基于包络谱带通峭度的改进谱峭度方法及在轴承诊断中的应用

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (23) : 171-179.

论文

张龙1,2,3，毛志德2，杨世锡1，李兴林3

作者信息 +

An improved Kurtogram based on band-pass envelope spectral Kurtosis with its application in bearing fault diagnosis

ZHANG Long1,2,3， MAO Zhide2， YANG Shixi1， LI Xinglin3

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文章历史 +

摘要

快速谱峭度方法（Kurtogram）是解决用于滚动轴承故障诊断的共振解调方法中带通滤波器中心频率和带宽参数确定问题的有效方法。 Kurtogram以滤波后时域信号的峭度值作为滤波效果度量指标，然而该指标易受非高斯噪声和偶然性非周期冲击影响，可能导致滤波频带选择错误。考虑到偶然性冲击和非高斯噪声的包络谱与周期性冲击包络谱之间的特性差别，同时为了排除齿轮局部故障和转子碰摩等故障造成的冲击影响，本文提出按一定规则截取滤波后信号包络谱的中间段，并以该段数据的峭度值衡量周期性冲击响应的强弱，称为包络谱带通峭度。以包络谱带通峭度代替Kurtogram中滤波后时域信号的峭度值，得到一种改进的快速谱峭度方法。以仿真信号和实验室实测信号分析验证了本文方法的有效性和优越性。

Abstract

Kurtogram is an effective approach to determine the band-pass filter’s central frequency and band width parameters in the resonant demodulation method applied in rolling bearing fault diagnosis.In Kurtogram,a time domain signal’s Kurtosis value was taken as the filtering effect measure index,but this index was easy to be affected by non-Gaussian noise and occasional non-periodic impact,and cause wrong selection of filtering frequency band.Here,considering feature difference between the envelope spectrum of occasional impact and non-Gaussian noise and that of periodic impact,removing the influence of impacts caused by gear local fault and rotor rubbing,the middle segment of the filtered signal’s envelope spectrum was intercepted according to a certain rule,the Kurtosis of this segment envelope spectrum was proposed to measure the strength of periodic impact and called the band-pass envelope spectral kurtosis.The band-pass envelope spectral Kurtosis was employed to replace the filtered time domain signal’s Kurtosis and obtain an improved Kurtogram method.The effectiveness and advantages of the proposed method were verified with analyses of simulation signals and actual measured signals.

导出引用

张龙1,2,3，毛志德2，杨世锡1，李兴林3. 基于包络谱带通峭度的改进谱峭度方法及在轴承诊断中的应用[J]. 振动与冲击, 2018, 37(23): 171-179

ZHANG Long1,2,3， MAO Zhide2， YANG Shixi1， LI Xinglin3. An improved Kurtogram based on band-pass envelope spectral Kurtosis with its application in bearing fault diagnosis[J]. Journal of Vibration and Shock, 2018, 37(23): 171-179

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