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Control Performance Simulation for Hypersonic Vehicle Model with Actuator Faults

This paper analyzes the time-domain and frequency-domain characteristics of hypersonic vehicle faulty model based on the longitudinal model. Three types of faults that occur in the elevator deflection of hypersonic vehicle are given: loss of effectiveness fault, random drift fault and lock-in-place fault. The simulations are performed in the time-domain and frequency domain respectively. In the time-domain, faults are applied on the nominal fault-free model at a certain time in the case of stable flight of the nominal system without any fault-tolerant strategy. By comparing the states of the nominal system in the stable flight with the states after the fault occurs, the influence of various faults on the stability of the hypersonic vehicle flight system is analyzed. In the frequency-domain, by comparing the Bode plot and the Nyquist curve of the nominal model and the faulty model of hypersonic vehicle, the influence of the faults on the model itself is analyzed.