Fault‐tolerant spacecraft attitude control under actuator saturation and without angular velocity

2019 ◽  
Vol 29 (18) ◽  
pp. 6483-6506 ◽  
Author(s):  
Xianghua Wang ◽  
Chee Pin Tan
Keyword(s):  
Angular Velocity ◽  
Attitude Control ◽  
Actuator Saturation ◽  
Fault Tolerant ◽  
Spacecraft Attitude ◽  
Spacecraft Attitude Control

Robust fault-tolerant attitude control of spacecraft using hybrid actuators

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yiqi Xu
Keyword(s):  
Attitude Control ◽  
Actuator Saturation ◽  
Fault Tolerant ◽  
Spacecraft Attitude Control ◽  
External Disturbances ◽  
Content Type ◽  
Virtual Control ◽  
Smooth Switching ◽  
High Level ◽  
Hybrid Actuator

Purpose This paper aims to address the spacecraft attitude control problem using hybrid actuators in the presence of actuator saturation, uncertainties and faults, inertia uncertainties and external disturbances. Design/methodology/approach A hybrid actuator configuration is used where thrusters are engaged for rapid attitude maneuvers, while reaction wheels (RWs) are used for fine pointing. Findings The key advantages are two-fold: a finite-time high-level controller is designed to produce the three-axis virtual control torques; an online robust control allocation (RobCA) scheme is proposed to redistribute virtual control signals to the actuators with taking into account the actuator saturation, uncertainties and faults; and the RobCA scheme allows a smooth switch between thrusters and RWs, which handles the inaccuracy problem of thrusters and saturation problem of RWs. Practical implications An online RobCA algorithm is designed that maps the total control demands onto individual actuator settings and allows a smooth switch between thrusters and RWs. Simulation results show the effectiveness of the proposed control strategy. Originality/value This work may be used on modern space missions, which impose higher requirements on smooth switching of spacecraft thrusters and RWs.

Sign in / Sign up

Export Citation Format

Share Document