轴承寿命分析外文翻译

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1、犹方民族丈醪早坐殺针外夂輸锌翻锌軀目/轴承失数今斩般名向琏标曇号20091210专地过程装备与控制工程指导教师犹方民族？;醪教务处制BEARINGLIFEANALYSISABSTRACTNatureworkshardtodestroybearings,buttheirchancesofsurvivalcanbeimprovedbyfollowingafewsimpleguidelines.Extremeneglectinabearingleadstooverheatingandpossiblyseizureor

2、,atworst,anexplosion.Butevenafailedbearingleavescluesastowhatwentwrong•Afteralittledetectivework,actioncanbetakentoavoidarepeatperformance.KEYWORDS:bearings,failures,life1・WHYBEARINGSFAILAnindividualbearingmayfailforseveralreasons;however,theresultsofanendur

3、ancetestseriesareonlymeaningfulwhenthetestbearingsfailbyfatigue-relatedmechanisms.Theexperimentermustcontrolthetestprocesstoensurethatthisoccurs.Thefollowingparagraphsdealwithafewspecificfailuretypesthatcanaffecttheconductofalifetestsequence.theinfluenceoflu

4、bricationoncontactfatiguelifeisdiscussedfromthestandpointofEHLfilmgeneration.Therearealsootherlubrication-relatedeffectsthatcanaffecttheoutcomeofthetestseries.Thefirstisparticulatecontaminantsinthelubricant.Dependingonbearingsize,operatingspeed,andlubricantr

5、heology,theoverallthicknessofthelubricantfilmdevelopedattherollingelement-racewaycontactsmayfallbetween0.05and0.5“m•Solidparticlesanddamagetheracewayandrollingelementsurfaces,leadingtosubstantiallyshortenedendurances.Therefore,filtrationofthelubricanttothede

6、siredlevelisnecessarytoensuremeaningfultestresultThedesiredlevelisdeterminedbytheapplicationwhichthetestingpurportstoapproximate.Ifthisdegreeoffiltrationisnotprovided,effectsofcontaminationmustbeconsideredwhenevaluatingtestresults-Themoisturecontentinthelubr

7、icantisanotherimportantconsideration.Ithaslongbeenapparentthatquantitiesoffreewaterintheoilcausecorrosionoftherollingcontactsurfacesandthushaveadetrimentaleffectonbearinglife・However,thatwaterlevelsaslowas50-100partspermillion(ppm)mayalsohaveadetrimentaleffe

8、ct,evenwithnoevidenceofcorrosion.Thisisduetohydrogenembrittlementoftherollingelementandracewaymaterial・Amaximumof40ppmisconsiderednecessarytominimizelifereductioneffects.Thechemicalcompositionof