带有时变干扰的变结构近空间飞行器滑模控制  

Sliding Mode Control for Variable Structure Near Space Vehicles with Time-Varying Composite Disturbance

作　　者：姜林 龙离军 赵军[1] JIANG Lin;LONG Lijun;ZHAO Jun(College of Information Science and Engineering, Northeastern University, Shenyang 110819, China)

机构地区：[1]东北大学信息科学与工程学院,沈阳110819

出　　处：《西安交通大学学报》2019年第3期88-96,共9页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(61773098;61773100)

摘　　要：针对近空间飞行器在执行不同任务时因结构改变导致受到的复合干扰发生改变的现象,设计了一种能够同步切换的非线性干扰观测器,并基于该切换干扰观测器采用滑模控制策略设计了切换滑模控制器。之后,考虑实际存在执行器动态的情形,提出了一种新的基于执行器动态的切换滑模控制方法,利用共同Lyapunov函数方法证明了提出方法能够保证系统的所有信号在任意切换律作用下一致有界。仿真结果表明,所设计的切换非线性干扰观测器能够有效观测未知不连续复合干扰,提出的切换滑模控制方法能够满足变结构近空间飞行器的跟踪控制要求。When variable structure near space vehicles perform different tasks, the composite disturbance changes due to the varying structures. A switched disturbance observer is designed to synchronously switch with the variable structure near space vehicle. According to the switched disturbance observer, a switched sliding mode controller is constructed with the sliding mode control strategy. Then considering the actuator dynamics in practice, a new switched sliding mode method is proposed. The common Lyapunov function method is utilized to prove that uniform boundedness of all system signals can be guaranteed under arbitrary switching rules. Simulation shows that unknown discontinuous composite disturbance can be observed effectively by the designed switched nonlinear disturbance observer, and the proposed control strategy can meet the tracking control requirement of variable structure near space vehicles. Keywords:switched nonlinear system;disturbance observer;sliding mode control;common

关 键 词：切换非线性系统 干扰观测器 滑模控制 共同LYAPUNOV函数 近空间飞行器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] V249[自动化与计算机技术—控制科学与工程]