反作用轮系统内干扰建模与仿真分析

Inner Disturbance Modeling and Simulation Analysis of Reaction Wheel System

反作用轮在卫星姿态控制中得到广泛应用;但对于指向精度要求高的任务,必须充分考虑反作用轮本身引入的干扰,即反作用轮系统的内干扰。首先建立了反作用轮系统的内干扰数学模型,包括摩擦干扰、弹性振动干扰及飞轮质量分布不均引入的干扰,以此为基础,在MATLAB/Simulink环境下建立了相关的仿真模型,并将其应用到卫星三轴稳定姿态控制动力学仿真中。

Nowadays, reaction wheels are widely used as attitude control actuators in space missions that require fine pointing accuracy and stabilization. But the inner disturbances introduced by the reaction wheel assembly （RWA） itself are among the most significant ones. These include bearing frictions, flywheel imbalance, structural vibrations, etc. The mathematical models of the reaction wheel with such characteristics were presented. And the associated computer models were implemented in the MATLAB/Simulink environment. Then the models were applied to a satellite attitude dynamics simulation, with the assumption that the satellite was working in a three-axis stability mode. The numerical results show that the RWA disturbances are significant.