毕业论文外文翻译--轴承失效分析(适用于毕业论文外文翻译+中英文对照).doc

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1、北方民族大学毕业设计外文翻译翻译题目：轴承失效分析姓名学号20091210专业过程装备与控制工程指导教师北方民族大学教务处制BEARINGLIFEANALYSISABSTRACTNatureworkshardtodestroybearings,buttheirchancesofsurvivalcanbeimprovedbyfollowingafewsimpleguidelines.Extremeneglectinabearingleadstooverheatingandpossiblyseizureor,atworst,anexplosion.Butevenafailedbearingle

2、avescluesastowhatwentwrong.Afteralittledetectivework,actioncanbetakentoavoidarepeatperformance.KEYWORDS:bearings,failures,life1.WHYBEARINGSFAILAnindividualbearingmayfailforseveralreasons;however,theresultsofanendurancetestseriesareonlymeaningfulwhenthetestbearingsfailbyfatigue-relatedmechanisms.Th

3、eexperimentermustcontrolthetestprocesstoensurethatthisoccurs.Thefollowingparagraphsdealwithafewspecificfailuretypesthatcanaffecttheconductofalifetestsequence.theinfluenceoflubricationoncontactfatiguelifeisdiscussedfromthestandpointofEHLfilmgeneration.Therearealsootherlubrication-relatedeffectsthat

4、canaffecttheoutcomeofthetestseries.Thefirstisparticulatecontaminantsinthelubricant.Dependingonbearingsize,operatingspeed,andlubricantrheology,theoverallthicknessofthelubricantfilmdevelopedattherollingelement-racewaycontactsmayfallbetween0.05and0.5m.Solidparticlesanddamagetheracewayandrollingelemen

5、tsurfaces,leadingtosubstantiallyshortenedendurances.Therefore,filtrationofthelubricanttothedesiredlevelisnecessarytoensuremeaningfultestresult.Thedesiredlevelisdeterminedbytheapplicationwhichthetestingpurportstoapproximate.Ifthisdegreeoffiltrationisnotprovided,effectsofcontaminationmustbeconsidere

6、dwhenevaluatingtestresults.Themoisturecontentinthelubricantisanotherimportantconsideration.Ithaslongbeenapparentthatquantitiesoffreewaterintheoilcausecorrosionoftherollingcontactsurfacesandthushaveadetrimentaleffectonbearinglife.However,thatwaterlevelsaslowas50-100partspermillion(ppm)mayalsohavead

7、etrimentaleffect,evenwithnoevidenceofcorrosion.Thisisduetohydrogenembrittlementoftherollingelementandracewaymaterial.Amaximumof40ppmisconsiderednecessarytominimizelifereductioneffects.Thechemicalcompositionofthet