机械专业毕业论文外文翻译

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1、附录一英文科技文献翻译英文原文：ExperimentalinvestigationoflasersurfacetexturedparallelthrustbearingsPerformanceenhancementsbylasersurfacetexturing(LST)ofparallel-thrustbearingsisexperimentallyinvestigated.Testresultsarecomparedwithatheoreticalmodelandgoodcorrelationisfoundovertherelevantoperat

2、ingconditions.Acompari-sonoftheperformanceofunidirectionalandbi-directionalpartial-LSTbearingswiththatofabaseline,untexturedbearingispresentedshowingthebenefitsofLSTintermsofincreasedclearanceandreducedfriction.KEYWORDS:fluidfilmbearings,sliderbearings,surfacetexturing1.Introductio

3、nTheclassicaltheoryofhydrodynamiclubricationyieldslinear(Couette)velocitydistributionwithzeropressuregradientsbetweensmoothparallelsurfacesundersteady-statesliding.Thisresultsinanunstablehydrodynamicfilmthatwouldcollapseunderanyexternalforceactingnormaltothesurfaces.However,exper

4、ienceshowsthatstablelubricatingfilmscandevelopbetweenparallelslidingsurfaces,generallybecauseofsomemechanismthatrelaxesoneormoreoftheassumptionsoftheclassicaltheory.Astablefluidfilmwithsufficientload-carryingcapacityinparallelslidingsurfacescanbeobtained,forexample,withmacroormicrosu

5、rfacestructureofdifferenttypes.Theseincludewaviness[1]andprotrudingmicroasperities[2–4].AgoodliteraturereviewonthesubjectcanbefoundinRef.[5].Morerecently,lasersurfacetexturing(LST)[6–8],aswellasinletrougheningbylongitudinalortransversegrooves[9]weresuggestedtoprovideloadcapacityi

6、nparallelsliding.TheinletroughnessconceptofTonder[9]isbasedon‘‘effectiveclearance’’reductionintheslidingdirectionandinthisrespectitisidenticaltothepar-tial-LSTconceptdescribedinref.[10]forgeneratinghydrostaticeffectinhigh-pressuremechanicalseals.VeryrecentlyWangetal.[11]demonstrat

7、edexperimentallyadoublingoftheload-carryingcapacityforthesurface-texturedesignbyreactiveionetchingofSiCparallel-thrustbearingsslidinginwater.Thesesimpleparallelthrustbearingsareusuallyfoundinseal-lesspumpswherethepumpedfluidisusedasthelubricantforthebearings.Duetotheparallelslidi

8、ngtheirperformanceispoorerthanmoresophisticated