access icon free Adaptive non-singular fault-tolerant control for hypersonic vehicle with unexpected centroid shift

© The Institution of Engineering and Technology
Received 04/02/2018, Accepted 03/06/2019, Revised 19/06/2018, Published 07/06/2019

A study on hypersonic vehicle (HSV) with centroid shift and actuator fault is made to investigate the adaptive fault-tolerant control for stability recovery of HSV operating in off-nominal conditions. Based on the modelling and analyzing the influence of centroid shift and actuator fault on HSV, the centroid shift can cause system uncertainty, variation of inertial matrix, eccentric moment and strong coupling between the longitudinal and lateral motions, resulting in the high demand for controller. According to the difference of response time, the attitude system of HSV is divided into slow and fast loop. For handling the effect of centroid shift, actuator fault and external disturbance, an improved sliding mode controller combined with adaptive estimator is designed for the slow-loop. Nonlinear general predictive controller (NGPC) assisted by adaptive radial basis function neural network (RBFNN) is developed for fast-loop. In addition, the nonsingular improvements to fast-loop controller are also made to cope with such the problem caused by the estimation of inertial matrix. The stability and tracking ability of the system are analyzed by the Lyapunov theorem of stability. At last, the simulation results show that the fault-tolerant control algorithm provided in this paper is very effective.

Inspec keywords: vehicle dynamics; motion control; radial basis function networks; adaptive control; mechanical stability; variable structure systems; predictive control; aircraft control; matrix algebra; control system synthesis; neurocontrollers; fault tolerant control; aerodynamics

Other keywords: longitudinal motion; adaptive radial basis function neural network; system input matrix; HSV; aerodynamic parameters; nonlinear general predictive control; lateral motion; fast-loop controller; fault-tolerant control algorithm; aerodynamic modelling; actuator fault; hypersonic vehicle; adaptive nonsingular fault-tolerant control; eccentric moment; off-nominal flight conditions; improved sliding mode control; adaptive estimation method; adaptive fault-tolerant control method; unexpected centroid shift; nonsingular fault-tolerant controller; control derivatives; control slow-loop

Subjects: Optimal control; Multivariable control systems; Spatial variables control; Aerospace control; Fluid mechanics and aerodynamics (mechanical engineering); Neurocontrol; Control system analysis and synthesis methods; Self-adjusting control systems; Control technology and theory (production); Stability in control theory; Algebra; Algebra; Buckling and instability (mechanical engineering); Vehicle mechanics

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