impulse 发表于 2010-9-22 00:31

再议包络谱分析

LabVIEW关于包络分析的说明，The envelope detection technique involves the following three steps: shifting the narrow band range in the high frequency band to the base band,
filtering the frequency-shifted signal using a lowpass filter, and calculating the envelope signal of the lowpass-filtered signal。现在不敢确定用hilbert法做包络谱是否与它一致，后两步肯定没问题，就是第一步好像有差异，虽然hilbert法效果也可以。

impulse 发表于 2010-9-22 19:46

本帖最后由 impulse 于 2010-9-22 19:55 编辑

发一下hilbert法求包络谱与labVIEW包络谱比较图。数据取自LabVIEW Sound and Vibration Measurement Suite中的包络谱分析，数据中包含一个外圈故障频率（Outer race frequency）—约61.6Hz，工作转速频率在20.6Hz左右。
http://forum.vibunion.com/data/attachment/album/201009/22/1954528csv5hng44xbb824.jpg



migicmika 发表于 2012-11-24 19:47

impulse 发表于 2010-9-22 19:46 static/image/common/back.gif
发一下hilbert法求包络谱与labVIEW包络谱比较图。数据取自LabVIEW Sound and Vibration Measurement Suite中 ...

用的哪个函数vi， 我想试一下，也想自己写一个包络谱，

impulse 发表于 2012-11-25 21:22

migicmika 发表于 2012-11-24 19:47 static/image/common/back.gif
用的哪个函数vi， 我想试一下，也想自己写一个包络谱，

声学振动工具包里的OAT Envelope Detection VI
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