Optimal Design Of The Main Support Structure Of Ultra-light Space Camera

The rapid development of space remote sensing has played a more important role in many fields such as national economy,people's livelihood and national defense and security.Remote sensing applications in the new era put more stringent requirements on optical payload,and an urgent need is for high resolution and lightweight remote sensing satellites.High-resolution and lightweight remote sensing system have higher accuracy requirements for the optical components.The main supporting structure is a key used to fix each optical element and ensure the position accuracy.Research on the main supporting structure technology of ultra-light and stable payload is one of the most important technical problems in the ultra-light space camera.In this paper,an ultra-light and high stability main support structure was designed for a micro-space camera.And completed its optimization design,from the material selection,structure topology,size optimization.Comparison and selection of space camera main support structure commonly used material properties.Finally,the SiC/Al material with higher specific stiffness and excellent thermal performance was selected for the design of the micro-payload main support structure.Three main support structure schemes are designed,combining with the structural design requirements of the ultra-light space camera and the characteristics of the optical system.The optimized design of the three schemes has been completed,with the fundamental frequency as the constraint and the minimum weight as the target.Perform engineering analysis on the optimized structure,and the performance of three different main support structures are compared.An integrated main support structure combining thin-walled tube and support rod is proposed.And the initial model of the combined main support structure and the main support structure are established respectively.The integrated optimization method is used to study the multi-objective size optimization design of the composite main support structure with the weight and kinetic parameters as thegoal.Complete the size optimization of the main support structure to the base frequency and weight for optimization goal,set modeling,analysis,calculation,optimization in one.After completing the design of the main support structure,the sine and random responses of the camera system were analyzed to verify the rationality of the optimized design method.The prototype with micro-payload was developed and the dynamic experiments were carried out.The modal shape of the prototype and the acceleration responses of sine and random vibration were obtained to verified the dynamic performance of whole machine.The results show that the ultra-light main support structure designed in this paper can ensure the stability of the whole machine and the position accuracy of each optical component.The comparison between the experimental and simulation results shows the accuracy of the FEM analysis,and verifies the correctness of the optimization design and analysis method in this paper.