北京航空航天大学学报 ›› 2008, Vol. 34 ›› Issue (11): 1272-1275.

• 论文 • 上一篇    下一篇

基于扩张状态观测器的飞轮故障检测与恢复

金 磊, 徐世杰   

  1. 北京航空航天大学 宇航学院, 北京 100191
  • 收稿日期:2007-11-28 出版日期:2008-11-30 发布日期:2010-09-16
  • 作者简介:金 磊(1982-),女,云南昆明人,博士生,jinleibuaa@163.com.

Extended state observer-based fault detection and recovery for flywheels

Jin Lei, Xu Shijie   

  1. School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2007-11-28 Online:2008-11-30 Published:2010-09-16

摘要: 飞轮是卫星姿态控制系统中的主要执行部件,实现其自主故障检测与恢复对于维持卫星正常姿态具有很重要的意义.在建立了精确飞轮开环系统模型的基础上,设计了二阶非线性连续扩张状态观测器ESO(Extended State Observer).将飞轮故障视为系统外扰,并假设其余外扰是小量可忽略,则利用此ESO不仅能实时得到飞轮开环系统的状态量,当飞轮发生故障时更能快速准确地估计出故障量.因而无需产生系统残差即可直接进行故障检测,同时根据故障量的大小对系统输入即驱动电压进行补偿,使飞轮转速仍能维持正常值,保证卫星姿态不受故障影响.数值仿真验证了此方法的有效性.

Abstract: Flywheels are main actuators of satellite attitude control systems, and fault detection and recovery of flywheels is significant on keeping the normal satellite attitude. A high fidelity open-loop system of flywheel was modeled and the second order nonlinear continuous extended state observer(ESO) was established via the nonlinear model. Under the assumption that the system external disturbances are minor and are neglected, fault in flywheel was regarded as the main system external disturbance. Therefore, by using ESO, not only the system state was obtained, but also the fault was estimated with exactness and swiftness. With the fault obtained, fault detection was accomplished without generating system residual, and fault recovery was also achieved by compensating the system input voltage, which ensures the normal flywheel speed and satellite attitude. The simulation results demonstrate the validity of this scheme.

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