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)

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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,anexp

2、losion.Butevenafailedbearingleavescluesastowhatwentwrong.Afteralittledetectivework,actioncanbetakentoavoidarepeatperformance.KEYWORDS:bearings,failures,life1.WHYBEARINGSFAILAnindividualbearingmayfailforseveralreasons;however,theresultsofanendurancetestseriesareonlymea

3、ningfulwhenthetestbearingsfailbyfatigue-relatedmechanisms.Theexperimentermustcontrolthetestprocesstoensurethatthisoccurs.Thefollowingparagraphsdealwithafewspecificfailuretypesthatcanaffecttheconductofalifetestsequence.theinfluenceoflubricationoncontactfatiguelifeisdis

4、cussedfromthestandpointofEHLfilmgeneration.Therearealsootherlubrication-relatedeffectsthatcanaffecttheoutcomeofthetestseries.Thefirstisparticulatecontaminantsinthelubricant.Dependingonbearingsize,operatingspeed,andlubricantrheology,theoverallthicknessofthelubricantfil

5、mdevelopedattherollingelement-racewaycontactsmayfallbetween0.05and0.5m.Solidparticlesanddamagetheracewayandrollingelementsurfaces,leadingtosubstantiallyshortenedendurances.Therefore,filtrationofthelubricanttothedesiredlevelisnecessarytoensuremeaningfultestresult.Thede

6、siredlevelisdeterminedbytheapplicationwhichthetestingpurportstoapproximate.Ifthisdegreeoffiltrationisnotprovided,effectsofcontaminationmustbeconsideredwhenevaluatingtestresults.Themoisturecontentinthelubricantisanotherimportantconsideration.Ithaslongbeenapparentthatqu

7、antitiesoffreewaterintheoilcausecorrosionoftherollingcontactsurfacesandthushaveadetrimentaleffectonbearinglife.However,thatwaterlevelsaslowas50-100partspermillion(ppm)mayalsohaveadetrimentaleffect,evenwithnoevidenceofcorrosion.Thisisduetohydrogenembrittlementoftheroll

8、ingelementandracewaymaterial.Amaximumof40ppmisconsiderednecessarytominimizelifereductioneffects.Thechemicalcompositionofthet