CN-121978830-A - Design method of flexible supporting structure of reflecting mirror

Abstract

The invention relates to the technical field of reflector support, in particular to a design method of a reflector flexible support structure, which comprises the steps of selecting a support scheme of back three-point support, decomposing the comprehensive surface shape index of a reflector into surface shape indexes under three working conditions according to the type and magnitude of environmental disturbance suffered by the reflector and the three working conditions of gravity, temperature and assembly errors of unevenness, establishing a corresponding mechanical model to obtain flexibility requirements under different working conditions, designing a topological structure of the flexible support structure according to the support scheme, the comprehensive surface shape index and the flexibility requirements, and finally analyzing whether the performance of the designed flexible support structure meets the requirements. The design method provided by the invention does not need to wait for the processing of the reflector to be finished, does not depend on the reflector body, can independently complete the design and analysis of the supporting structure, shortens the design and verification period of the supporting structure, and improves the design and production efficiency of the supporting structure.

Inventors

• JIANG PING
• WANG KEJUN
• WANG XIAOYU
• DONG JIHONG
• XUE CHUANG

Assignees

• 中国科学院长春光学精密机械与物理研究所

Dates

Publication Date

20260505

Application Date

20241031

Claims (10)

1. 1. A method of designing a flexible support structure for a mirror, comprising: S1, selecting a supporting scheme of a reflecting mirror; S2, acquiring a comprehensive surface shape index of the reflector according to the optical design parameters of the reflector; S3, decomposing the comprehensive surface shape index of the reflector into surface shape indexes under three working conditions of gravity, temperature and assembly errors of unevenness according to the type and magnitude of environmental disturbance suffered by the reflector and the flexible supporting structure; S4, establishing a mechanical model of the three working conditions of the gravity, the temperature and the unevenness in assembly errors, and respectively obtaining the flexibility requirements of the three working conditions on the flexible support structure according to the mechanical model of the three working conditions; s5, designing a topological structure of the flexible supporting structure according to the supporting scheme, the comprehensive surface shape index and the flexibility requirement.
2. 2. The method of claim 1, wherein the support scheme is a back three-point support.
3. 3. The method for designing a flexible support structure for a reflecting mirror according to claim 1, wherein in S3, the method for decomposing the integrated surface shape index is as follows: ; Wherein, the Represents the comprehensive surface shape index of the reflecting mirror, Represents the surface shape index under the gravity working condition, A profile index representing the profile under the assembly error condition of unevenness, Representing the profile index under temperature conditions.
4. 4. The method for designing a flexible support structure for a reflecting mirror according to claim 2, wherein the mechanical model of the gravity condition is: ; Wherein, the 、 And Representing the forces provided by the first, second and third support means in the back three-point support scheme, respectively, that counter the force of gravity.
5. 5. The method for designing a flexible support structure for a reflecting mirror according to claim 4, wherein the mechanical model of the assembly error condition of the unevenness is: 。
6. 6. The method for designing a flexible support structure for a reflecting mirror according to claim 5, wherein the mechanical model of the temperature condition is: 。
7. 7. the method of designing a flexible support structure for a mirror of claim 1, further comprising first order frequencies of components of the flexible support structure And (3) performing estimation: 。
8. 8. The method for designing a flexible support structure for a reflecting mirror according to claim 1, further comprising performing surface shape superposition analysis on the surface shape indexes under the three working conditions by an inertia release method, verifying the accuracy of the mechanical model, and obtaining an axial support position and a neutral plane position of the flexible support structure.
9. 9. The method of claim 1, further comprising calculating compliance of the designed flexible support structure under the three operating conditions, and determining whether the compliance of the designed flexible support structure meets compliance requirements of the three operating conditions for the flexible support structure.
10. 10. The method of claim 9, further comprising performing a statics and dynamics analysis on the designed reflector and flexible support structure to determine whether the performance of the three conditions meets the profile index requirement.

Description

Design method of flexible supporting structure of reflecting mirror Technical Field The invention relates to the technical field of reflector support, and particularly provides a design method of a reflector flexible support structure. Background With the continuous development of space technology, the requirement on the resolution of the space telescope is continuously improved, and the large caliber and the long focal length become the main trend of the space telescope. As the caliber of the reflector is larger and larger, the mass of the reflector is also greatly increased, so that the reflector needs to be designed in a light-weight manner, but the rigidity of the reflector is reduced while the weight of the reflector is reduced, so that the reflector is easily influenced by external environment disturbance. The space reflector is supported to position the reflector and also plays a role in isolating or correcting disturbance of external environment, so that the influence on the surface shape of the mirror is reduced, and the space reflector has enough rigidity to resist rocket launching load. How to ensure the performance of the large caliber mirror assembly is a difficulty in the design of the mirror support. The external environment disturbance mainly comprises gravity, assembly error, temperature change and the like, the structural stability is related to the fundamental frequency of the mirror assembly, the structural creep or damage caused by overlarge vibration stress in the rocket launching process can be prevented by improving the frequency of the mirror assembly, and the relative position between optical elements is ensured. Support designs meeting the above-mentioned many requirements require multiple iterations and long design cycles, and therefore, it is very necessary to study high-performance flexible support topologies and flexible support rapid optimization methods. In the traditional flexible support design method, the design process mainly depends on finite element simulation of a mirror structure to evaluate whether the design meets index requirements, and the performance verification of the support structure completely depends on the mirror body and cannot be independently completed, so that the period of designing and verifying the mirror assembly is long. The processing period of part of the large-caliber reflector can be in a year unit, if the processing of the reflector is completed and then the verification of the supporting structure is carried out, once the performance does not meet the requirement, the loss in period and cost can not be estimated, if the association between the reflector and the flexible support can be decoupled in the design stage, the design efficiency of the flexible support can be effectively improved, meanwhile, the design of the supporting structure is more purposeful by extracting the decoupled flexible support index, the design iteration times and the design period are reduced, the verification period is shortened, and the development period of the large-scale space camera can be greatly reduced. Disclosure of Invention The invention provides a design method of a flexible supporting structure of a reflector, which is used for designing the flexible supporting structure according to design data of the reflector, and does not need to wait for finishing processing of the reflector, so that the period is shortened, and the production efficiency of the flexible supporting structure is improved. The invention provides a design method of a reflector flexible supporting structure, which comprises the following steps: S1, selecting a supporting scheme of a reflecting mirror; S2, acquiring a comprehensive surface shape index of the reflector according to the optical design parameters of the reflector; S3, decomposing the comprehensive surface shape index of the reflector into surface shape indexes under three working conditions of gravity, temperature and assembly errors of unevenness according to the type and magnitude of environmental disturbance suffered by the reflector and the flexible supporting structure; S4, building a mechanical model of three working conditions of assembly errors of gravity, temperature and unevenness, and respectively obtaining the flexibility requirements of the three working conditions on the flexible support structure according to the mechanical model of the three working conditions; S5, designing a topological structure of the flexible supporting structure according to the supporting scheme, the comprehensive surface shape index and the flexibility requirement. Preferably, the support solution is a back three-point support. Preferably, in S3, the decomposition method of the comprehensive surface shape index is as follows: ; Wherein, the Represents the comprehensive surface shape index of the reflecting mirror,Represents the surface shape index under the gravity working condition,A profile index representing the profile under th