Failure to counteract in-flight actuator stuck failures within a limited amount of time can result in catastrophic consequences. Aircraft safety is also undermined when fault-tolerant control (FTC) systems are designed based on inaccurate diagnostic results. This paper presents an FTC scheme for transport aircraft subject to actuator stuck failures, which is integrated with fuzzy logic system (FLS), real finite-time sliding mode control (RFTSMC), and least squares control allocation (LSCA) techniques. First, the term, including the stuck information, is obtained by resorting to an FLS. The norm of the weight matrix is adopted in the FLS estimation, such that the amount of the adaptive parameters is independent of the number of FLS rules. Following this, a virtual fuzzy logic aided FTC strategy is developed using RFTSMC, by which the actuator stuck failure is counteracted within finite time. Furthermore, an LSCA unit is capable of distributing the commands to the fault-free actuators, with explicit consideration of incorrectly identified values of actuator effectiveness indicators. Finally, simulation studies of a nonlinear Boeing 747 longitudinal model are performed to validate the effectiveness of the proposed scheme.

中文翻译：

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模糊逻辑辅助容错控制应用于执行器卡住故障的运输机


如果未能在有限的时间内消除飞行中执行器卡住的故障，可能会导致灾难性的后果。当容错控制（FTC）系统是基于不准确的诊断结果设计时，飞机的安全也会受到损害。本文提出了一种针对执行器卡住故障的运输机的 FTC 方案，该方案集成了模糊逻辑系统（FLS）、实时有限时间滑模控制（RFTSMC）和最小二乘控制分配（LSCA）技术。首先，该术语（包括卡住信息）是通过 FLS 获得的。 FLS估计中采用权重矩阵的范数，使得自适应参数的数量与FLS规则的数量无关。随后，使用 RFTSMC 开发了虚拟模糊逻辑辅助 FTC 策略，通过该策略在有限时间内抵消执行器卡住故障。此外，LSCA 单元能够将命令分配给无故障的执行器，并明确考虑执行器有效性指标的错误识别值。最后，对非线性波音747纵向模型进行仿真研究，验证了所提方案的有效性。