scholarly journals Active Fractional-Order Sliding Mode Control of Flexible Spacecraft Under Actuators Saturation

2021 ◽  
Author(s):  
milad alipour ◽  
Maryam Malekzadeh ◽  
alireza ariaei
Keyword(s):  
Fractional Order ◽  
Attitude Control ◽  
Vibration Suppression ◽  
Sliding Mode ◽  
Fixed Time ◽  
Flexible Spacecraft ◽  
Terminal Sliding Mode ◽  
Damping Matrix ◽  
Active Vibration Suppression ◽  
Active Vibration

Abstract In this article, a novel multi-purpose modified fractional-order nonsingular terminal sliding mode (MFONTSM) controller is designed for the flexible spacecraft attitude control and appendages passive vibration suppression, assuming the control torque saturation in the system dynamics. Furthermore, an active FONTSM controller is proposed separately to perform active vibration suppression of the flexible appendages using piezoelectric actuators. The fixed-time stability of the closed-loop system for both the passive and active controllers is analyzed and proved using the Lyapunov theorem. Finally, the performance of the proposed controllers has been tested in the presence of uncertainties, external disturbances, and the absence of the damping matrix in order to study the effectiveness of the proposed method.

scholarly journals Agile Attitude Maneuvers with Active Vibration-suppression for Flexible-spacecraft

2021 ◽  
Author(s):  
Zhang Jianqiao ◽  
Xianglong Kong ◽  
Chuang Liu ◽  
Qing Deng
Keyword(s):  
Vibration Suppression ◽  
Sliding Mode ◽  
Lyapunov Stability Theory ◽  
Flexible Spacecraft ◽  
Robust Controller ◽  
Adaptive Sliding Mode Controller ◽  
Control Moment ◽  
Active Vibration Suppression ◽  
Active Vibration ◽  
The Stability

Abstract This paper addresses the agile attitude stabilization maneuver control of flexible-spacecraft using control moment gyros (CMGs) in the absence of modal information. Here, piezoelectric actuators are employed to actively suppress the vibration of flexible appendages. Both the attitude dynamics and the proposed robust controller are globally developed on the Special Orthogonal Group SO(3), avoiding ambiguities and singularities associated with other attitude representations. More specifically, an observer is first designed to estimate the modal information of vibration. A robust control law is developed by synthesizing a proportional derivative (PD) controller, an adaptive sliding mode controller, and an active vibration-suppression controller, which use the information of the estimated structural modes. The stability of the closed-loop system is proved using Lyapunov stability theory. Finally, numerical examples are performed to show the effectiveness of the proposed method.

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