長焦距寬視場空間相機主支撐結構優(yōu)化設計
[Abstract]:The off-axis three-mirror optical system is widely used as an optical system for space cameras because of its large field of view, high resolution and close to ideal imaging performance and effect. However, due to the asymmetric characteristics of its optical system, its supporting structure design and adjustment technology is generally recognized as a technical difficulty compared with the coaxial symmetric system. In addition, in order to realize the large width and high ground resolution of the space camera and the integration of the detailed survey function, it is necessary to continuously increase the focal length and field of view angle of the optical system. The position accuracy of each optical component is more strict, and the dimensional stability of the space camera in the process of installation, transportation and launch is more difficult to maintain, which brings great challenges to the design of the main supporting structure. In this paper, the main, third, folding mirror length is over 1200mm, the aspect ratio is more than 3: 1, the mass is more than 40kg, the distance between primary and secondary mirrors is more than 1500mm, according to the space camera of an off-axis three-mirror system, the length of folding mirror is more than 1200mm, the ratio of length to width is more than 3: 1. The optimization design and mechanical properties of the main support structure of the large off-axis three-counter space camera are studied in the following five aspects. This paper investigates the typical forms of the main support structure of off-axis space camera at home and abroad. In view of the characteristics of high resolution and wide field of view off-axis three-mirror optical system, the advantages and disadvantages of different supporting modes are analyzed, and the main support structure form .2suitable for this thesis is selected. Study on topological form of Truss structure. According to the variable density method, the multi-objective topology optimization design of the truss bracing structure studied in this paper is carried out, and the suitable truss initial structure is designed, and the initial structure is divided into various sub-structures. The influence of truss bar angle on the performance of substructure truss is studied. Research on Optimization Design of Front frame structure. According to the characteristics of optical system, the front frame structure of integrated supporting folding mirror and secondary mirror assembly is presented. First of all, according to the processing technology and the size requirements of the front frame, through the analysis and comparison of the different engineering materials commonly used in aerospace, the titanium alloy is selected as the development material of the front frame. According to the defect that there is no relation between constraint points in the method of modal topology optimization based on constraints, a new topology optimization method based on free mode and constraint mode is proposed to optimize the lightweight form of frame structure before design. The free mode analysis and MIMO free mode test of the developed front frame structure are carried out, and the correctness of the optimization and analysis method is verified. Optimization design of truss rod size based on dynamic objective. Based on the theory of random vibration, the assumption that strengthening the stiffness of the local region can reduce the random vibration response of the region is proposed. According to this viewpoint, a multi-objective dimension optimization method based on the minimum random vibration response of the mirror mounting point is proposed to optimize the size of the truss bar in this paper. The static mechanical analysis and test are carried out through the force and heat sample maneuver of the truss structure. The rationality of the design method is verified, and the correctness of the theoretical hypothesis proposed in this paper is verified. Heat dissipation design of truss structure. The characteristics of thermal deformation of off-axis space camera truss structure are studied. According to the principle of equal axial distance of truss bar after thermal deformation, the function relation of thermal expansion coefficient of each truss is calculated according to the requirement of optical tolerance. The range of thermal expansion coefficient of truss rod is calculated, and according to the design characteristics of thermal expansion coefficient of carbon fiber composite material, two factors, stiffness and coefficient of thermal expansion, are integrated. A lamination method of carbon fiber composite material for truss bar was designed to meet the performance requirements.
【學位授予單位】:中國科學院長春光學精密機械與物理研究所
【學位級別】:博士
【學位授予年份】:2017
【分類號】:V445.8
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