Adaptive Fault-tolerant Control for Flight Systems with Severe Actuator Failures

摘要

This paper proposes an adaptive fault tolerant control scheme for the flight system with severe actuator failures. This paper focuses on guaranteeing the system performance without any significant degradation when most actuators lose effectiveness or become damaged. An adaptive controller is designed to track the reference model with desired performance. Then, the adaptive control signal is allocated to the operating actuators based on the fault information. In addition to severe actuator failures, this paper considers more complex and realistic models with input saturation and model mismatch. An improved weighting algorithm and an anti-saturation controller are proposed to compensate for the saturation error. Due to model mismatch, the traditional reference model may not be appropriate. Thus, this paper designs an adaptive reference model which can also provide satisfactory system performance. Finally, simulations of a satellite launch vehicle model are conducted to demonstrate the effectiveness of the proposed scheme. Compared to the traditional fault tolerant control with control allocation method, the proposed scheme gives better performance.