Fast Robust Asymptotic Fault Accommodation for Reentry Near Space Vehicles

摘要

In this paper, a fault accommodation scheme is proposed with multiple type faults for near space vehicle (NSV) attitude dynamics. Firstly, NSV reentry mode and system faults are described, and the actuator loss-of-effectiveness (LOE) and stuck failure models are developed whose behavior is described by a second-order dynamics. Next, two new local algorithms for fault diagnosis and identification (FDI) are proposed for NSV system faults and actuator failures. The system FDI is driven by the fault estimation error instead of state tracking or prediction errors. The structure of FDI for actuator LOE is similar to the model reference adaptive control for input-output actuator model, which is a major adaptive control design method. It can be achieved FDI for different types faults by the fault simulator. A backstepping fault tolerant control (FTC) based on local FDI is designed for reentry NSV. Finally, simulation results are given to demonstrate the effectiveness and potential of the proposed FTC scheme.