卫星姿控系统的滑模容错控制及主动振动抑制

Fault tolerant control and vibration suppression of satellite attitude control system via higher-order sliding mode control

针对执行机构故障情况下挠性卫星姿态控制系统的容错控制及主动振动抑制问题,建立轨控推力扰动条件下含执行器故障的挠性卫星姿态控制系统模型,采用自适应控制方法设计该姿控系统的高阶滑模容错控制器,并在姿态稳定的基础上设计基于高阶滑模的补偿项以降低挠性振动对姿态精确度的影响。对轨控期间飞轮正常情形及故障情形下的挠性卫星姿态仿真结果表明,在卫星姿态控制系统存在干扰的条件下,该方法能实现对执行器故障的容错能力并能提高姿态控制精确度。

A fault-tolerant control with active vibration suppression approach was proposed for the flexible satellite attitude control system with actuator faults during orbit control. Combined with adaptive control method, a higher-order sliding mode fault tolerant attitude controller was designed for the flexible space-craft with the orbit control force disturbance,and higher-order sliding mode compensator was designed to actively suppress the induced vibration. The simulation on the flexible satellite attitude system demon-strates that this method can achieve the actuator fault tolerance and improve the attitude control precision under the condition of interference.