軸承壽命分析外文翻譯

1、北方民族大學(xué)畢業(yè)設(shè)計外文翻譯翻譯題目：軸承失效分析姓名向延標(biāo)學(xué)號20091210專業(yè)過程裝備與控制工程指導(dǎo)教師沙衛(wèi)群北方民族大學(xué)教務(wù)處制1BEARINGLIFEANALYSISABSTRACTNaturewkshardtodestroybearingsbuttheirchancesofsurvivalcanbeimprovedbyfollowingafewsimpleguidelines.Extremeneglectinabearing

2、leadstooverheatingpossiblyseizureatwstanexplosion.Butevenafailedbearingleavescluesastowhatwentwrong.Afteralittledetectivewkactioncanbetakentoavoidarepeatperfmance.KEYWDS:bearingsfailureslife1.WHYBEARINGSFAILAnindividualb

3、earingmayfailfseveralreasonshowevertheresultsofanendurancetestseriesareonlymeaningfulwhenthetestbearingsfailbyfatiguerelatedmechanisms.Theexperimentermustcontrolthetestprocesstoensurethatthisoccurs.Thefollowingparagraphs

4、dealwithafewspecificfailuretypesthatcanaffecttheconductofalifetestsequence.theinfluenceoflubricationoncontactfatiguelifeisdiscussedfromthestpointofEHLfilmgeneration.Therearealsootherlubricationrelatedeffectsthatcanaffect

5、theoutcomeofthetestseries.Thefirstisparticulatecontaminantsinthelubricant.Dependingonbearingsizeoperatingspeedlubricantrheologytheoverallthicknessofthelubricantfilmdevelopedattherollingelementracewaycontactsmayfallbetwee

6、n0.050.5m.Solidparticlesdamage?theracewayrollingelementsurfacesleadingtosubstantiallyshtenedendurances.Therefefiltrationofthelubricanttothedesiredlevelisnecessarytoensuremeaningfultestresult.Thedesiredlevelisdeterminedby

7、theapplicationwhichthetestingpurptstoapproximate.Ifthisdegreeoffiltrationisnotprovidedeffectsofcontaminationmustbeconsideredwhenevaluatingtestresults.Themoisturecontentinthelubricantisanotherimptantconsideration.Ithaslon

8、gbeenapparentthatquantitiesoffreewaterintheoilcausecrosionoftherollingcontactsurfacesthushaveadetrimentaleffectonbearinglife.Howeverthatwaterlevelsaslowas50100partspermillion(ppm)mayalsohaveadetrimentaleffectevenwithnoev

9、idenceofcrosion.Thisisduetohydrogenembrittlementoftherollingelementracewaymaterial.Amaximumof40ppmisconsiderednecessarytominimizelifereductioneffects.Thechemicalcompositionofthetestlubricantalsorequiresconsideration.Most

10、commerciallubricantscontainanumberofproprietaryadditivesdevelopedfspecificpurposesfexampletoprovideantiwearpropertiestoachieveextremepressurethermalstabilitytoprovideboundarylubricationincaseofmarginallubricantfilms.Thes

11、eadditivescanalsoaffecttheenduranceofrollingbearingseitherimmediatelyafterexperiencingtimerelateddegradation.Caremustbetakentoensurethattheadditivesincludedinthetestlubricantwillnotsufferexcessivedeteriationasaresultofac

12、celeratedlifetestconditions.Alsofconsistencyofresultscomparinglifetestgroupsitisgoodpracticetoutilizeonestardtestlubricantfromaparticularproducerftheconductofallgenerallifetests.Thestatisticalnatureofrollingcontactfatigu

13、erequiresmanytestsamplestoobtainareasonableestimateoflife.Abearinglifetestsequencethusneedsalongtime.Amajjoboftheexperimentalististoensuretheconsistencyoftheappliedtestconditionsthroughouttheentiretestperiod.Thisprocessi

14、snotsimplebecausesubtlechangescanoccurduringthetestperiod.Suchchangesmightbeoverlookeduntiltheireffectsbecomemaj.Atthattimeitisoftentoolatetosalvagethecollecteddatathetestmustberedoneunderbettercontrols.Fexamplethestabil

15、ityoftheadditivepackagesinatestlubricantcanbeasourceofchangingtestconditions.Somelubricantshavebeenknowntosufferadditivedepletionafteranextendedperiodofoperation.ThedegradationoftheadditivepackagecanaltertheEHLconditions