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ID:47417454
大小:60.00 KB
页数:9页
时间:2019-06-14
《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)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
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