Adaptive quantized control for hypersonic flight vehicles subject to actuator faults and backlash nonlinearity

In this paper, an adaptive quantized control scheme is proposed for a class of hypersonic flight vehicles with actuator faults and elevator backlash. An improved hysteretic quantizer is employed to reduce the communication burden and chattering phenomenon, whose parameters are allowed to be freely changed according to tracking performance and communication capability. By designing adaptive laws to estimate the bounds of time-varying uncertainties, the impacts of the actuator faults, the input quantization and the backlash nonlinearity are successfully compensated for and boundedness of all the closed-loop signals is ensured. Meanwhile, by introducing a double transformation technique, both the altitude and the velocity of the vehicle can track desired trajectories with prescribed transient and steady-state performance, which implies that the proposed adaptive quantized control scheme provides satisfactory tracking performance in addition to higher reliability. The effectiveness of the proposed scheme is demonstrated via simulation results.