期刊
IEEE ACCESS
卷 9, 期 -, 页码 92614-92628出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3092164
关键词
Uncertainty; Atmospheric modeling; Aerospace control; Switches; Aircraft; Adaptation models; Fault tolerant systems; Adaptive observer; sliding mode disturbance observer; fault accommodation; incremental terminal sliding mode control; gain-adaptation law
The paper introduces a switched adaptive SMDO method to observe system uncertainties and accommodate faults effectively, which is essential for flight control of aircraft. The SMDO consists of two adaptive modes, one for slow-changing uncertainties and one for fast observing and accommodating sudden faults, with a switching logic to ensure optimal performance.
Typical fault scenarios such as actuator stuck, wingtip damage, and sudden center of gravity change usually bring great challenge to fault-tolerant flight control laws. In this paper, adaptive sliding mode disturbance observer (SMDO) is studied under the background of designing a fault-tolerant flight controller. This paper proposes a switched adaptive SMDO for observation of system uncertainties considering fault accommodation. It consists of two adaptive SMDOs: baseline gain-adaptation SMDO and fault-oriented gain-adaptation SMDO. The former is designed for observing slow-changing uncertainties, and can guarantee that the observer gains are small when disturbances are small; the latter aims at achieving fast observing and accommodating of sudden and large faults. Thereafter, a switching logic is developed for the switch between these two adaptive SMDO modes to ensure that the fast gain-adaptation SMDO only works in the case that the uncertainties are large and fast-changing. Finally, the switched adaptive SMDO is integrated with an incremental terminal sliding mode controller, and are validated using simulation experiments based on the nonlinear F-16 model.
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