Structure Design And Stability Study Of Smart Video Camera

With the development of structure integration design, space plug-and-work, electronic equipment integration, area array imaging and so on, the micro satellite with continuous observation ability has been the important direction for the development of Earth Observation Satellite. Most of the video micro satellite gets the long time and large range of the earth observation ability through the constellation deployment in low orbit. With the increase of amount, the satellite can achieve near real-time and global target observation ability, which requires not only a good video shooting capabilities, but also light weight, simple structure, easy processing and assembly, suitable for mass production, so as to reduce the cost of production, launch satellite and the satellite network. However, the state of launching satellites is different, which needs to ensure that the structure of satellites is enough stable and keep enough margin during the period of designing, in order to adapt the varieties of launching conditions. So the problem between the structure stability and the cost of satellite production becomes more prominent. The optical performance of the space camera is closely related to the thermal environment and structure stability. Therefore, it is of great significance to study the stability of camera structure.In this paper, the optical remote sensor of a smart video satellite is used as the object of study. According to the characteristics of low weight, low cost, high structure stability, suitable for mass production, the overall vibration and stability of smart video camera are studied.Firstly, the main bearing structure of the space camera is studied. According to the characteristics of smart video camera, three main bearing structures have been designed. The design scheme of the main bearing structure of the three bar is selected by the comparison of the weight, the fundamental frequency and the structural complexity. Then, the optimal design of the truss rod is carried out, and the design scheme of the main bearing structure of the smart video camera is determined by using different shapes and angles and analyzing the performance.Secondly, the static and dynamic analysis of smart video camera is carried out, and the influence of gravity on the camera’s structure and the response of camera structure in dynamic analysis are obtained. Based on this, the vibration test of the smart video camera is carried out, and according to the results of vibration test and design requirements, this paper puts forward the design requirements of the smart video camera for vibration reduction.Then, according to the characteristics of smart video camera, after comparing the three kinds of vibration damping structure, the scheme of the silicon rubber damping pad is chose. Through theoretical calculation and simulation analysis of the characteristics of the vibration damping structure, the parameters of the silicon rubber damping pad are selected. According to the results of the dynamic test, the parameters of the vibration damping structure and the damping pad are determined.Finally, the thermal sensitivity analysis of the components of smart video camera is carried out, and the effect of temperature on optical properties is obtained. The imaging capability of smart video camera in simulated space environment is verified by vacuum thermal optical test.