基于降维观测器的非最小相位系统的快速故障估计

Fast Fault Estimation of Non-Minimum Phase Systems Based on Reduced-Order Observer

针对传统的基于自适应观测器的故障诊断方法不适用于非最小相位系统的问题,本文基于降维观测器提出了一种新的自适应故障估计方法.首先引入特殊坐标基(special coordinate basis,SCB)变换,可以方便地求出误差系统的不变零点.其次对于变换之后的系统,基于降维观测器提出了一种新的快速故障估计方法,目的在于提高故障估计的性能,即故障估计的快速性和准确性.最后仿真验证了此方法的有效性.

Conventional fault diagnosis technique based on adaptive observer can not be used for non-minimum phase systems. Using reduced-order observer, this paper proposes a new adaptive fault estimation method. Firstly, special co- ordinate basis （SCB） transformation is introduced to calculate invariant zeros of the error systems conveniently. Then, a novel fast fault estimation method based on reduced-order observer is proposed for the changed system with the purpose of improving the fault estimation performance, i.e., rapidity and accuracy of fault estimation. Finally, simulation results are presented to illustrate the efficiency of the proposed method.