Structure Optimization And Isolating Performance Analysis Of Spaceborne Camera Isolator

In the process of spaceborne camera launching into a predetermined orbit, suffering a variety of quasi-static loads and dynamic loads, such as heat load, dynamic overload, vibration, noise and shock, the mechanical environment is very severe. Traditional design methods tend to increase the cost of the volume and weight in exchange for the stability of the satellite platform and camera, which contradicts the small, lightweight, precision development trend of spacecraft. An effective way to solve the above problem is based on the dynamic performance of camera structure and the disturbance environment of satellite platform, developed a special high-performance camera isolator and isolation system, make the camera not be damaged under the strong vibration of the rocket launching, to provide protection for its stable work.To ensure that the space camera can withstand the vibration environment of the rocket launching process, with a preliminary design of the camera isolator as the research object, first it carries on the theoretical analysis and the parameter derivation, then established the finite element model of the camera isolator and isolation system, and carried out the modal calculation and vibration response analysis, which indicates the necessity of the structure optimization of the isolator. According to the actual structural characteristics of the isolator, first explored the influence of damping material parameters and structural style of the damping on the vibration characteristics, after adopting the orthogonal design combined with the method of finite element analysis, detailedly studied the effects of isolator’s six structural parameters on the vibration characteristics, makes clear the importance of each factor, and to provide the reference for further precise optimization design.Based on the basic principles of response surface method, using the experimental design method of orthogonal design combining with uniform design, carried out the approximate modeling to camera isolator, established the approximate mapping relationships between isolator’s six structural parameters and the first three modal frequencies, damping ratios. And carried out the error analysis and sample test to the approximate model, verified the rationality of the model.The multi-objective genetic algorithm is employed to the isolator’s structure optimization, through carrying out the corresponding mechanical strength check and vibration isolation performance analysis to the optimization of isolator and its components camera vibration isolation system, verified the final camera isolator can be used for vibration isolation during the launch phase of satellite camera, and can guarantee the better effect. In addition, the method of experimental design-approximate model-optimization is used to the structure optimization of isolator in this thesis, may have some reference value to similar structure optimization problems.