EMD包絡譜故障分析

1、基于EMD的包絡譜進行故障診斷信號時域波形2LL障頻率介紹: ;.I ;】.-1rLJ0.20.15正常信0.1對正常分解后的5 I0.3旳胡.4第 s 0.6O.U.r.'O.I< 5.3329>譜0.7【障的頻率f=a*fr（a是上表系數(shù)，fr是電機轉數(shù)）蘭戸亍號分別觀察原始信號和頻譜MF分頻譜和包絡。0.80.9原始信號的包絡，EMD分解“.一晶- ifiJi 、丨 i a j 土 - i.I，EMD原始信號及頻譜00020003000400050006000原始信號時域波形0.4-0.400.060.040.020.10.20.30.40.50.60.70.8-0.

2、200.2原始信號頻譜0.9X: 164.8Y: 0.01828X: 358.9Y: 0.01467X: 1036Y: 0.0564X: 2102Y: 0.02123100020003000400050006000從時域圖中可以看到較為明顯的周期性沖擊，但是故障特征不明顯。在頻譜當中, 亦存在較為明顯的邊頻帶以及很多共振頻率，這些沖擊大都是電機轉數(shù)的倍頻。原始信號的包絡原始信號包絡譜 原始信號部分頻段包絡譜X： 30WY: 0.031130.030.02X: 60.06Y: 0.014480.01100200300400500600求信號的包絡譜，明顯看出轉速及其二倍頻。EMD分解IMF1時域

3、波形圖2O-2200/- a a a a - - . 1 L 卜Y吟fl00.10.20.30.40.50.60.70.8IMF2時域波形圖rrrri00.10.20.30.40.50.60.70.8IMF3時域波形圖0.90.92O-2a a-0.90.10.220a0.10 -0.100.30.40.50.60.70.8IMF5時域波形圖rrrri0.90.10.20.30.40.50.60.70.8IMF6時域波形圖0.90.10.20.30.40.50.60.70.8IMF4時域波形圖00.10.20.30.40.50.60.70.80.9IMF分量的頻譜0.050l. 1.丄.rjr

4、r0 1000IMF1頻譜200030004000IMF2頻譜500060000.020.0100 1000200030004000IMF3頻譜500060000.010.0051000200030004000IMF4頻譜500060000.020.011000200030004000IMF5頻譜500060000.010.005001000200030004000IMF6頻譜500060000.010.00500100020003000400050006000IMF分量的包絡0.0500100 200IMF1包絡譜3004005006007008009001000IMF2包絡譜210OO00

5、01002003004005006007008009001000IMF3包絡譜15 0OO%tLI-lL-1J-£rrrrr01002003004005006007008009001000IMF4包絡譜210OO000 100 2003004005006007008009001000IMF5包絡譜0.010.005 0 0100-3x 1052003004005006007008009001000IMF6包絡譜01002003004005006007008009001000從上圖可以看出，也有電機轉速的及其倍頻處的沖擊原始信號時域波形2 1ILLLL-2 fI-IIt00.10.20

6、.30.40.50.60.70.80.9從時域圖中可以看到較為明顯的周期性沖擊，但是故障特征不明顯。在頻譜當中， 亦存在較為明顯的邊頻帶以及很多共振頻率，因此僅通過時域波形和頻譜無法得到故障信息。原始信號部分頻段包絡譜0.20.150.10.050X: 161.9Y: 0.1879X: 101.8Y: 0.08266X: 60.06Y: 0.08009忙*Ml-0100200300400500600求取故障信號的包絡譜，可以顯示161.9Hz （接近162HZ）的故障頻率,但是也被埋藏在其他的頻率中，不能確定就是內圈故障。EMD分解1O-150 5a a-IMF1時域波形圖2O-20.30.4

7、0.50.6IMF2時域波形圖恤吟番*價Ji” ？皿止11 ；亀”民 佯|1F0.30.40.50.6IMF3時域波形圖0.70.80.70.8r*r0.30.40.50.6IMF1時域波形圖0.70.80.90.90.9Ft o50 5a a-0.30.40.50.6IMF2時域波形圖0.70.80.9FL o1 o 1a a-0.30.40.50.6IMF3時域波形圖0.70.80.9505o00 0-ee啊f訶t側帕: .-.'.-I ；! |l|i(l L. i . P.j'di0.30.40.50.60.70.80.9IMF分量的頻譜oo210LLILLTrLLmIj

8、 " -i rJ，-LjrIMF1頻譜200030004000IMF2頻譜50006000200030004000IMF3頻譜50006000oo420 ooTdi200030004000IMF1頻譜500060000.05001000200030004000IMF2頻譜500060000.010.005 0 01000200030004000IMF3頻譜500060000.010.00500 100020003000400050006000IMF分量的包絡0.10.050 100X: 161.92°:(b.Q694300400500600700IMF3包絡譜8009001

9、000OO420OOX: 161.9IrLI.LLi:EX: 161.9-ITupLIMF1包絡譜010020(0.18393004005006007008009001000IMF2包絡譜2104005006007008009001000IMF1包絡譜OO210 5OO鴉需8300400500600IMF2包絡譜700800900100000 100 2003004005006007008009001000IMF3包絡譜0.010.005300400500600700800900100000 100 200從上圖可以看出，從前四個IMF分量可以看出故障頻率，但是也有電機轉速的及其 倍頻處的沖擊

10、。外圈故障(f= 3.5848 *1796/60=107.305Hz)外圈故障和內圈故障的分析類似。0.4原始信號頻譜0.30.20.1原始信號的包絡原始信號包絡譜0.80.60.40.200 1000 20003000400050006000原始信號部分頻段包絡譜0.80.6X: 107.7Y: 0.6778X: 215.3Y: 0.39330.4 >-X: 30.03Y: 0.1468 0.2X: 77.64X: 323Y: 0.1971100200300400500600EMD分解IMF1時域波形圖50-500.10.20.30.40.50.60.70.80.9IMF2時域波形圖2

11、0-200.10.20.30.40.50.60.70.80.9IMF3時域波形圖10-100.10.20.30.40.50.60.70.80.9IMF4時域波形圖20.20 0-00.10.20.30.40.50.60.70.80.9IMF5時域波形圖2O-2a a-00.10.20.30.40.50.60.70.80.9IMF6時域波形圖卜.寸E 血*：*切|7'打1*昭彳討I出"JAWJ0.10-0.100.10.20.30.40.50.60.70.80.9IMF分量的頻譜FL O42000ILLLrrrrIMF1頻譜200030004000IMF2頻譜50006000F

12、kt O21000OO420OOOO420OO200030004000IMF3頻譜200030004000IMF4頻譜200030004000IMF5頻譜5000600050006000500060000.010.005 0 010005000200030004000IMF6頻譜60000.010.005 0 0LLI ,二grrrr100050002000300040006000IMF分量的包絡X: 107.7Y: 0.6562IMF1包絡譜OO15 04 20150a0OO210OOLOO210OO300400500600700IMF2包絡譜8009001000100 X: 1(200Y:

13、 0.2995100 X： 1200Y: 0.09067300400500600700IMF3包絡譜8009001000300400500600700IMF4包絡譜8009001000300400500600700IMF5包絡譜8009001000ELL-LLL-1 -.-«tCCrrrrr300400500600700IMF6包絡譜80090010000.010.00500 100 2008009003004005006007001000滾動體故障-(141.1 )滾動體故障的測試數(shù)據(jù)都不太明顯。原始信號及其頻率原始信號時域波形0.5-0.500.10.20.30.40.50.60

14、.70.80.9-1原始信號的包絡從上圖可以看出，故障信號頻率處的沖擊不明顯，而且和內外圈故障相比沖擊比較多且亂EMD分解IMF1時域波形圖00.10.20.30.40.50.60.70.80.9IMF2時域波形圖505 2 02 a a a a - -00.10.20.30.40.50.60.70.80.9IMF3時域波形圖0-0.100.10.20.30.40.50.60.70.80.9IMF4時域波形圖0.05 0 T護-0.05 100.10.20.30.40.50.6IMF5時域波形圖0.70.80.90.050-0.0500.10.20.30.40.50.60.70.80.9IMF6時域波形圖0 0.10.20.30.40.50.60.70.80.90.020-0.02IMF分量的頻率OO420OOIMF1頻譜100020003000IMF2頻譜400050006000OO420OO100020003000IMF3頻譜400050006000OO210OO100020003000IMF4頻譜4000500060000.010.00500OO0Z1OOO210100020003000IMF5頻譜40005000600050004000200010003000IMF6頻譜6000100020003000400050006000IMF