emd包络谱故障分析

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1、基于EMD的包络谱进行故障诊断故障频率介绍:AiyBXft至二DefectfreauencJey：ofrunninaspeedinXn、《佶赛InnerRinaMiOuterRina仝CiMieTrainRollinaElement5.4152<5.33299)3.58480.398284.7135轴承故障的频率f=a*fr（a是上表系数，fr是电机转数）正常信号对正常信号分别观察原始信号和频谱，原始信号的包络，EMD分解，EMD分解后的IMF分频谱和包络。原始信号及频谱0020003000400050006000原始信号频谱50006000从时域图中

2、可以看到较为明显的周期性冲击，但是故障特征不明显。在频谱当中,亦存在较为明显的边频带以及很多共振频率，这些冲击大都是电机转数的倍频。原始信号的包络0.040.030.020.01°r100020003000400050006000原始信号部分频段包络谱X:30.03Y:0.031130.030.020.01°0X:60.06Y:0.01448100200300400500600求信号的包络谱，明显看出转速及其二倍频。EMD分解202IMF1时域波形图0.10.20.30.40.50.60.70.80.9IMF2时域波形图0.20.30.40.50.60

3、.70.80.9IMF3时域波形图-°%0.20.30.40.50.60.70.80.9IMF4吋域波形图202202••••oo0-0000.10.20.30.40.50.60.70.80.9IMF5时域波形图rIIII

4、III0.10-0.100.10.20.30.40.50.60.70.80.9IMF6时域波形图°-%-0.0500.10.20.30.40.50.60.70.80.9IMF分量的频谱0.0500IMF1频谱10002000300040005000IMF2频谱60000.020IIIII10002000300040005000IMF

5、3频谱60000.010.0050010002000300040005000IMF4频谱6000210150150ooooOO66a.o0.0oo6000010002000300040005000IMF5频谱010002000300040005000IMF6频谱60000100020003000400050006000IMF分量的包络IMF1包络谱0.05001002003004005006007008009001000IMF2包络谱01002003004005006007008009001000IMF3包络谱010020030040050060070

6、08009001000IMF4包络谱0300400500600700IMF5包络谱80090010001002000100200300400500600700IMF6包络谱80090010005001002003004005006007008009001000从上图可以看出，也有电机转速的及苴倍频处的冲击。内圈故障（f二5.4152*1797/60二162・1852Hz）对故障分别观察原始信号和频谱，原始信号的包络，EMD分解，EMD分解后的IMF分频谱和包络。原始僭号及频谱o°20003000400050006000从时域图屮可以看到较为明显的周期性

7、冲击，但是故障特征不明显。在频谱当中,亦存在较为明显的边频带以及很多共振频率，因此仅通过时域波形和频谱无法得到故障信息。原始信号的包络求取故障信号的包络谱，可以显示161.9Hz（接近162HZ）的故障频率,但是也被埋藏在其他的频率中，不能确定就是内圈故障。EMD分解O062-iIMF1时域波形图0.30.40.50.6IMF2吋域波形图0.70.80.30.40.50.6IMF3吋域波形图0.70.80.90.9O5•O-枷（Hv*伸脚4H册Hh讪拠4＞伽阳

8、）的吩》哪枷测）*帕啊卅咖刪*机1你叫附榊咖蝌丽艸恻网沖-0.30.40.50.6IMF1时

9、域波形图0.70.80.9o-O5AU50.30.40.50.6IMF2时域波形图0.70.80.9o-O1O10.30.40.50.6IMF3吋域波形图0.70.80.9<50.30.40.50.60.70.80.9IMF分量的频谱III.>L^Ld.AtiI—aAuajLuu…II100005000IMF1频谱200030004000IMF2频谱60000.05001000200030004000IMF3频谱500060001000200030004000IMF1频谱500060000.0501J4JIIIIIh・JIIII100005000200

10、030004000IMF2频谱6000200030004000IMF3频谱6000lbu_ii