带有饱和受限的挠性卫星变结构姿态容错控制  

Variable-structure fault-tolerant attitude control for flexible satellite with input saturation

作　　者：霍星[1,2] 胡庆雷[2] 肖冰[2] 马广富[2] 

机构地区：[1]渤海大学工学院,辽宁锦州121000 [2]哈尔滨工业大学控制科学与工程系,黑龙江哈尔滨150001

出　　处：《控制理论与应用》2011年第9期1063-1068,共6页Control Theory & Applications

基　　金：国家自然科学基金资助项目(60774062);高等学校博士学科点专项科研基金资助项目(20070213061);黑龙江省留学回国人员科学基金资助项目(LC08C01);哈尔滨市科技创新人才研究专项基金资助项目(2010RFLXG001);中央高校基本科研业务费专项基金资助项目(HIT.NSRIF.2009003);辽宁省高校科研计划基金资助项目(L2010009)

摘　　要：针对挠性卫星在飞行过程中存在推力器故障、控制输入饱和受限以及外部干扰的姿态控制问题,提出了一类基于变结构控制的鲁棒容错控制设计方法.该设计在继承变结构控制的优点的同时,显式地引入推力器输出的饱和幅值,以确保控制输出在其要求界的范围内.同时,充分利用星上推力器的硬件冗余以实现对部分推力器故障的容错,这种思想的引入使得所设计的控制器对故障具有很强的自适应能力,而且对设计者而言,推力器故障信息不需要进行在线的检测和分离.最后,将该控制器应用于某型卫星姿态调节控制,仿真结果表明该控制器能有效地抑制外部干扰、挠性结构的振动和推力器故障的约束,在实现姿态调节的同时,保证其控制输出满足饱和受限界的要求,具有较好的控制性能.The variable-structure fault-tolerant attitude control system is investigated for an orbiting three-axis stabilized flexible satellite with redundant thrusters.In this system the thruster failures,the control-input saturation and external dis-turbances are explicitly considered simultaneously.In the proposed controller,a single parameter is dynamically adjusted,independent of the fault detection and mechanism isolation;only the remaining active thrusters are required to be able to produce a sufficient combined force to maintain the satellite in operation for performing the given tasks.By explicitly considering the saturation magnitude of the available control input to the thruster,we develop a direct relation between this magnitude and those of the desired trajectories and disturbances in continuous control.Lyapunov stability analysis shows that the closed-loop system is stable;and the effect of the external disturbances and faults can be reduced by appropriately choosing the design parameters.Numerical examples show that the proposed control algorithms are robust to external disturbances,and are able to handle thruster failures under a limited value of saturation.

关 键 词：挠性卫星 变结构控制 容错控制 输入饱和 推力器故障 

分 类 号：V448.2[航空宇航科学与技术—飞行器设计]