改进的迭代希尔伯特变换及其在滚动轴承故障诊断中的应用

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (11) : 83-88.

论文

改进的迭代希尔伯特变换及其在滚动轴承故障诊断中的应用

秦毅1，任兵1，李宁2，王腾1

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An Improved Iterative Hilbert Transform and Its Application to Rolling Bearing Fault Diagnosis

Yi Qin1,Bing Ren1,Ning Li2,Teng Wang1

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文章历史 +

摘要

针对现有迭代希尔伯特变换（IHT）存在端点效应和滤波器设计主要依靠先验知识，提出了一种改进的IHT方法用于机械故障诊断。分析了IHT方法中端点效应的原因，提出了基于对称延拓信号的方法来消除端点效应的影响。同时，提出了一种自适应的零相位滤波器取代原方法中的固定滤波器。将改进后的IHT方法和原方法进行仿真对比分析，证实了该方法的解调精度更高，并有效地抑制了端点效应。最后，利用改进的IHT方法进行轴承故障诊断试验，结果表明该方法具有更好解调的效果，能够更准确地提取外圈故障特征。

Abstract

As the end effect exists in the iterative Hilbert transform (IHT) and the design of filter depends on the prior knowledge, an improved approach for mechanical fault diagnosis is proposed. Analyzing the causes of the End Effect in the method of IHT, a method based on the symmetric extension of signal to eliminate the End Effect is proposed. Meanwhile, an adaptive zero-phase filter design method is proposed to replace the fixed filter in the original method. Simulation testing shows that the new method in this paper has a higher accuracy in the demodulation and efficiently inhibits the end effect compared with the original method. At last, the method is used to analyze the fault of the rolling bearing and the results show that the method in this paper can has an improved effect and can extract the fault feature more accurately.

导出引用

秦毅;任兵;李宁;王腾. 改进的迭代希尔伯特变换及其在滚动轴承故障诊断中的应用[J]. 振动与冲击, 2013, 32(11): 83-88

Yi Qin;Bing Ren;Ning Li;Teng Wang. An Improved Iterative Hilbert Transform and Its Application to Rolling Bearing Fault Diagnosis[J]. Journal of Vibration and Shock, 2013, 32(11): 83-88