发动机NVH测试与分析_ch

[e-mail]–LMS,28…100.000500030…850…30%…25LMS,LMSEngineeringLMSTest.LabLMSTest.XpressLMSTec.WareLMSVirtual.Lab3DLMSTec.ManagerLMSImagine.Lab1DLMSItaliaTorinoLMSHQLeuven-BelgiumLMSGermanyGöttingenKaiserslauternLMSJapan-TokyoLMSTheNetherlandsLMSNACoralvilleLMSNA-DetroitLMSNALosAngelesLMSNAWashingtonD.C.LMSItaliaTorino–Novarra-MilanoLMSFranceLyon-ToulouseLMSFranceParisLMSUKCoventry-MiltonKeynesLMSHQLeuven-BelgiumLMSRussiaLMSGermanyGöttingenKaiserslauternLeonbergMarburgMünchenLMSChina-BeijingLMSChina-ShanghaiLMSSingaporeLMSJapan-TokyoLMSKoreaLMSChina-GuanzhouLMSJapan-NagoyaLMSRomaniaLMSTheNetherlandsLMSIndiaLMSNACoralvilleLMSNA-DetroitLMSNALosAngelesLMSNAWashingtonD.C.LMSItaliaTorino–Novarra-MilanoLMSFranceLyon-ToulouseLMSFranceParisLMSHQLeuven-BelgiumLMSRussiaLMSGermanyGöttingenKaiserslauternLeonbergMarburgMünchenLMSChina-BeijingLMSChina-ShanghaiLMSSingaporeLMSJapan-TokyoLMSKoreaLMSChina-GuanzhouLMSJapan-NagoyaLMSRomaniaLMSTheNetherlandsLMSIndiaLMSNACoralvilleLMSNA-DetroitLMSNALosAngelesLMSNAWashingtonD.C.LMSItaliaTorino–Novarra-MilanoLMSFranceLyon-ToulouseLMSFranceParisLMSUKCoventryLMSHQLeuven-BelgiumLMSRussiaLMSGermanyGöttingenKaiserslauternLeonbergMarburgMünchenLMSChina-BeijingLMSChina-ShanghaiLMSSingaporeLMSJapan-TokyoLMSKoreaLMSChina-GuanzhouLMSJapan-NagoyaLMSRomaniaLMSTheNetherlandsLMSIndiaLMSNACoralvilleLMSregionaloffices:30LMSrepresentativesoffices:25LMS,Europe40%US23%Asia37%LMSworldwiderevenuedistrubutionFromconcepttocertificationLMS,LMS,LMS…LMS…LMS701702()[e-mail]//NVHLMSCAEProductsPreferredPartnerofDassaultSystèmesNVH……!NVH......?►►Noise||1.2.3.1....2....3....=+=+==x=x/()=x…(/?)NVHHNVH=xf=50Hz…f=50Hz…7f=50Hz…???--/=XReceiverTransmitterSourcecriticaldynamics=XReceiverTransmitterSourcecriticalloads=XReceiverTransmitterSourceworstcasescenarioNVH,ΣΣ2ndorder2ndorderexcitationexcitationaccelaccelspectrumspectrumshapeshapeSPLSPLdiscretediscretefrequenciesfrequenciesSPLSPL2ndorder2ndorderexcitationexcitationaccelaccelharmonicharmonicpatternpatternaccelaccelmountmountcharactercharacter--isticsisticsdyndynstiffnessstiffnessBodyBodyNoiseTFNoiseTFdB/NdB/Nlevel&level&linearitylinearitydBdBdiscretediscretefrequenciesfrequenciesSPLSPLspectrumspectrumshapeshapeSPLSPLharmonicharmonicpatternpatternAccelAccelchassischassisdynamicsdynamicstransfertransferfunctionfunctionTransTrans--missionmissionLossLossdB/dBdB/dB++????1:NVH–ODS–2::4:1NVHNVH::10:1/3(4)[2[2,4,4,6,6,,……]][0.5[0.5,1.5,1.5,2.5,2.5,,……]][1[1,3,3,5,5,,……]]222+30%Rev/minHz5000216650028270003032(l/r)-()()500Hz()-LMSNVH&PLMSNVHODS/1/3ODS/ASQ1/3ODSASQ––&LMSNVH//ICP///QTV/CAN-bus(J1939),/ICP///ICP/////ICP///QTV/CAN-bus(J1939),/ICP///ICP///QTV/CAN-bus(J1939),,GPS/ICP//ScadasIIIScadasMobile&NVHADC/Typically:Fixedresponseaccelerations-Rovingimpactlocation&/-TimeTimeFrequencyFrequencyFRFFRF••••••LMS::(MIMO)::::-[N][m3/s2][m/s2][Pa](),,-p/F=-a/QvvsLMSPolyMAXFRFs,,,**1()nkkkkkAAHjj=ω=+ω−λω−λ∑vs-LSCELMSPolyMAXvs“LMSPolyMAX&S!”PoleselectionperuserPoleselectionfreqvsdampingLMSPolyMax-:,6dBHelicopterdesign6(SDOF)8–12(3DOF)–NVH––?()(,,,…)(,/,…)–Rattling:2500-3500rpm:-2to3degrees:20-40%::2.5-5kHzCroaking:1000-2200rpm:0–30degrees:10-50%::1.2-2.5kHzCroakorRattle:11-3kHz2-5kHzRattle-2˚to3˚Croaking(0˚–30˚)gates://ECU(720):(measuredvs.theoretical&floatvs.angle)(measuredvs.theoretical&bouncevs.angle):%/(2)Inc.EncoderCrankShaft1800pprOptel-ThevonG7AlternatorPulley60ppr:%=(1–1)/11=2x1.2.3.-4.-5.()tAngleDomainAccurateangletimerelationshipkHzNbrofrotatingshafts402001Mhz123456FixedSamplingNyquistFs=2xFmaxAngleDomainNyquistNumberofpulses/rev=2xOmaxDetailedangledomainvisualisation:UpsampleafterconversiontoangledomainNoneedtoacquirewithequivalentnumberofpulses/rev-capturedynamicsVbFmax10kHz(E.g.shaftresonance)RPM800-6000Numberofpulses/rev=10kHz/Minrotationalfrequency=Min750pprTachofrequency2078Tachofrequency=RotationalFrequency*PPRSCIIISCM*SCM+IESCMSCIIIAngledomainIntelligenttachohandlingCorrectformissing–doublepulsesUsemissingpulseasabsolutephasereference60-2teethwheelInputOutput1Output2InputOutputAngleDomainTracking–TriggeringEnginetestingspecifictrackingmodesFromangletracetoangleblockoranglewaterfallEnginetestingtriggermodesHowtocentreindividualangleblocks?timeangleslowc.StatFreeRunTDCChannelPre-triggerPost-trigger0º720ºTrackingValueAmplitudeAngleAngleDomainZoomedanalysisZoomedanalysisE.g.Gate1=valveinletGate2=Combustion0º720ºCycleGate1Gate210º100º200º450º500º720ºAngleDomainMulti-cylinderanalysisCylinderoffsetCompensationCyl1Cyl2Cyl3Cyl4E.g.firingorder:1-3-4-2OffsetCyl1:0ºOffsetCyl3:180ºOffsetCyl4:360ºOffsetCyl2:540º0º720º-0ºCyl1Cyl3Cyl4Cyl2180º360º540º720ºCyl1Cyl3Cyl4Cyl21440ºTDC-RefAngledomainProcessingDerivedchannelsE.g.subtractexternalreferenceblockMapstatisticsMapaverage,PeakHoldFrameStatisticsMax,Max(angle),Min,Min(angle),Extremum,Extremum(angle),Range,…MaxMax(angle)TrackingvalueTrackingvalueNVH••••//••••……••//••••••••……..tAmplitudeShaft1Shaft2ProximityprobePulsetypesignalsAccelerometers,,,,,,,,Gear