Fault-tolerant Control and Disturbance Attenuation of a Class of Nonlinear Systems with Actuator and Component Failures
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摘要: 本文研究了一类受扰非线性系统存在执行器及元件故障时的镇定控制问题。新的容错控制算法不需要对执行器故障范围界值进行分析估算,因此与现存的方法相比,设计的控制策略结构更加简单,也不需要大量的在线计算。结果表明,应用所设计的控制方法,不仅保证执行器及元件故障下系统的稳定性,也能够有效抑制那些与状态相关不断增长的干扰对系统的影响。通过Lyapunov稳定性理论分析和仿真,均证明了所设计控制算法的有效性,能保证系统同时存在外界干扰、参数不确定性以及执行器/元件故障时的稳定性.Abstract: This paper investigates the stabilization problem of a class of nonlinear dynamic systems with actuator and component failures as well as external disturbances. New fault-tolerant control algorithms are derived without the need for analytically estimating bound on actuator failure variables, and thus the resultant control scheme has simpler structure and demands less online computations as compared with most existing methods. It is shown that with the proposed control, both actuator and subsystem/component failures can be accommodated, and the state dependent growth disturbances can be effectively attenuated. The algorithm is validated via a formative mathematical analysis based on a Lyapunov approach and numerical simulations in the presence of external disturbances, parametric uncertainties, as well as severe actuator/subsystem failures.
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