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外文资料--Dynamic Analysis of Fo ur -Bar Be ating -upMechanismwith Joint Cle arance.pdf

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外文资料--Dynamic Analysis of Fo ur -Bar Be ating -upMechanismwith Joint Cle arance.pdf

DYNAMICANALYSISOFFOURBARBEATINGUPMECHANISMWITHJOINTCLEARANCEXUEWENLIANG1,CHENGUOZHENS2,CHENGE3,ZHUZHANGCHENC71,CHENGLONGDIHš11KEYLABORATORYOFTEXTILESCIENCETECHNOLOGY,MINISTRYOFEDUCATION,DONGHUAUNIVERSITY,SHANGHAI201620,CHINA2SHANGHAISHENANTEXTILECO,LTD,SHANGHAI200020,CHINA3COLLEGEOFMECHANICALENGINEERING,DONGHUAUNIVERSITY,SHANGHAI201620,CHINAABSTRACTFORTHEFOURBARBEATINGUPMECHANISMOFAIRJETLOOM,THEPLAINBEARINGOFLINKAGEISTHEBEARINGWITHDYNAMICLOAD,ANDISIMMERSEDINTHELUBRICANTBOXIFTHEJOINTCLEARANCEISCONSIDERED,THERESEARCHONLINKAGEMOVEMENTCOULDBEVERYCOMPLICATEDINTHISPAPER,THEKINEMATICCHARACTERISTICSOFFOURBARBEATINGUPMECHANISMWITHJOINTCLEARANCEWERESTUDIEDBYANALYZINGTHETRACEOFJOURNALCENTERANDTHEBALANCEOFRADIAL,TANGENTIALFORCES,ANDBEARINGLOADTHEREGIONOFPRINCIPALVIBRATIONANDITSFORMINGCAUSESWEREDISCUSSEDANDTHERESULTSCOULDINTERPRETTHEMEASURINGCURVESOFFOURBARBEATINGUPMECHANISMCOMPLETELYKEYWORDSDYNAMICANALYSIS;FOURBARLINKAGE;BEATINGUPMECHANISM;JOINTCLEARANCECLCNUMBERTS1933DOCUMENTCODEAARTICLEID16725220201004055907INTRODUCTIONFORTHEFOURBARBEATINGUPMECHANISM,THECRANKSHAFTBEARINGANDROCKSHAFTBEARINGARETHEBALLBEARING,ANDTHECOUPLEJOURNALBEARINGANDCRANKJOURNALBEARINGARETHEJOURNALBEARINGTHECRANK,COUPLER,ROCKER,ANDTWOJOURNALBEARINGSAREALLIMMERGEDINTHELUBRICANT,ANDTHEREISTHERADIALCLEARANCEBETWEENTHERINGANDPINOFJOURNALBEARINGTHECLEARANCEISHELPFULTOTHERELATIVEMOTIONOFLINKSBYPROVIDINGTHESPACEOFMOVINGANDLUBRICATING,BUTITALSOLEADSTOTHEDISCONTINUOUSMOTIONOFKINEMATICPAIR,WHICHISTHEMAINREASONTOAFFECTTHEMECHANISMDYNAMICCHARACTERISTICS13FORTHEMECHANISMSTRANSFERRINGTHEFORCEANDMOMENTAPPLIEDINTHEINDUSTRYMANUFACTURING,ASTHEJOINTCLEARANCEENLARGINGTHEDYNAMICCHARACTERISTICSWILLBEDESTRUCTIVEUNDERTHECONDITIONOFHIGHSPEEDANDHIGHLOADTHEJOINTCLEARANCEOFFOURBARBEATINGUPMECHANISMISWITHINTHERANGEOFTOLERANCEIFRUNNINGSMOOTHLYSOMECLEARANCEINTHEJOINTOFMECHANISMISALWAYSNECESSARYBUTTHECLEARANCEISOFTENINCREASEDBYWEARING,THENTHEIMPACTFORCESCOULDCAUSETHEVIBRATION,NOISE,BEARINGDETERIORATION,ANDTHEWEARCOULDALSOBEINCREASEDTHEREFORE,THEVIBRATIONSBECOMEONEBASICSTUDYCONTENTABOUTMECHANISMKINETICSXIETALSTUDIEDTHERELATIONBETWEENTHEDYNAMICBALANCEANDTHEVIBRATION4,ANDSOONGETALSTUDIEDTHEDYNAMICCHARACTERISTICSOFCRANKSLIDERWITHJOINTCLEARANCE5THEDYNAMICALTERNATINGLOADISENDUREDBYTHEJOURNALBEARINGOFFOURBARBEATINGUPMECHANISMTHEFORCESOFLINKSARETRANSFERREDBYTHEOILFILM,ANDTHEPINCENTEROFCOUPLEJOURNALMOVESONTHETRACEWHENTHEECCENTRICITYISLITTLE,THEMOTIONOFROCKERISUNSTABLE,WHICHSHOULDLEADTOTHEINSTANTANEOUSIMPACTBETWEENTHERINGANDTHEPINANDMORESERIOUSWEAR,SOTHESTRONGVIBRATIONWILLHAPPENMOREFREQUENTLY1FOURBARLINKAGEWITHJOINTCLEARANCEIFTHEJOINTCLEARANCEOFMECHANISMISZERO,THECENTERSOFBEARINGANDJOURNALAREINTHESAMEPOSITIONBUTIFTHECLEARANCEAPPEARS,TWOCENTERSWILLBESEPARATED,WHICHCANRESULTINTHEECCENTRICITY,ANDTHEREISTHEEXTRADEGREEOFFREEDOMFORTHEMECHANISMTHEBEATINGUPMECHANISMWITHJOINTCLEARANCEISSHOWNINFIG1,WHICHISTHECRANKROCKERINVERSIONTHEBEARINGBISMADEUPOFCRANKANDCOUPLER,THEBEARINGCISMADEUPOFCOUPLERANDROCKER,THEROCKERSHAFTBEARINGDISMADEUPOFROCKERANDGROUNDLINK,ANDTHECRANKSHAFTBEARINGAISMADEUPOFGROUNDLINKANDCRANKFORTHEBEATINGUPMECHANISM,THECONNECTINGARMPINBEARINGCISEASIESTTOBEWORN,SOITISASSUMEDTHATTHEREISONLYTHECLEARANCEBETWEENTHECOUPLERPINANDRING,ANDNOCLEARANCEINOTHERTHREEBEARINGSINTHISPAPER,THEMEASURINGLOOMISTHEZA203AIRJETLOOMANDITSSPEEDIS450R/MINXYREFERENCECOORDINATEFRAMEOFMECHANISMSHOWNINFIG1ISSETACCORDINGTOTHEPRACTICALWORKINGPOSITIONTHEORIGINISTHEBEARINGCENTEROFCRANKSHAFTA,ANDTHECOORDINATEOFROCKERSHAFTBEARINGDCENTERAREXD8MMANDYD1598MMTHEOTHERPARAMETERSARE559JOURNALOFDONGHUAUNIVERSITYENGEDVOL27,NO42010RECEIVEDDATE20090115CORRESPONDENCESHOULDBEADDRESSEDTOXUEWENLIANG,EMAILXWLDHUEDUCNSHOWNINTABLE1FIG1FOURBARLINKAGEUSEDFORBEATINGWEFTUPINTOCLOTHTABLE1MAINPARAMETERSOFFOURBARMECHANISMLINKAGELENGTH/MMMASS/KGMOMENTOFINERTIAL/KGCM2CRANKAB353580155COUPLERBC75227114ROCKERCD1451042528SLEYANDSLEYSWORDDE64953728GROUNDLINKAD160THESLEYANDSLEYSWORDDEISTHEWORKINGLINKOFFOURBARMECHANISM,WHICHISINTEGRATEDWITHTHEROCKERWHENTHESLEYRECIPROCATES,THEREEDPUSHESTHEWEFTINTOTHEFELLOFCLOTHFORTHEINERTIAOFSLEYANDSLEYSWORDDRIVENBYTHEROCKERANDELBOWPOSITIONOFMECHANISMFORTHELINKSOFFOURBARBEATINGUPMECHANISM,THEMASSOFSLEYANDSLEYSWORDINCLUDINGTHEROCKERISMUCHHEAVIERTHANOTHERLINKSTHEMAINBODYOFROCKINGSHAFTISTHESTEELTUBEOFLARGEDIAMETERTHEMOTIONOFROCKERISSTABLEANDITSPROPERTYOFANTIJAMMINGISWELL,SOTHESLEYSWORDISCHOSENASTHEMEASURINGOBJECTIVEOFBEATINGUPMECHANISMACCELERATIONCURVEAPIEZOELECTRICACCELEROMETERISADSORBEDONTHESLEYSWORDDIRECTLYBYTHEMAGNETICSEAT,WHICHISSHOWNINFIG2THESLEYSWORDISSHORTANDSTRONG,WHICHOUTPUTSIGNALCOULDREFLECTSENSITIVELYTHEDYNAMICCHARACTERISTICSOFFOURBARLINKAGETHEMEASURINGACCELERATIONCURVEOFSLEYSWORDISSHOWNINFIG3,WHICHACCORDSWITHTHETHEORETICALACCELERATIONCURVE,ANDCHARACTERIZEDIN1THECURVEISNOTSMOOTH,WHICHMEANSTHATTHETHEORETICALSMOOTHCURVEHASBEENADDEDBYTHEOSCILLATIONSWITHDIFFERENTFREQUENCIESANDAMPLITUDESSEEFIG4FIG2SKETCHOFMEASURINGPOSITIONFIG3MEASURINGCURVEFIG4CONTRASTBETWEENMEASURINGCURVEANDTHEORETICALSMOOTHCURVE2THEOSCILLATIONSWITHDIFFERENTFREQUENCIESEXPRESSSTRICTPERIODICAL,ANDTHEDIFFERENCEISONLYTHEAMPLITUDESSEEFIG3FORTHEFOURBARBEATINGUPMECHANISMWITHFIXEDGEOMETRICALANDKINEMATICPARAMETERS,INTHEFIRSTTWOOR560JOURNALOFDONGHUAUNIVERSITYENGEDVOL27,NO42010THREEYEARSTHEOUTPUTACCELERATIONSIGNALOFMECHANISMWILLAPPEARAGAINCORRECTLYINTHENEXTPERIOD,ANDTHEVIBRATIONPULSEWITHFIXEDFREQUENCYANDAMPLITUDEWILLALSOAPPEARAGAINEVERYPERIODOFCRANKANGLESOTHEOUTPUTACCELERATIONSIGNALOFFOURBARBEATINGUPMECHANISMWITHJOINTCLEARANCEISNOTTHERANDOMSIGNAL,BUTTHEMAINBODYOFSIGNALISTHESIGNALWITHTHESTRICTPERIODICITYTHEOUTPUTCURVEOFMECHANISMISMAINLYMADEUPOFSIGNALSWITHTHESTRICTPERIODICITY,ANDALSOINCLUDESSOMERANDOMCOMPONENT3THERANDOMCOMPONENTOFVIBRATIONWILLINCREASEASTHEWORKINGTIMEOFLOOMTHATISTOSAYASTHEWORKINGTIMEOFMECHANISMINCREASES,THERANDOMCOMPONENTOFOUTPUTCURVEWILLBEGRADUALLYIMPROVEDSHOWNINFIG5,BISTHEINCLUDEDANGLEOFCOUPLERORITSEXTENDEDLINEANDCRANKWHENB0BOR180B,THECRANKANDTHECOUPLERAREINTHESAMELINE,ANDWHENTHEACCELERATIONOFCRANKISZERO,THEMECHANISMISINTHEPOSITIONOFELBOWLINKWHENB90BOR270B,THECRANKANDTHECOUPLERAREVERTICALEACHOTHER,ANDTHEACCELERATIONOFCRANKISLARGEACCORDINGTOTHEFOURSPECIALPOSITIONSABOVE,THESWINGPROCESSOFSLEYCOULDBEDIVIDEDINTOFOURREGIONSFIG5BANGLEOFFOURBARMECHANISM2RELATIVETRACEOFCOUPLERPINCENTERWITHJOINTCLEARANCEATSTATICBALANCEPOSITIONACCORDINGTOTHEMEASURINGCURVE,THEREISTHEIMPACTOFLINKSINTHEJOINTCLEARANCEBYMEASURINGTHECLEARANCEOFCRANKBEARINGIS2LM,ANDTHECLEARANCEOFCOUPLERPINJOURNALIS42LMSOITCOULDBECONCLUDEDTHATTHEIMPACTINTHEJOINTCLEARANCEWILLHAPPENMAINLYINTHECOUPLERPINJOURNAL21COUPLERPINJOURNALWITHCLEARANCETHEREARETWOCYLINDERSOFPINHOLEANDJOURNALSHOWNINFIG6THERADIUSOFJOURNALBEARINGHOLEISR,THERADIUSOFJOURNALISR,ANDTHERADIUSCLEARANCEISCRRTHEDISTANCEBETWEENTWOCENTRALLINESOFCYLINDERSISTHEECCENTRICITYEC1C2THECOUPLERANDTHEROCKERCONNECTEDBYTHECOUPLERJOURNALBEARINGAREBOTHMOVABLEPARTS,SOTHEBEARINGANDTHEJOURNALAREALSOBOTHTURNINGTHEREISTHEOILBETWEENTWOCYLINDERS,ANDTHETHICKNESSHOFEXTRUSIONFILMISHCESINHC1ESINH,1WHEREEE/CISTHEECCENTRICITY;HISTHEANGLEINCLUDEDBETWEENHANDC1C2INTHEVERTICALDIRECTIONFIG6GEOMETRICDIMENSIONOFJOURNALFORRADIALLOADFISTHETOTALLOADOFJOURNALBEARING,UBCISTHELINEARVELOCITYOFPINALONGTHEPINSURFACE,ANDUCDISTHELINEARVELOCITYOFJOURNALALONGTHERINGSURFACESEETABLE2TABLE2MAINPARAMETERSOFCOUPLERPINBEARINGNOMINALDIMENSIONOFJOURNALBEARINGHOLEANDJOURNAL2R/MMWIDTHOFPLAINJOURNALBEARINGL/MMVISCOSITYCOEFFICIENTOFLUBRICANTG/NSM1RADIUSCLEARANCECRR/MM404200175002122JOURNALCENTERTRACEOFSTATICBALANCEPOSITIONTHECRANKANDTHECOUPLERAREBOTHIMMERSEDINTHELUBRICANTBOXTHELUBRICANTINTHEJOINTCLEARANCEOFJOURNALANDBEARINGWILLTURNWITHTHEMTHEREISTHEHIGHERHYDRODYNAMICPRESSUREINTHEREGIONOFLESSCLEARANCE,ANDTHELOWERHYDRODYNAMICPRESSUREINTHEREGIONOFLARGERCLEARANCE,WHICHLEADSTOTHEDELIVERYHEADTHEBEARINGLOADISENDUREDBYTHEHYDRODYNAMICPRESSUREOFLUBRICANTFORTHEEFFECTOFOILWEDGETHESTATICBALANCEPOSITIONOFJOURNALCENTERISTHEBALANCEPOSITIONOFOILFILMFORCEANDBEARINGFORCETHEREISTHEDIFFERENCEBETWEENCOUPLERPINJOURNALANDORDINARYRADIALBEARING1THEDIRECTIONANDINTENSITYOFLOADONTHECOUPLERPINJOURNALALTERNATEASTHETIME2THESWINGVELOCITYOFJOURNALANDBEARINGCHANGESASTHETIMETHERELATIONBETWEENBEARINGLOADFANDDIMENSIONLESSOILFILMFORCE–ISSHOWNINEQ265FC/R2GUBCUCDL,2561JOURNALOFDONGHUAUNIVERSITYENGEDVOL27,NO42010WHEREFISTHEBEARINGLOAD,GISTHEDYNAMICVISCOSITY,ANDUBCANDUCDARESHOWNINFIG6ACCORDINGTOTHEDATAINTABLE3,THEBALANCEPOSITION7NF,C1C2COULDBESOLVEDBYTHEINTERPOLATIONTABLE3BEARINGPARAMETERSOFCIRCULARCYLINDERRATIOOFWIDTHANDRADIUSL/2R10ECCENTRICITYE010020030040050060070ECCENTRICANGLE7/B7511635955555008453240543602OILFILMFORCE–X0197041506801029152422963654THEJOURNALCENTERTRACECOULDBEDRAWNACCORDINGTOTHEECCENTRICANGLEANDTHEECCENTRICITYTHEJOURNALCENTERTRACEOFBEARINGWITHTHESTATICLOADUSUALLYISSEMICIRCLEBUTTHELOADOFCOUPLERPINJOURNALWILLVARYINTHESIZEANDDIRECTIONASTHETURNINGOFCRANK,SOTHEJOURNALCENTERWILLMOVEALONGTHETRACEOFSTATICBALANCEPOSITIONTHERELATIVETRACEOFJOURNALCENTERSTATICBALANCERELATIVETOTHECOUPLERPINJOURNALHOLESHOWNINFIG7IS8SHAPEDTHEPOLARANGLESHOWNINFIG7ISTHEDIRECTIONANGLEOFHOLE,ANDTHEPOLARRADIUSISTHEECCENTRICITYACCORDINGTOTHEFIGURE,THEREARETHREETIMESFORTHEJOURNALCENTERCOMINGINTOTHECIRCLEOFE01WHENTHECRANKANGLEISAT72B114B,ITISTHEFIRSTTIMEFORTHEJOURNALCENTERCOMINGINTOTHECIRCLE,ANDTHELEASTECCENTRICITYIS0001LESSECCENTRICITY,FIG7RELATIVETRACEOFJOURNALCENTERSTATICBALANCERELATIVETOHOLETHEMARGENTANGLEISTHECRANKANGLETHESYSTEMSTABILITYISWORSEANDWORSEWHENTHECRANKANGLEISAT178B192B,ITISTHESECONDTIMEFORTHEJOURNALCENTERCOMINGINTOTHECIRCLE,ANDTHELEASTECCENTRICITYIS0098WHENTHECRANKANGLEISAT302B338B,ITISTHETHIRDTIMEFORTHEJOURNALCENTERCOMINGINTOTHECIRCLE,ANDTHELEASTECCENTRICITYIS0001ANDTHEREARETWOTIMESFORTHECENTERTOUCHINGTHEOUTERCIRCLEOFE1,WHERETHEANGULARVELOCITIESOFCOUPLERANDROCKERRELATIVETOTHEBEARINGLOADFARETHESAME,BUTTHEIRDIRECTIONSAREREVERSE,ANDTHEIMPACTWILLHAPPENBETWEENTWOLINKS23BALANCEBETWEENOILFILMFORCEANDBEARINGLOADFNISTHEREACTIONFORCECOMPONENTINTHEDIRECTIONOFLINKBCLENGTH,ANDFTISTHEREACTIONFORCECOMPONENTINTHEVERTICALDIRECTIONOFLINKBCBETWEEN80BAN

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