单框架控制力矩陀螺部分失效时的空间站姿态机动方法

对金字塔构型单框架控制力矩陀螺(SGCMG)的失效特性进行分析。结合SGCMG部分失效的特点,构建运用Legendre伪谱法的重规划姿态机动路径求解方法。考虑SGCMG失效情况的不可预测性,设计自适应操纵律,该操纵律可以根据指令力矩与输出力矩的偏差对SGCMG的失效情况进行诊断,从而调节操纵律的内部参数,实现失效情况操纵律的自适应调节。仿真结果表明,采用姿态机动路径重规划算法与自适应操纵律,在控制力矩陀螺部分失效的情况下,仍可以实现空间站的大角度姿态机动。姿态机动方法可以有效应对空间站大角度姿态机动过程中可能出现的SGCMG部分失效情况,从而提高空间站姿态机动任务的安全性与可靠性。

Space Station Attitude Maneuver Method Considering Partial Fault of SGCMG

The problem of space station attitude maneuver method considering partial fault of SGCMG (Single Gimbal Control Moment Gyroscopes) is studied in this paper. First, the fault character of pyramid configuration SGCMG is analyzed. And then, the calculation approach solving the replaned attitude maneuver path is proposed based on Legendre pseudo spectral method. Considering unpredictability of the SGCMG fault, an adaptive steering law is designed. Using this steering law, the fault state of SGCMG can be detected and the parameters of the steering law can be self-tuned. The simulation results reveal that, using the path replan method and adaptive steering law, the large angle attitude maneuver can be accomplished when SGCMG encounter partial fault. The proposed method can cope with partial fault state of SGCMG during attitude maneuver effectively, so as to improve security and reliability of the space station attitude maneuver mission.