flexible spacecraft, modal observer, vibration suppression, prescribed performance, input saturation, actuator misalignment
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.
Tsinghua University Press
Jiawei Tao, Tao Zhang, Yongfang Nie. Adaptive Prescribed Performance Control for Flexible Spacecraft with Input Saturation and Actuator Misalignment. Tsinghua Science and Technology 2019, 24(06): 694-705.