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外文翻译--在理论和实践方面叶片泵磨损的研究-为适应预测磨损计算模型.doc

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外文翻译--在理论和实践方面叶片泵磨损的研究-为适应预测磨损计算模型.doc

英文原文CaseStudyTheoreticalandpracticalaspectsofthewearofvanepumpsPartA.AdaptationofamodelforpredictivewearcalculationAbstractTheaimofthisinvestigationisthedevelopmentofamathematicaltoolforpredictingthewearbehaviourofvanepumpsuscdinthestandardmethodforindicatingthewcarcharactcristicsofhydraulicfluidsaccordingtoASTMD2882/DIN51389.Thederivationofthecorrespondingmathematicalalgorithmisbasedonthedescriptionofthecombinedabrasiveandadhesivewearphenomenaoccurringontheringandvanesofthepumpbytheshearenergyhypothesis,inconnectionwithstochasticmodellingofthecontactingroughsurfacesastwodimensionalisotropicrandomfields.Startingfromacomprehensiveanalysisofthedecisiveringvanetribocontact,whichsuppliesessentialinputdataforthewearcalculation,thecomputationalmethodisadaptedtotheconcretegeometrical,motionalandloadingconditionsofthetribosystemvanepumpandextendedbyinclusionofpartialelastohydrodynamiclubricationinthemathematicalmodej.Forcomparisonofthecalculatedwearbehaviourwithexpenmentalresults,atestseriesonarigdescribedinPartBwascarriedout.Amineraloilbasedlubricantwithoutanyadditiveswasusedtoexcludetheinfluenceofadditiveswhichcannotbedescribedinthemathematicalmodel.Agoodqualitativecorrespondencebetweencalculationandexperimentregardingthetemporalwearprogressandtheamountofcalculatedwearmasswasachieved.KeywordsMathematicalmodellingSimulationofwearmechanismsWeartestingdevicesHydraulicvanepumpsElastohydrodynamiclubricationSurfaceroughness1.IntroductionInthisstudy,thepreliminaryresultsofanewmethodologicalapproachtothedevelopmentoftribometersforcomplicatedtribosysLemsarepresented.Thebasicconceptinvolvesthederivationofamathematicalalgofithmforwearcalculationinaninteractiveprocesswithexperiments,whichcanbeusedmodelofthetribosystemtobesimulated.Inthisway,anadditionaldesigntooltoachievethecorrelationofthewearratesofthemodelandoriginalsystemiscreated.TheinvestigationsareperformedfortheVickersvanepumpV104CusedinthestandardmethodforindicatingthewearcharacteristicsofhydraulicfluidsaccordingtoASTMD2882/DIN51389.Inafirststep,amathematicaltheorybasedonthedescriptionofabrasiveandadhesivewearphenomenabytheshearenergyhypothesis,andincludingstochasticmodellingofthecontactingroughsurfaces,isadaptedtothetribologicalrealityofthevanepump,extendedbyaspectsofpartialelastohydrodynamiclubricationandverifiedbycorrespondingexperiments.PartAofthisstudyisdevotedtothemathematicalmodellingofthewearbehaviourofthevanepumpandtotheverificationoftheresultingalgorithmexperimentalwearinvestigationsrepresentthefocalpointofPartB,andthesearecomparedwiththeresultsofthecomputationalmethodderivedinPartA.2.AnalysisofthetribocontactTheVickersvanepumpV104Cisconstructedasapumpforconstantvolumeflowperrevolution.Thesystempressureisledtothebottomsideofthe12vanesintherotorslotstosealthecellsformedbyeachpairofvanes,thering,therotorandthebushingsinthetribologicallyinterestinglinecontactofthevaneandinnercurvatureoftheringFig.1.Simultaneously,allothervanesidesarestressedwithdifferentandperiodicallyalternatingpressuresofthefiuid.Acomprehensivestructureandstressanalysisbasedonquasistaticmodellingofallinertialforcesactingonthepump,andconsideringtheinnercurvatureofthering,theswivelmotionofthevanesinrelationtothetangentofcurvatureandtheloadingassumptions,isdescribedinRefs.13.Thereby,acharacteristicgraphforthecontactforceFeasafunctionoftheturnanglecanbeobtained,whichdependsonthegeometryofthevanesusedineachrunandthesystempressure.Fromthis,theinnercurvatureoftheringcanbedividedintofourzonesofdifferentloadingconditionsinvaneringtribocontactFig.2,whichisingoodagreementwiththewearmeasurementsontheringsintheareaofmaximumcontactforcezonen,thehighestlinearwearcouldbefound2,3seealsoPartB.3.Mathematicalmodelling3.1.BasicrelationsforwearcalculationThevaneandringshowcombinedabrasiveandadhesivewearphenomenaFig.3.ThebasicconceptsofthetheoryforthepredictivecalculationofsuchwearphenomenaaredescribedinRefs.46.Startingfromtheassumptionthatweariscausedbysheareffectsinthesurfaceregionsofcontactingbodiesinrelativemotion,thefundamentalequation1forthelinearwearintensityIhinthestationarywearstatecanbederived,whichcontainsthespecificshearenergydensityes/ro,interpretableasamaterialconstant,andtherealareaArsoftheasperitycontactsundergoingshear.Todeterminethisrealcontactarea,thedescriptionofthecontactingroughsurfacesastwodimensionalisotropicgaussianfieldsaccordingtoRef.7isincludedinthemodelling.Thustheimplicitfunctionalrelationwiththeweightfunction2isfound,whichcanbeusedtocalculatethesurfaceratioinEq.1forunlubricatedcontactsfromthehertzianpressurePaactingintheinvestigatedtribocontactbyacomplicatediterativeprocessdescribedinRefs.6,8.TheconcretestructureofthefunctionsFandcdependsontherelativemotionofthecontactingbodiessliding,rolling.Theparametera(m0m4)/m22representsthepropertiesoftheroughsurfacebyitsspectralmoments,whichcanbedeterminedstatisticallyfromsurfaceprofilometry,andtheplasticityindex妒mOm4y4E/Hisameasureoftheratioofelasticandplasticmicrocontacts.3.2.ExtensiontolubricatedcontactsThealgorithmresultingfromthebasicrelationsforwearcalculationwasappliedsuccessfullytounlubricatedtribosystems8.ThefirstconceptsforinvolvinglubricationinthemathematicalmodelaredevelopedinRef.8.TheyarebasedontheapplicationoftheclassicaltheoryofelastohydrodynamiclubricationEHLtothemicrocontactsoftheasperities,neglectingthefactthatthereisalsoamacrolubricationfilmwhichseparatesthecontactingbodiesandisinterruptedinthecaseofpartiallubricationbytheasperitymicrocontacts.Thereforetheiruseforcalculatingpracticalwearproblemsleadstounsatisfactoryresults9.Theyareextendedherebyincludingthefollowingassumptionsinthemathematicalmodel.1Lubricationcausestheseparationofcontactingbodiesbyamacrofilmwithameanthicknessu.whichcanbeexpressedintermsofthesurfaceroughnessby10

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