Research On Multi-dimensional Adjustment Device For Secondary Mirror Of Space Remote Sensor

When the space remote sensor is launched into space from the Earth, due to vibration, temperature changes, gravity release, air pressure change and other factors, the relative position and orientation relationship between the components of the optical facilities may change. Among them, the change of relative position and orientation relationship between the primary mirror and the secondary mirror has a large influence on the imaging performance of the optical system, so the adjust link is needed to correct it. Because the primary mirror assembly’s size and weight are generally larger, it is not adjusted for the majority of the optical system, and the adjusted link is set on the secondary mirror to correct the optical offset. The change of relative position and orientation relationship between the primary mirror and the second mirror is so complex that the secondary mirror adjustment mechanism should be multi-dimensional adjustment. Through the investigation of foreign space remote sensor secondary mirror adjustment program, considering the requirement of the secondary mirror adjustment, it is determined that this paper use the 6-UPS parallel mechanism as a multi-dimensional adjustment device for secondary mirror.According to the geometry characteristics of the multi-dimensional adjustment device for secondary mirror, the inverse kinematics model that the adjustment center is the center of the secondary mirror is built, the speed and acceleration model is also built. Based on the inverse kinematics model, Newton iterative method is used to solve the forward kinematics of the multi-dimensional adjustment device for secondary mirror. Through the mutual authentication of the forward and inverse kinematics model, it is proved that the forward kinematics solution method is effective.Through the multi-dimensional adjustment device for secondary mirror stress analysis, we use the Newton-Euler method construct the dynamics equation. According to the dynamics equation, Base on MATLAB/Simulink simulation environment, the multi-dimensional adjustment device for secondary mirror dynamics simulation model is constructed. The forward and inverse dynamics are solved by PD feedback control.Base on the 6 multi-dimensional adjustment device for secondary mirror inverse kinematics, the error model is constructed by the total differential method. Through the error model, we can know that the pose error comes from the 6 leg length errors and 12 hinge centers position errors, total 42 error terms. The distribution of the multi-dimensional adjustment device for secondary mirror pose errors can be analyzed by Monte Carlo simulation.Through the research on the multi-dimensional adjustment device for secondary mirror kinematics parameters identification, a fast and effective method of parameters identification is given, and the correspondence relationship between the parameter identification’s accuracy and measuring equipment’s precision outside.