Abstract
In this paper, a fault tolerant fuzzy tracking controller is designed for Mars entry vehicles during the entry phase in the presence of actuator failures. The original nonlinear attitude dynamics are divided into two subsystems based on the concept of time-scale decomposition. Dynamic inversion method is employed for the slow kinematic subsystem to give the angular velocity command by taking the attitude command as its input. The Takagi-Sugeno (T-S) fuzzy model based control method is applied for the fast kinetic subsystem by taking angular velocity command as its input to derive the desired control torque in the presence of actuator failures. Finally, the simulation results are given to demonstrate the effectiveness of the developed method for the Mars entry fault tolerant attitude control problem.
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