%0 Journal Article
%T Adaptive Prescribed Performance Control for Flexible Spacecraft with Input Saturation and Actuator Misalignment
%A Jiawei Tao
%A Tao Zhang
%A Yongfang Nie
%J 清华大学学报自然科学版（英文版）
%@ 1878-7606
%D 2019
%R 10.26599/TST.2018.9010094
%X 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
%K flexible spacecraft
%K modal observer
%K vibration suppression
%K prescribed performance
%K input saturation
%K actuator misalignment
%U http://tst.tsinghuajournals.com/EN/10.26599/TST.2018.9010094