Adaptive Prescribed Performance Control for Flexible Spacecraft with Input Saturation and Actuator Misalignment

作     者：Jiawei Tao Tao Zhang Yongfang Nie 

作者机构：Department of AutomationTsinghua UniversityBeijing 100084China Department of Strategic Missile and Underwater WeaponNaval Submarine AcademyQingdao 266071China 

出 版 物：《Tsinghua Science and Technology》 (清华大学学报（自然科学版（英文版）)

年 卷 期：2019年第24卷第6期

页      面：694-705页

核心收录：

学科分类：07[理学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 61703228 and 61673239) 

主　　题：flexible spacecraft modal observer vibration suppression prescribed performance input saturation actuator misalignment 

摘      要：In this paper, a flexible spacecraft attitude control scheme that guarantees vibration suppression and prescribed performance on transient-state behavior is proposed. Here, parametric uncertainty, external disturbance, unmeasured elastic vibration, actuator saturation, and even configuration misalignment are considered. To guarantee prescribed performance bounds on the transient-and steady-state control errors, a performance constrained control law is formulated with an error transformed function. An elastic modal observer is employed to estimate the unmeasured flexible modal variables, and a command filter is adopted to avoid the tedious analytical computations of time derivatives of virtual control inherent in the control design. Subsequently, a novel auxiliary system is developed to compensate the adverse effects of the actuator saturation constraints, and a compensation term is integrated into the control law to tackle the configuration misalignment. A comparative simulation study is carried out to illustrate the effectiveness and advantages of the proposed approach.