包络分析

Page1270103EnvelopeAnalysis,1Copyright©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentszzPULSE––z––––Page2©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents:–FFT–––––––...©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents1::.2:::?:?ContentsPage3©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents?:.::.:/.:.©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents?:.......................Page4©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentszzPULSE––z––––©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentsImRefc+fmfc-fmfcAcAm/2Freq.fc+fmfc-fmfcAm/22Ac/2TimeFreq.fmAc-AmAc+AmAcPage5©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents1/THz:1/T=Frequency(e.g.)m/s2TT’1/THz’=“”Hz©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentszzPULSE––z––––Page6©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents?FFT://©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents?BPFI:BPFO:dfHzPage7©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentszzPULSE––z––––©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents:••••Page8©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentsSKF©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentszzPULSE––z––––Page9©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents01/THz:1/T=Frequency(e.g.)m/s2TT’1/THz’=“”Hz©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents1..Time(Excitation)-CurrentWorking:Singleimpact:Input:FFTAnalyzer60m80m100m120m140m160m180m200m02004006008001k1.2k1.4k[s][N]Time(Excitation)-CurrentWorking:Singleimpact:Input:FFTAnalyzer60m80m100m120m140m160m180m200m02004006008001k1.2k1.4k[s][N]Time(Response)-CurrentWorking:Singleimpact:Input:FFTAnalyzer80m120m160m200m240m280m320m360m400m-30-20-100102030[s][m/sTime(Response)-CurrentWorking:Singleimpact:Input:FFTAnalyzer80m120m160m200m240m280m320m360m400m-30-20-100102030[s][m/sAutospectrum(Excitation)-CurrentWorking:Singleimpact:Input:FFTAnalyzer04080120160200240280320360400-60-50-40-30-20-1001020[Hz][dB/1.00N]Autospectrum(Excitation)-CurrentWorking:Singleimpact:Input:FFTAnalyzer04080120160200240280320360400-60-50-40-30-20-1001020[Hz][dB/1.00N]Autospectrum(Response)-CurrentWorking:Singleimpact:Input:FFTAnalyzer04080120160200240280320360400-80-70-60-50-40-30-20-100[Hz][dB/1.00m/sAutospectrum(Response)-CurrentWorking:Singleimpact:Input:FFTAnalyzer04080120160200240280320360400-80-70-60-50-40-30-20-100[Hz][dB/1.00m/s––––Page10©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContents:2.“”‘1/THz’.:.Time(Excitation)-InputWorking:Input:Input:FFTAnalyzer0200m400m600m800m11.21.41.61.804008001.2k1.6k2k[s][N]Time(Excitation)-InputWorking:Input:Input:FFTAnalyzer0200m400m600m800m11.21.41.61.804008001.2k1.6k2k[s][N]Autospectrum(Excitation)-InputWorking:Input:Input:FFTAnalyzer04080120160200240280320360400100u1m10m100m1101001k10k[Hz][N?Hzs]Autospectrum(Excitation)-InputWorking:Input:Input:FFTAnalyzer04080120160200240280320360400100u1m10m100m1101001k10k[Hz][N?Hzs]Time(Response)-InputWorking:Input:Input:FFTAnalyzer0200m400m600m800m11.21.41.61.8-60-40-200204060[s][m/sTime(Response)-InputWorking:Input:Input:FFTAnalyzer0200m400m600m800m11.21.41.61.8-60-40-200204060[s][m/sAutospectrum(Response)-InputWorking:Input:Input:FFTAnalyzer040801201602002402803203604001u10u100u1m10m100m110100[Hz][(m/s??Hzs]Autospectrum(Response)-InputWorking:Input:Input:FFTAnalyzer040801201602002402803203604001u10u100u1m10m100m110100[Hz][(m/s??Hzs]TimeFrequencyTimeFrequency©2003Brüel&KjærSoundandVibrationMeasurementA/S.AllRightsReservedContentsFourierSpectrum(Response)-Input(Magnitude)Working:Input:Input:FFTAnalyzer020406080100120140160180200012345678[Hz][m/sFourierSpectrum(Response)-Input(Magnitude)Working:Input:Input:FFTAnalyzer020406080100120140160180200012345678[Hz][m