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基于故障特征频率的阶比双谱方法及其在滚动轴承故障诊断中的应用

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Keywords: 线调频小波,阶比双谱,故障特征频率,滚动轴承,故障诊断

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Abstract:

当滚动轴承出现故障时,其产生的振动信号往往表现出较强的非线性、非高斯和非平稳特征。为了实现非平稳转速下滚动轴承的故障诊断,提出了一种基于故障特征频率的阶比双谱分析方法(orderbispectrumanalysisbasedonfaultcharacteristicfrequency,OBBF)。该方法先对滚动轴承故障振动信号进行包络解调,利用线调频小波路径追踪算法估计出轴承振动包络信号中的故障特征频率,再基于故障特征频率对包络信号进行等角度重采样,将非平稳的时域信号转化为平稳的角域信号;最后对重采样后的信号进行双谱分析,并取其对角切片,得出故障结论。诊断实例表明,该方法能有效地提取滚动轴承故障振动信号的特征,对滚动轴承故障进行正确的诊断。

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