Design And Implementation Of Control Systems Of Three Dimensional Flexible Appendage Simulator

The vibration of the flexible appendages on the spacecraft, which has important significance for the spacecraft body is researched by the ground physical simulation effectively. In order to effectively analyze and verify the characteristic of the flexible appendages on the spacecraft in the ground simulation system, a flexible accessory simulator is designed in this paper. The device can guarantee the smooth implementation of the ground physical simulation. Therefore, the research on flexible accessory simulator has important theoretical and practical value.In this work a kind of flexible accessory simulator is purposed by studying the influence of the flexible appendages on the spacecraft body. It can be used in the physical ground simulation system of a spacecraft with flexible appendages. This device can simulate the disturbance torque which is caused by the deformation of the flexible appendages on the spacecraft.First of all, the development of the flexible attachment on the spacecraft is discussed. By introducing the current and relevant research at home and abroad, we can see that it is to very necessary to design a simulator of flexible accessories within considering the influence of the flexible appendages on the spacecraft.Secondly, the dynamic model of spacecraft system and the air bearing platform with flexible appendages are established. Through the comparison and analysis of the two models, it is concluded that an active torque vibration simulator can be designed to realize the simulation of the disturbance torque. This demonstrates the feasibility of the scheme of flexible accessories simulator from the perspective of theory.Then the mathematical model of active flexible accessory simulator with actuator is also derived. Three control algorithms are applied to the established model, such as PID, fuzzy control and sliding mode control. Through mathematical simulation and analysis, the sliding mode control algorithm based on exponential reaching law is the most suitable for the control system of the simulator.Finally, the design and implementation of the simulator are discussed from the perspective of hardware and software. The performance of the simulator is tested, and the validity and practicability of the three dimensional flexible accessories simulator are verified.