure, does not occupy too much operating space, the method process is easy to operate, and can better obtain theoretical assembly accuracy .

Claims (2)

1. The method for assembling the truss structure of the ultra-long focal length remote sensing camera is characterized in that the method is realized by the following steps: Step 1. Place the optical axis direction of the remote sensing camera vertically to the horizontal direction of the earth, and design the truss structure assembly tooling (6) according to the assembly method; Step 2. Install the first assembly link (3) on the support platform (1), install the second assembly link (4) on the assembly tooling (6), and measure the first assembly link with the position measuring device (2). (3) the relative positional relationship with the second assembly link (4), and adjust the assembly tooling (6) until the second assembly link (4) is adjusted to the target installation position; Step 3. Analyze the deformation of the entire remote sensing camera under the action of its own weight in the assembly method determined in step 1, and use the finite element calculation method to calculate the angle and line of the first assembly link (3) and the second assembly link (4). The theoretical value of the quantity change; Step 4. The theoretical value of the angle and line quantity change of the first assembly link (3) and the second assembly link (4) calculated in step 3 is used as the assembly of the first assembly link (3) and the second assembly link (4) The compensation amount of the theoretical value pre-compensates the target installation positions of the first assembly link (3) and the second assembly link (4); Step 5. Assembling the truss bar group (5) according to the compensated assembly data in step 4 and the assembly method determined in step 1; Step 6. After the truss rod group (5) is assembled, put it on hold for 10-15 days to release the stress; Step 7: Detect the relative positions of the first assembly link (3) and the second assembly link (4) by the position measuring device (2). 2. The method for assembling the truss structure of an ultra-long focal length remote sensing camera according to claim 1, wherein the assembly tool (6) has the ability to adjust six degrees of freedom to meet the requirements for adjustment accuracy in six directions.