基于系统参数估计时间序列的小波分析故障诊断方法

提出了一种失效性故障诊断的新方法.这种方法将基于解析模型的故障诊断技术和基于信号分析的故障诊断技术结合起来,对系统参数的递推最小二乘估计时间序列进行小波分析,得到故障特征值,兼有两种故障诊断技术的优点.本文还讨论了对于模型参数估计时间序列小波分析的基函数及尺度选取方法问题,仿真结果表明该方法的有效性和准确性非常明显,具有一定的实用价值.

A Fault Diagnosis Method of Wavelet Analysis Based on Time Sequences of System Parameter Estimate

This paper presents a new method of disabled fault diagnosis. The method integrates both the fault diagnosis technology based on analytical model and the technology based on the signal processing, and gets the fault feature by wavelet analysis of the RLS estimate time sequences of system parameter. It possesses the advantage of these two kinds of fault diagnosis technology. The way to choose wavelet basic function and scale of the issue mentioned in this paper is also discussed. The simulation results show that our method is effective.