Closed-Loop Based Control Allocation for Spacecraft Attitude Stabilization with Actuator Faults

2021 ◽  
pp. 185-217
Author(s):  
Qinglei Hu ◽  
Bo Li ◽  
Bing Xiao ◽  
Youmin Zhang
Keyword(s):  
Closed Loop ◽  
Control Allocation ◽  
Spacecraft Attitude ◽  
Actuator Faults ◽  
Attitude Stabilization

Robust Fault Tolerant Control for Spacecraft Attitude Stabilization Under Actuator Faults and Bounded Disturbance

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
Bing Xiao ◽  
Qinglei Hu ◽  
Michael I. Friswell
Keyword(s):  
Closed Loop ◽  
Fault Tolerant ◽  
Fault Detection And Isolation ◽  
Spacecraft Attitude ◽  
Actuator Faults ◽  
Closed Loop System ◽  
External Disturbances ◽  
Attitude Stabilization ◽  
Bounded Disturbance ◽  
Loss Of Actuator Effectiveness

This paper investigates the design of spacecraft attitude stabilization controllers that are robust against actuator faults and external disturbances. A nominal controller is developed initially, using the adaptive backstepping technique, to stabilize asymptotically the spacecraft attitude when the actuators are fault-free. Additive faults and the partial loss of actuator effectiveness are considered simultaneously and an auxiliary controller is designed in addition to the nominal controller to compensate for the system faults. This auxiliary controller does not use any fault detection and isolation mechanism to detect, separate, and identify the actuator faults online. The attitude orientation and angular velocity of the closed-loop system asymptotically converge to zero despite actuator faults providing the nominal attitude system is asymptotically stable. Numerical simulation results are presented that demonstrate the closed-loop performance benefits of the proposed control law and illustrate its robustness to external disturbances and actuator faults.

scholarly journals Robust Control Allocation for Spacecraft Attitude Stabilization under Actuator Faults and Uncertainty

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Aihua Zhang ◽  
Yongchao Wang ◽  
Zhiqiang Zhang ◽  
Hamid Reza Karimi
Keyword(s):  
Robust Control ◽  
Controller Design ◽  
Control Allocation ◽  
Spacecraft Attitude ◽  
Actuator Failure ◽  
Partial Loss ◽  
Detection Scheme ◽  
Attitude Stabilization ◽  
Attitude Tracking ◽  
Unknown Disturbances

A robust control allocation scheme is developed for rigid spacecraft attitude stabilization in the presence of actuator partial loss fault, actuator failure, and actuator misalignment. First, a neural network fault detection scheme is proposed, Second, an adaptive attitude tracking strategy is employed which can realize fault tolerance control under the actuator partial loss and actuator failure withinλmin⁡=0.5. The attitude tracking and faults detection are always here during the procedure. Once the fault occurred which could not guaranteed the attitude stable for 30 s, the robust control allocation strategy is generated automatically. The robust control allocation compensates the control effectiveness uncertainty which caused the actuator misalignment. The unknown disturbances, uncertain inertia matrix, and even actuator error with limited actuators are all considered in the controller design process. All are achieved with inexpensive online computations. Numerical results are also presented that not only highlight the closed-loop performance benefits of the control law derived here but also illustrate its great robustness.

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