Microgravity System Of Space Load Transfer Mechanism Design And Research

With the rapid development of space industry,the requirement of material transfer capability between different spacecraft,such as spacecraft and space station,is getting higher and higher.In microgravity environment,as an important bridge for material exchange between spacecrafts,the reliability and stability of space load transfer mechanism play a decisive role in the design of load transfer mechanism.Therefore,before the load transfer mechanism enters outer space,the ground simulation test of the transfer mechanism is very important In order to better simulate the weightlessness environment in outer space and complete the test of ground simulation equipment,it is of great significance to develop a suitable microgravity balance system on the ground.Aiming at the ground simulation verification of a new set of space load transfer mechanism developed by the 8th Research Institute of China Aerospace Science and Technology Group,and considering the structural characteristics of the space load transfer mechanism and the accuracy requirements of gravity balance,a set of micro-gravity system of space load transfer mechanism is designed in this paper.The main research contents are as follows:(1)Summarizing the research status of microgravity simulation methods at home and abroad,and based on the structural characteristics and motion characteristics of space load transfer mechanism,through the comparison of advantages and disadvantages of each methcd,the passive follower flexible suspension gravity balance method is optimized to design microgravity system.(2)The error source of the flexible suspension gravity balance system is analyzed,and the mathematical model of the gravity balance error is established.The configuration and structure of the flexible suspension gravity balance system are optimized by theoretical calculation model.The optimized gravity balance accuracy of the suspension system can meet the requirements of ground simulation test(3)The concrete structure of the hanging gravity balance system is designed,and the finite element simulation calculation of the important components is carried out The strength,stiffness and deformation of the important components in the microgravity system are checked and analyzed,and the strength and deformation of the important components meet the design accuracy requirements.The overcentroid hanging tooling is designed to make the flexible hanging force over the centroid of the structure and reduce the additional disturbance error(4)Establish the mathematical model of deflection error caused by different arrangement of hanging points in flexible-lock hanging gravity balance system,and optimize the structure of flexible-lock hanging system.Based on the angle coupling equation of D-H angular encoder and the dynamic model of D-H angular encoder,the optimum mathematical model of suspension system is established by using MATLAB simulation software,and the deflection error of suspension system is simulated by ADAMS,which further verifies the optimization results.(5)The weightlessness accuracy of the flexible suspension gravity balance system was verified by experiments.The results of multi-condition experiments show that the designed space load transfer mechanism microgravity system meets the test requirements.