基于逆系统方法的非线性系统故障调节

Nonlinear system fault accommodation based on inverse system method

针对一类多输入多输出非线性可逆系统,提出一种基于逆系统原理的故障调节方法.该方法通过设计被控对象的自适应观测器来估计执行器故障,并根据故障估计值,基于逆系统方法产生附加控制律对逆系统进行调节补偿,使得被控对象和经调节后逆系统的串联仍能保持为无故障时的伪线性系统模型,从而在无需改变系统正常控制器参数的情形下,方便地实现对执行器故障的良好性能容错目标.

Aimed at a class of multi-input multi-output （MIMO） nonlinear invertible systems, a method of nonlinear system fault accommodation was proposed based on inverse system. By using this method, the actuator fault was estimated by means of designing an adaptive observer of controlled plant and, according to the fault estimate, the inverse system was accommodated and compensated with the additional controlling law obtained by using inverse system method, so that the serial system of controlled plant and the accommodated inverse system would still remain a pseudo-linear system on condition that there was no fault. Therefore, the objective of fault-tolerant control was conveniently realized for the actuator fault without alteration of normal control parameters of system.