Deploying Process Simulation And Analysis Of Deployable Spaceborne Antenna

Simulation analyses of complex mechanical system using computer is an important auxiliary method of mechanical design because of the rapid development of computer technology and constant grown up of multi-body system dynamics theory. The simulation analysis of a new deployable antenna named spaceborne folded hoop and rib scheme is carried out in this paper, and its locking and driving forms are improved according to simulation results.Firstly, a dynamic model of folded hoop and rib scheme with a 3m aperture is constructed with multi-body system dynamics used software of SIMPACK. In order to get motion parameters and force conditions in deployment process, its simulation analyses are carried out both in a normal state and in a bias state ,and dynamic analyses of flexible multi-body are presented with Finite Element software of ANSYS. The result shows that the antenna can be deployed normally both in two states, but the deployment is intense, the stationarity of deployment is not high, and the synchronism need to be improved in a bias state. Meanwhile, the oscillation phenomenon exists during deployment when the function of member bars'flexibility is considered.Secondly, a detailed dynamic model of joint is constructed and simulation analysis of locking process is carried out based on the above simulations. The result shows that the reliability is not high. Aiming at this problem above, a new locking scheme is proposed and verified in the form of software simulation. The simulation result shows that the new scheme has simple structure and high reliability, but its locking accuracy needs to be improved.At last, a new driving scheme named pulling rope driving is proposed in order to solve low stationarity through torsion spring driving during deployment process. The simulation of joint's deployment process is carried out by using ADAMS. The result shows that the joint can be deployed normally with the new scheme, and its deployment development is stable and controllable.The simulation analyses of deployment process of folded hoop and rib scheme validate the feasibility of new structure deploying, predicts some problems in the deployment process, and provides a valuable reference for research on large spaceborne deployable mechanism.