Configuration Optimization And Key Component Reliability Analysis Of Composite Posture Docking Test Platform

With the vigorous development and progress of aerospace technology,the space mission carried by spacecraft is becoming more and more complicated and diversified.The most effective way to ensure the high docking successful rate of the pre-launched spacecraft and the on orbit spacecraft or space station is to carry out experimental study on docking process by ground docking simulation test platform.At present,more mature docking test rigs are all single docking mode,which can not conduct comprehensive docking test for spacecraft and is not in accordance with the complex and varied mission requirements.This paper aimed at the configuration optimization of composite posture docking test platform,the kinematics analysis and the pose error model of the motion simulator,and the structural reliability analysis of its key parts.The composite posture docking test platform needs to realize the vertical and the horizontal two docking modes,and can carry on the nimble transformation in each docking mode.In this paper,finite element analysis and numerical calculation method are used to analyze the structural and dynamic defect of the frame structure 、 the conversion mechanism of the main motion simulator and the balance assembly of core shaft.According to the analysis results,the corresponding parts are optimized,which makes the function and performance of the composite posture docking test bench more perfect.In order to analyze the pose error of the compound attitude docking test platform,the whole coordinate system of the test platform is established and the kinematics analysis of the main and passive motion simulator is carried out.Comprehensive considering the factors that affect the pose accuracy of the test platform,the pose error model of the active and passive motion simulator isestablished respectively.Combined with the characteristics of three claw type docking mechanism,the contact type of active and passive docking mechanism during docking process is analyzed,the contact impact force and moment model were established,the dynamic characteristics of composite posture docking test platform during the docking process is analyzed.The limit of the initial conditions were selected on collisions and docking two kinds of oblique collision case,through ADAMS conducted a joint simulation test bench with the docking mechanism,and the contact force curve is obtained.Finally,based on the theory and method of reliability analysis,the limit function of structural reliability is established.The structural reliability analysis of the key parts of composite posture docking test platform such as core shaft and joint ball was carried out by using the ANSYS/PDS function module combined with Monte Carlo method.The reliability analysis results of key components are obtained,and the reliability level of key components is proved.