Abstract
This paper focuses on the MANN-based intelligent adaptive fault tolerant control for a class of launch vehicles. Firstly, the attitude dynamic model of the launch vehicles suffering from the actuator faults and disturbances has been formulated. Secondly, the second-order disturbance observer has been designed for the launch vehicle to achieve the exact estimation and compensation of the time-varying disturbances. Meanwhile, the MANN has been introduced as online approximator, suppressing the adverse influence of the unknown nonlinearities. Moreover, several adaptive laws have been proposed to achieve the quick response to the actuator faults and the update of the MANN weights. As a result, the MANN-based intelligent adaptive fault tolerant control structure has been constructed for the launch vehicles. It has been proven that all the signals in the closed-loop system are bounded. Simulation results demonstrate the desired performance and the advantages of the proposed control algorithm.
Highlights
As an important medium for the development of aerospace technology, launch vehicles require high reliability and low risk
Compared with the existing work, the proposed control algorithm possesses the following advantages: (i) By using the SODO and the Memory Augmented Neural Networks (MANNs), the established control method can solve the tracking control problem of the launch vehicles suffering from timevarying actuator faults and disturbances (ii) As far as the authors know, it is the first attempt to apply the MANN to the control design of the nonlinear systems, providing a canonical form for the MANN-based intelligent control (iii) By using the proposed method, the boundaries of the disturbances and actuator faults are not required to be known in advance
Because of the disturbances and the actuator failure of the launch vehicle, the second-order disturbance observer is designed in the outer loop. e MANN is utilized to approximate and suppress the adverse effects of the unknown nonlinear part
Summary
As an important medium for the development of aerospace technology, launch vehicles require high reliability and low risk. In [18], a sliding mode fault tolerant controller based on high-order observer and differentiator is designed to achieve attitude tracking control for reusable launch vehicle. Paper [19] proposes a novel sliding mode-based fault tolerant control scheme for reusable launch vehicle under actuator fault, unknown uncertainty, external disturbances, and input limitation simultaneously. (i) By using the SODO and the MANN, the established control method can solve the tracking control problem of the launch vehicles suffering from timevarying actuator faults and disturbances (ii) As far as the authors know, it is the first attempt to apply the MANN to the control design of the nonlinear systems, providing a canonical form for the MANN-based intelligent control (iii) By using the proposed method, the boundaries of the disturbances and actuator faults are not required to be known in advance
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