Adaptive Fuzzy Sliding Mode Control Design for a Low-Lift Reentry Vehicle

AbstractIn this paper, a multioutput trajectory control of a reentry vehicle is presented. Adaptive fuzzy sliding mode control with an adjustable structure of the membership function is employed. The main goal of the adjustable structure is that the span of the membership function covers all the variations of the fuzzy inputs. The fuzzy inputs include the altitude, velocity, and flight path angle of the vehicle. The sliding surface is designed in two steps. At the first step, the error of the flight path angle is solely employed. Then, to improve the performance, the altitude and velocity of the reentry are added to sliding surface. The stability of the closed loop system is proven on the basis of the Lyapunov approach. To consider performance of the closed loop system, some simulations are done. The results show outperformance of the proposed method.

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