针对一类执行器发生故障的非线性系统,提出了基于T-S模糊模型和模型参考自适应控制的容错控制设计方案。该方案特点是:在利用Takagi-Sugeno(T-S)模糊模型对非线性系统进行建模时,假设局部线性模型的参数未知,利用自适应控制算法,在线调整控制器参数,实现系统对参考模型的状态跟踪。在系统发生故障时,系统能够重构控制律以抵消故障对系统的影响,维持系统的稳定性以及期望的跟踪目标。利用李亚普诺夫理论分析了系统的稳定性,给出了能够实现状态跟踪的匹配条件以及控制器参数更新律。利用某飞机模型进行了仿真,证明本文方法的有效性。
A tolerant control design technique based on the model reference adaptive control and Takagi-Sugeno(T-S) model is investigated to guard against the actuator failures. Unlike the usual T-S model method, the matrix parameters of the local linear model are unknown. Therefore the controller parameters are adjusted on-line in order to make the system tracking the reference system. While faults occurred, the tolerant control laws are reconfigured to cancel the effects of the failed actuators, the stability and desired tracking property are guaranteed. The matching conditions and the controller adjusting laws are given based on Lyapunov theory. A simulation example shows that the reconfigurable method receives a good effect.