Adaptive actuator fault-tolerant control for non-minimum phase air-breathing hypersonic vehicle model. (July 2022) - Wang, Le
Abstract: In this paper, the tracking control problem of non-minimum phase flexible air-breathing hypersonic vehicles (AHSV) is investigated subject to actuator fault, external disturbances and parameters uncertainties. The study is began with a series of control-oriented manipulations: first, the input–output dynamics are derived by using feedback linearization method and the internal dynamics of AHSV are constructed; then, the zero dynamics stability analysis is conducted to verify the non-minimum phase characteristic of AHSV. In order to realize output tracking of the non-minimum phase system with sufficient accuracy, an adaptive fault tolerant controller (FTC) is proposed based on an output-redefinition making the zero-dynamics with respect to the new output stable. Additionally, robust adaptive laws are utilized for the estimation of unknown parameters and actuator failure compensation of the AHSV model. Furthermore, the stability of the closed-loop system is analyzed based on the Lyapunov stability theory. At last, the numerical simulation results are provided to demonstrate the effective tracking performance of the proposed FTC scheme. Highlights: The proposed FTC scheme is based on multi-input multi-output (MIMO) hypersonic vehicle longitudinal model and without neglecting elevator-to-drag decoupling for the original model. By employing least square parameter estimation method in conjunction with stable system center (SSC) method, ideal internal dynamics (IID) can be calculated online. The designed tracking controller based on output-redefinition is applicable for other non-minimum phase systems subject to parametric uncertainties and actuator faults.