Adaptive fault-tolerant control of reentry vehicle considering actuator and sensor faults based on trajectory optimization

Abstract

Based on the trajectory optimization, this article studies the adaptive fault-tolerant compensation control method for a reentry vehicle with external disturbances and parameter uncertainties. The sensor and actuator faults are both considered including loss of effectiveness, stuck and outage of actuator, and loss of effectiveness of sensor. First, we need to set up the reentry model for the reentry vehicle, use computational fluid dynamics to calculate the heating rate on the surface of the vehicle, divide the vehicle into several isothermal regions appropriately according to the heating rate, and establish the corresponding database for the aerodynamic characteristics. Next, based on the database accomplished, more accurate control variables and flight path can be achieved using the conjugate gradient method, and the aerodynamic heating rate on the surface of the reentry vehicle will be improved considerably. Then, based on the trajectory optimization, an adaptive fault-tolerant compensation control method is introduced to deal with the external disturbances and parameter uncertainties of the reentry vehicle system. And the Lyapunov functional is adopted to guarantee the stability of the system. At last, the effectiveness of such adaptive fault-tolerant control method has been identified by numerous simulation results.