已阅读5页,还剩14页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
英文原文wear181-183(1995)868-875CaseStudyTheoreticalandpracticalaspectsofthewearofvanepumpsPartB.AnalysisofwearbehaviourintheVickersvanepumptestA.Kunza,R.Gellrichb,G.Beckmannc,E.BroszeitaaInstituteofMaterialScience,TechnicalUniversityDarmstadt,P.O.Box111452,64229Darmstadt,GcmbUniversityforTechnol08y,EconomyandSocialScienceZittau/Goditz,FacukyofMaihematics,P.O.Box264,02763ZutaucPetersiliensrr.2d,03044Cottbus,Received16August1994;acceptedlNovember1994AbstractThewearbehaviourofthevanepumpusedinthestandardmethodforindicatingthewearcharacteristicsofhydraulicfluids(ASTMD2882/DIN51389)hasbeenexaminedbycomparisonofthecalculatedwearandexperimentaldatausingalubricantwithoutanyadditives.InadditiontothetestseriesaccordingtoDIN51389,temperatureprofilesfromthepumphavebeenanalysedusingthebulktemperaturesofthecontactingcomponentsandthetemperatureinthelubricationgapasinputdataforthewearcalculation.CartridgesusedintestsaccordingtotheGennanstandardhavebeenexaminedextensivelybeforeandaftereachruntoobtaininputdataforthemathematicalmodelandtoJocatewear.Ananalysisofthe:tluidpropertiesandaninvestigationoftheinnuenceofwearparticlesinthehydrauliccircuitwereperformed.Theexperimentalresultswerecomparedwiththewearprediction,whichwasverifiedbytheagreementintermsofload,temporalwearprogressandlocalwear.Conclusionshavebeendrawnwithregardtothevalidityoftheloadassumptionsandwearcalculation,aswellastothelimitsofapplicabilityofthismethodinthepresenceofadditives.Keywords:Vanepumps;Hydraulicfluids;Wearprediction;Vickersvanepumptest1.IntroductionEffortstodevelopamathematicaltoolforwearpredictionwillnotbesuccessfulwithoutconsideringwearanditsphenomena.ThetaskofPartBofthisstudyistodescribetheanalysisofthewearbehaviourinthetribosysteminvestigatedandhowtheknowledgeachievedinfluencesthecalculations.Inputdataarederivedfromthemeasurementofmechanicalandgeometricalquantities,suchasthehardness,stylusprofilometry,fluidpropertiesandcontactradii.Thermalquantitiesarealsoessentialforthemodellingoflubrication.Thecalculationsmustbeverifiedwithweardata.BecausethetribosystemtobeanalysedisthevanepumpemployedintheVickersvanepumptest,whichhasbeeninuseforabout40years,severalweardatacanbeusedforcomparisonbetweencalculatedandmeasuredwearresults.Thesearethewearmasses0043-1648/95/$09.501995ElsevierScienceS.A.AllrightsreservedSSDI0043-1648(94)07087-3aftereachtcstrun,theprogrcssionofwearovertimeandthelocalwearontheinnerringsurface;incombination,theseenableacomprehensivestatementtobemadeonthevalidityofthemathematicalmodeldescribedinPartA.2.ExperimentsAlIVickersvanepumptestsdescribedwererunwiththesamefiuid.ItisareferenceoiloftheGermanRcscarchAssociationforTransmissionTechnique(FVA),andisamineraloilwithoutanyadditives(FVA3).Thusthedisturbinginfluencesofadditivescanbeexcluded.2./.InputdataforcalculationFig.1liststheinputandoutputquantitiesofthecalculations.MostoftheinputparameterswerederivedsurfaceprofilescontactforceandcontactvelocitydynamicviscositycontactradiihardnessvaluesYoungsmoduli,Poissonnumbersandlubricationgapspecificshearenergydensities*pressureexponentc,fviscosity;tlubricationgaptemperatureRoughsurfuceshaarenergyhypotelastoliubictionWm=f(t)Wf=f()Fig.1.InputparametersandoutputquantitiesofthemathematicalmodelofPartA.Fig.2.CartridgeV104C:bushing,rotor,ring,bushing(abcwe),singlevane,pin(below).experimentallyfromallthecomponentsinvolvedbeforeandafteruseinthevanepumptests.Themechanicalcomponents,whichmustberenewedforeachtestrun,areshowninFig.2.Suchacartridgekitconsistsofarotor,ring,12vanes,bushingsandpin.Stylusprofilometrywasperformedontheinnersurfaceoftheringandonthetipsoftwovanesofthecartridgebeforeandaftereachtestrun.Earlierinvestigationshaveshownthattenparallelsectionsintheslidingdirectiononeachbodyaresufficienttodescribethesurfacetopographyinastatisticallysatisfactorymannerasatwo-dimensionalisotropicgaussianfieldaccordingtoRef.1.Onlythehighpassfilteredcomponentsoftheprofile(samplinglength,1.5mm;cuto五0.25mm)wereusedtodeterminethespectralmomentsmo,m2,m4andtheparameterofroughnessa.Accordingtothepartitionofthecontactforceintodifferentloadingzones,thetopographicdataofthenewsurfaceswereusedforzoneIV(lowlevelload,seePartA).Fortheotherzoneswithhighercontactforces,theprofilesofthesurfacesinthefinalconditionwereused,whichcorrespondstotheappearanceoftheinnerringsurfaceafterthetestruns.Thecontactforceandcontactvelocitywerecalculatedwithdifferentfluidpressuresanddynamicforcesactingonthevanes,revolutionnumberandringradu,whereasthechangeincontactradiuswasdocumentedwithaprofileprojector.Becausetheringradiiaremuchlargerthar)theradiiofthevanesinthecontactzone,thevanescanbeassumedtobehertziancylindersslidingalongaplanesurfaceandthecontactradiiaresimplytheradiiofthevanetips.Eachvanetipwastwicedrawnupatmagnificationsof100:1andthecontactradiiandcontactlocationsweremeasuredwithastenciLMeanvaluesofthecontactradiiweretransferredtothecalculation,whichisbased(similartothesurfaceprofiles)onvanesinbothconditions.TheVickershardnessHVlOwasmeasuredontheringandthreevanesofeachcartridge.Thishardnessleadstoabetterreproducibilitythanmicrohardnessvalues,butduetothelargeindenterload,itcouldonlybetakenafterthetestruns.Thereforechangesinhardnessvaluescouldnotberegistered.TheYoungsmoduli,Poissonnumbersanddensitiesofthering(AISI52100)andvanematerials(M2regC)arethefirstinputparametersintheshearenergyhypothesisandwereobtainedfromtheliterature.Thespecificshearenergydensities(seePartA)arematerialspecificconstants2l.Thefluidproperties(Fig.1)weremeasured,derivedfromtheliteratureorcalculated.Toobtainthedynamicviscosity,thedensitiesandkinematicviscositiesat20,40and800Cweremeasured.BecausethefluidisareferenceoilofFVA,thepressureexponentoftheviscosityisgiven3.Thetemperatureinthelubricationgapbetweentheringandvaneswasapprox:imatedbymeasurementsandcalculationsdescribedbelow.2.2.TemperatureprofilesTemperaturemeasurementwasperformedtoobtaininformationonhowaheatabletribometermustbecontrolledtosimulatethewearbehaviourofthevanepump.Thereforeshortenedtestrunswerecarriedoutuntiltemperatureswerestabilized.These10hvanepumptestsdeliveredtheinputdatafortheapproximationofthelubricationgaptemperatureinthering-vanecontact,aswellasadditionalwearmassestobecomparedwiththecalculatedprogressiortofwearintime.ThesamplingprinciplesforacquiringthetemperatureprofilesofthevanepumpareillustratedinFig.3.Thetemperatureofthelubricantinthegapbetweentheringandvaneswasestimatedtobeequaltoorgreaterthanthebulktemperatureontheinnerringsurface.Followingthefirstmainstatementofthermodynamics,theheatfluxQmpintothecomponentsofthepumpcanbederivedfromwiththefluidasthemediumforenergytransport.Qa,mpcanonlybetransferredtothecomponentsshowninFig.2.Forthesametemperaturedifferencesandmaterials,thisheatnUXcanbedividedintosinglecomponentfluxesaccordingtotherelationofmasses.ThederivedfluxQringistheheatwhichflowsinacertaintimeperiodinaradialdirectionthroughthering.Withtheknowntemperaturesontheouterringsurface,thebulktemperaturesontheinnerringsurfacecanbecalculatedandtransferredtothemodelofelastohydrodynamiclubrication.AlltestrunswiththeVickersvanepumpV104CwereperformedonatestrigaccordingtoASTMD2882/DIN51389,whichisshownschematicallyinFig.4.Thesestandardsdescribetheprocedurefortestingtheanti-wearpropertiesofhydraulicfiuids.TostarttheVickersvanepumptestaccordingtotheGermanstandard,thesystempressuremustberaisedinstepsof2MPaevery10min,beginningat2MPa,untilafinalpressureof14MPaisreached.Atthisstage,thefluidtemperaturemeasurcdbcforethepump(seeFig.4)mustbecontrolledtoguaranteeakinematicviscosityof13mm2S-iattheinletforevery:tluidtested.Theseconditionsmustbemaintaineduntilthetestisabortednormallyafter250hbyopeningthebypassofthepressurecontrolvalvebeforethemotorisstopped.Byacomparisonofthewearachievedontheringandvaneswiththeupperwearlimits,theanti-wearpropertiesofthefluidtestedcanbederived.ForperformingthetestssafelywiththefluidFVA3,itwaspreheatedt0400Candcirculatedinapressurefreeway.ThedamagewhichmayoccurduringthecriticalfirsthouroftherunscanbeavoidedusingTiNcoatedbushings4.Forcomparisonwiththeresultsderivedfromcomputation,thewearproducedintheserunsmustbedocumentedasamounts,bothlocallyandtemporally.Thewearmasseswerederivedfromtheweightdifferencesoftheringandvanesbeforeandaftereachrun.Theywereobtainedfromasequenceoffour250htestrunsandtw010hrunsfortemperaturemeasurement.Thelocallinearamountofwearwasdocum
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 输液休克的护理措施
- 北美洲简介介绍
- 儿童牙刷简介介绍
- 农村中小学体育开展现状
- 关于实行中小学校长负责制的调查与思考
- 软体家具行业分析
- 轮转泌尿外科出科小结
- 转移车行业分析
- 车祸患者的护理问题及护理措施
- 无线自由蓝牙产品优势介绍
- 2022年新疆中考历史试卷真题及答案详解
- 2021年地震演练脚本(指挥部定稿2修改)
- 国家是怎样炼成的
- 关于廉政警示教育片脚本【八篇】
- 《浅谈幼儿园家长教育选择现状研究》 论文
- 液压支架基本操作
- 【高中教学】高三英语教研组建设PPT
- 2023年海南美兰机场招聘笔试参考题库附带答案详解
- 2022年吉林省中考生物试卷解析版
- 高血压脑出血的血压调控
- 《氓》《孔雀东南飞》群文阅读课件【高效备课精研+知识精讲提升】 统编版高中语文选择性必修下册
评论
0/150
提交评论