基于观测器的传感器故障重构方法及其应用

Observer-based Sensor Fault Reconstruction Method and Its Application

针对一类不确定非线性系统,并考虑含有未知输入扰动,提出了一种传感器故障重构方案。首先引入一个新的状态变量将传感器故障等效为执行器故障;然后利用滑模变结构中的等值控制方法设计了状态观测器,消除了未知输入扰动对系统的影响;再采用自适应方法实现了对故障的重构。最后将本文提出的方法在火炮伺服系统中应用,表明了该方法的有效。

A sensor faults reconstruction proposal for a class of uncertain nonlinear system with un- known input disturbances was presented. The sensor fault was equated to the actuator one by a new introduced state variable; a state observer based on sliding mode variable structure theory was designed with specific equivalent control methodology, in order to eliminate the effects of unknown disturbances on the system; the faults were reconstructed by means of adaptive method. Results of numerical simulations on the artillery position servo system verify the validity of the proposed approaches.