航空发动机导叶控制机构液压作动筒在高速、高温、变载荷等条件下发生故障时, 会导致液压作动筒工作状态受限, 引起系统实际的物理参数发生突变, 进一步加剧了系统的参数不确定性以及未建模干扰, 从而恶化整个系统的位置跟踪精度, 严重时使航空发动机失稳。为提高航空发动机导叶控制机构液压作动筒在故障发生时的控制性能与容错能力, 提出了一种积分鲁棒自适应主动容错控制策略。为减小参数不确定性, 提出了一种基于参数估计误差与跟踪误差的复合参数自适应律, 不仅可以实现参数的快速收敛, 还提高了系统的主动容错能力。为消除参数不确定性与抵抗外干扰, 利用积分鲁棒反馈思想发展了一种积分鲁棒自适应主动容错控制, 进一步增强了液压作动筒的容错能力与位置跟踪能力。基于Lyapunov理论, 证明了该主动容错控制策略在外干扰下能实现系统位置跟踪误差的渐近收敛。仿真结果表明, 提出的主动容错控制策略和现有的容错方法相比具有良好的参数自适应能力和抗干扰能力, 估计的参数在7 s内可快速收敛。
When hydraulic actuating cylinders of aeroengine guide vane control mechanisms fail under the conditions of high speed, high temperature and variable loads, the working states of hydraulic actuating cylinders will be limited and the actual physical parameters of the system will change abruptly, which further aggravates parametric uncertainties and unmodeled disturbances and deteriorates position tracking accuracy and even makes the system unstable. To improve the control performance and fault-tolerance ability of hydraulic actuating cylinders, this paper proposes an integral robust adaptive active fault-tolerant control strategy for motion tracking control of aeroengine hydraulic actuating cylinders under fault conditions. To reduce parametric uncertainties, a composite parameter adaptive law is developed based on both parameter estimation errors and the tracking error, which can not only achieve fast convergence rates of parameters, but also improve the active fault tolerance of the system. To eliminate the remaining parametric uncertainties and external disturbances, an integral robust adaptive active fault-tolerant control method is presented, which further enhances the fault-tolerant ability and tracking accuracy of the hydraulic actuating cylinder. On basis of the Lyapunov theory, it is demonstrated that the active fault-tolerant control strategy can realize asymptotic convergence of the tracking error under external disturbances. The simulation results show that the proposed active fault-tolerant control strategy has better parameter adaptive ability and anti-disturbance ability than existing fault-tolerant control methods, and the estimated parameters can converge quickly within 7 s.
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