`C-F剛,山FM|尻cル沢Y106Zg30805TheApplicationofHoIographiclnterferometry
totheStudyofDiscBrakeNoise
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John、.Fieldhouse
TheUniVersityofHudde前eId
PeterNewcomb
LoughbmoughUnjv.
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ABSTRACT
、Anexperimentalilwesd鴎tionofpassengercaェdiscbTakenoisel四sbeenmadeusingthedoublepulsedlaseTholo厚aphictechnjque,deveIopedtoanowshnultmeous
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-tovibraLeinavanetyofmodessuchasbendmgbto庵ionandoftenacombh辺dmofbothanddmpadendOu[teris
:showntomakeas噂UncantcomibutiontobrakesystemlnoiSe・AsemSofhologJ園msofthebrakeemimngmstan
inXgnnitteuItnoiseandthenacondnuousnoiseshowUnatthe dscwavefbmDisnotstadonalyandthatitismovingwih Z色specttobodlthecaUiPerandth巳disc.F、喝emoにmentlsshowntotakeplacewhenasing1ehologmmisviewedmm diffbr巴ntposition3whjchpmvidessupportingevidencethat
,thew已爬fbmlisnotstadonalyinspace・Most定centtestsshowthatthewavefbZmdoesrotateaboutthediscatamte
-equivaleJmothe日eqUencyofvibramndividedbythe,dhmemlmodeord“
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TheomhogomlviewsofthebrakesyぢtemshowthatthediscZimism丘も、旧mghdeぴちeofh垣。d進phcemeTlLmBisshownupbyUuenh唱旧softheanthlcdes~bemgahno5tpamndtomediscmceindicamglbgluIat2mmspIacemmQ alongUlea五softhediscbcomparBdtommtiomldi5PlacemmLItismoreuSUallbrUleEfngestobe alteエmtdy包唱dedtothed産cmccasinHgエエU5.FuⅡmemoにitwouldaPPearmBtthe1aheTaM西phcpnentisasaにsmtofannnodepah5mo竝唱togempbanmdicalionoftwow冠肥nDnnssup国hnpose4a8同m6upW唾eanierobseT応poT酉(17).ms面manonis士oshownm厨gmE11whereUueB℃qUごlcywBs5900HzTheにcoumuctioncUemyshows口Coupled口mdnodepahsofa6damet曰『modeofvibrBIion,URefburmtemue凸ateBntmodQ5bemgSuWres5edahnosttodlepositicmwh亟lh可睡actmgasnodes.
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7WAVEFORMMOVEDmNT WiUlintemUttentnoiseitmustbes亡essedU2atitmaybe亜as、画bleto鱈sumed画tthenodeposidon進bdJ壇p5xednatUle5画rtofeachno座iEm麺onandEU1ez己fbにouUy印w面唱mBmpT巳ssion山at由cwnvelbnnismoⅥⅡ喝Bec創醒eofd由possibn町mru1eThwesdgaHonswp己madeofacmUtmmusnodg垈亙h画箇亜一
INVESTTGATIONS
WithamvdHJ屯ww℃UUeampUmdewmmwaysbeatamamnnmbu鱈posiIionvmeswheT巳aswimasta5onmyvmve唾PC罰Uonz■mBmthesGmebut通mPUmdevmi-
136
T1uBng■句8howmCmPnotincluBdedbullheに皿1町宙emduded
IbTcompleOen函.7.2.ContInuousNolge
T1江でeholo毎口、3百王にcoudedofacontinuousn前sewitha5巳que81cyof76SOHヱT11ed色CSPeedwaS5dminanticIockw山eandduehsごwas5red山mgthehandsetU挺可己f、ごgivtngccmpletelymndomにsul■・Tb[TUmm醸咋
麓l:M:::穂:;鰯:::鴎鱸磯X::lHMi既amtl胆rpmtewEsloadBdinohoIdEramdU血swas(hene卒oeedThed泗已eholo8mmsw王aUにcmdedwithiJlapenodor60swiIhtimeに藻teredLserpmses図、n国semGごsconnmUngdfs、7hcdⅥCeにconshuctionsofUmstest
…shownin同日Ⅲ配12(a9whichBg曰mindica摩UmtnotouUydoesUlevm泥fbmUmoに館htWetothedLcbImmLo
にhRiVeOOeamLIt画nOtaSmtiOmn'稲VeSmCeitSPOSidOn画Bembovmyncr酉itapm造mVeUh咽vmvesincethc8mpliUdCLJsosemtovnIy・Itm山tbenotedth8tthemttwqmPide麺Cs、己3,'四vev己Ty3im血rnodeQ5xh喝3画.
,WhenmeaBmimBlhemowmEnItheTewasaneedlolIHke imoaccouJltthecasewh匂亡lhewavemByhavemcvedmoにlhamonch81fpitch(lm6Ihormtationsimceitigan8
diameteTmodeofvibmUon).T1Uswasdetennmedbynodng lhent唱eBJ喝lesontheuimofthed進cBs5eeninIhetopviewofthefminte可fbm厚nmmotshowTMomaximisediscdet8n).Ach…eimaJ喝lewouldindicateaphBseshiftoTmovementofhalfanodepitcILInallcasestheTewasn⑥ plmseslUflwhichmeaI唾thewaVehadeilheTmovedlhe
色stBncepにsentedinthemblcaboveorthatthewavehadmovedBt1eastonenodepitclL43o,PeTIimeincTpmentin BddidouutotheabovedisplBc巳menLIfthhweTethec8seUlenlhewavewouldbeIC⑱。】喝Btamteor854de毎Ceヨ似swhichr巳、造squ■8,画tionormoreIhBntwiceUle
。
陸qumcy.
Thelim5etof膣ultstook8minutestorecordBndilis
s屯】匝camtonotethatlheBmpUmdeorthedURcmodewavefbmwaneslitUeacTossIheZHngeo「imRge潟whichiRwhBtwoumocmrwithabaveUh喝wave・As色tiouHaIywBvewou1dexlUbitavaIW垣ampUh」deinaddidoIIlothelixmmodeposition.
meaboにtest3.WithinteTmittemtmdcontinuousnolse・
showwwemovpnentofacomplexnatuⅡ巴tobepTesent、Porhm肥Tm皿y乱sp冗忠behseT団89巴nng由定quiIEd.
'9鰯、(兵i3TImedDelayTnggenngTbdetectd血cwnvemovp而亜t亜jdehPnnineitsdimectjonit
w面sneces8aⅣto3dectadammwhicb■lmownnotto
move,such四mcpndsofoneonhepads,Acondnuo山non8cmges色bUshedatlO750HzwilhIhed遇crotBdJ咽anticLock冨内seatlOⅥ/mhLthehSごP山espBロエ垣wBssctatl四】f昨pe耐odofv化mdon47113,8」tdimBgcs…oTdedatmcmBasmgd」ayintewHLofamumd3脾.FmmphotogmP殖ofme『己congmctedhologmms,asshowninF尊亜13(whichshowrmlyevpyoUu臼rにc、四回ction),itwnspo3BibIelomea8umed随avpp3gmtatiomlmovemmtofthcantmodesfbr-hincT■mmtofdelay・Itwas8ssumedthatthewav壱fbTmmovedanticIockm3ewithlhedisc・TheUme
dLhyw西detemfned6mnthebserpulseノ丘已quenqに己g=Qmp化ttedagBhmdLcmodcmovcmmtGsshowTlinF垣14.丁1旛B1opeofdxe…phgivesmemにofmovemmtBs20四dB淳eewhjchcompames色vomblywiuUthemueof2,07脾ヅ。e伊PcrthCwnにfbmOmmteSaMhe8層memted犀qUemcydMdedbWhedmme位almodeom句,1344虎econdT1Us℃isaho81mwnlbTcompaIisouuonthesamegmphandis
semtovmylittienomIheに3t函Ultamedeぴこeofmov巳mmt【breachhnagehasfbUow己mtnblel:
8CONCLUSIONS
msBtudym6BhownUmtthediscmodei8alwaysd血mebalandUmtitmmtBsaboutthcd心cwitha錠quencyequivalenttothevibmtion歴qUencydWidedbythediscmodeord可.
P口剴s迫1m画sewasonenfbundbbeclosetolhennh0,1
犀quemcicsbfthcdiscmdpad.N碗sepmpE可画iIymaythemfbuEbelinkedtothecoup“ofthenamalBequenqes ofIhemdividuaJpaItswhEntheyareclosek面e1h句(8,10&'9.Th造indica瞳thattheinmductionorasymmebyintolhemtoTmaybeasolutiontoinhjbittheibumationof symmet㎡cal凸mnemlmode8ofvibmtjonBndUletmdencytogpnem蛇noisebaconclusionにachedbyN画hwn吋(IDandLangmdNewcomb(11)withtheirsmdyo「dJumbFnk昼
綱nwns化undmatpadvitmtioncBnmakea乱gmjlicanlcon団budontoUlenoi8ctemdencyofabmkc5y5tem.
Holo2mphicinteTfとmmeセycanBssbtinvisudisb喝lhemodesofvibmnoninanoisybE曰kesystemandinaddiIionOo凸sphcementcan印vcsomcimdicationofplmseandd血石ctimofdrpbcemmt.
Tab粕XRe劃血bsoravp己gEdmdnodemovcmentfbreachd而旛dehyhtc定mmL
GenemnylhepadSVibmtelOoouto「phasewiUulhedisc whichcausesthe・toPhat・secuonorthedscIobedispIaccd m・pha3ewiththed血c、
gACXNOWLEDCEMENTS
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137
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11.LANGAM・andNEWCOMB
hwesd8FmonintoDnmBrake l0REFERENCES
No.C38コ“I,EAECconib矼已、“onNew
DevdcpmemsinPowem3mandChass遊画喝inc、Ⅱ喝,S⑪asbouエ9,1989.
12.PELSXEAamHAPPEA・VibmtionAnalysisbyDoublePulSedLaseTHO1ography”SAEPaperNo、770030,De亡Cit1977.
13.FELSKEA,HOPPEG・andMATTTIAIH
1mOscmatic殖inSqueah喝DiskBI召kes‐AnalysisofVmratmgModesbyHolOg戸aphiclntpfbzcmeセy耐SAEPaperNo780333oD巴mitllだ.
14.FELSKEA,HOPPEQandMATITIAIH・nASmdyofDmmBmkeNo蜂byHoloPaplucInh江f:mmmy卿SAEPaperN0.800,1,1180.
15.FIELDHOUSEJ.D・andNEWCOMBTP・RAn
hwesUgationlntoDiscH白keNoisePSingHoloEmphicln垣fbmmehy"3rdlnhEmationalEAECConfbrmceon
VehideDynamibsandPowemamEngm琵血唱一EAECNo.,10“』umBl”1,sセョsbomg
ldFIELDHOUSEJD・mdNEWCOMBTP,Tnle
TとdmiqN』eofHologrHplmclnt面fbmme江yusedtolmlesdgateuScBr3keNoise”‐西thSUV画JUbnee
lntBmanonalSymposmmonAmomotive庇clmolo風andAutomationOSAm)‐nLaseTAppUcationsfbrdue Automotjvelndusセァ'Flolmcebltalybl-5Junel91Zref 兎1023、
17.FIELDHOUSEJ.、、amNewcCmbTP・pAZ1
mesUgationmtomscBrakeNoiseUSmgHolOi廟aPlUclnteエfbmmeせy卿Autotechl”LNECBimm1gimm.
1- LAMARQUEPM”BIzk巳SqUeakTTleExpmencesof
MBnu色ctuエ造rSandOpemto毎andSomePTごuエTunaエyExperimentsI,RepoItNo,8500日1J四titutionofAubomobUeEJtgdneers,ReseaⅡdlandSt8ndnェds Committ龍,1135.
BASFORDP・ILandTWISSS.B・nPmpertiesofHicdonMate配i21sn・TheoryofVHbmtiorlinBmakesnASME・征、遇.VoL80,19麹”402斗10.
SPURRRT・pATheoryofB垣keSquearoLMechEAuto,Div・PICC,No.11%1/、pp33斗0.EARLESamCHAMBERSjoDiScBrakeSqUealNoise GmemtionPredicth喝itsDependemcyonSy百temPar2met率hlcludingDampingPIntematiohalJouエmlofVehicleDes噂Wol8,no54,5,6pp5335521987・JARⅥSRP・andMILLSB.”VibrationslnducedbyDIyHiction鰍PICC,IMeclEll63-64,voll78ptlN0.32pP847B6d
NORITIM・RqmscBXHkeSqu色al-ATheolPticalMode1"MIRAReseaエchRgpoエtNQI972/5. MILLNERN."AnAnalysiSofD造cB戯eSquearSAEPaperNO780332Demitllだ.
MURAKAMIH.,TSUNDAN,andKm4MURAT,徳A
SmdyConcemedwithaMechamsmofD由cBmke
SquealpSAEPaperNQ841233Michi臼3,1984.LILESG”AnAnaly5isofnscBrakeSqUealUSing FmiteE1ementMethods"SAEPaperNo、811150,11m・NISH[WAXIM.,HARADAH.,OKAMURAHand
IKEUCHIT風StudyonDi5cBrBkeSquearSAEPaperNo.890864,1989.
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