外文翻譯畢業(yè)設(shè)計(jì)題目：液體動(dòng)壓滑動(dòng)軸承試驗(yàn)臺(tái)原文1：Researchonthereliabilityofslidingbearingsupportinaswash-platetypeaxialpistonwaterhydraulicpump譯文1：研究的可靠性,滑動(dòng)軸承支撐斜盤式軸向柱塞泵型水液壓原文2：Applicationofcomputationalfluiddynamictomodelthehydraulicperformanceofsubsurfaceflowwetlands譯文2：應(yīng)用計(jì)算流體動(dòng)力學(xué)模型來模擬地下水流水力性能的濕地Researchonthereliabilityofslidingbearingsupportinaswash-platetypeaxialpistonwaterhydraulicpumpYinF.L.,NieS.L.CollegeofMechanicalEngineeringandAppliedElectronicsTechnologyRuanJ.Logisticsdepartmentofthe92962tharmyPeoplesLiberationArmyofChinaBeijingUniversityofTechnologyBeijing100124,CRuanJ.Logisticsdepartmentofthe92962tharmyPeoplesLiberationArmyofChinaBeijingUniversityofTechnologyBeijing100124,CGuangzhou510700,CAbstractInthispaper,twokindsofdifferentslidingbearingsupportstructureincludingatraditionalcross-shaftandasemi-shaftaredesignedforawaterhydraulicpump.Thecharacteristicsofthetwoslidingbearingsineachstructurearecalculated.Bycomparison,itisfoundthattheworkingconditionsofthetwoslidingbearings,especiallythepvvalue,inthesemi-shaftsupportstructureareneartobeidenticalinthecross-shaftone,whichwillbehelpfultoprolongtheirservicelife.BasedontheStress-strengthinterferencetheory,areliabilitycalculationmodelofthefrictionpairbetweentheshaftandslidingbearingsisproposed.Theanalysisresultsindicatethatthesemi-shaftslidingbearingsupportisbeneficialtolargelyraisetheinherentreliabilityofthewaterhydraulicpumpaswellastheservicelifeofthepump.Keywordswaterhydraulicpump；slidingbearing；pvvalue；Reliability.IntroductionWaterhydraulicsystemisoperatedwithrawwater(puretapwater)substitutingformineraloil.Suchsystemsarebecomingmoreandmorepopular,especiallyinthefieldsofsteelandglassproduction,nuclearpowergeneration,coalandgoldmining,foodandmedicineprocessing,oceanexploration,andunderwaterrobotics.Comparedwithconventionalmineraloil,rawwaterthatactsashydraulicfluidhasseveralinherentadvantages,includinglowoperatingcost,soundenvironmentalcompatibility,non-flammability,andlowpollutionpotentialtoproducts1-2.Waterhydraulicaxialpistonpump(WHAP)isoneofkeypowercomponentsinwaterhydraulicsystems.Thereareseveralchallengingissuesassociatedwiththepump,suchasconflictsbetweenlubricationandwear,andbetweensealingandleakage.Especially,shaftandbearingsformkeyfrictionpairs,whichwillresultinsignificantinfluencesonthepumpsperformance.Generally,thehydrodynamicslidingbearingisextensivelyusedforsupportingthewaterhydraulicpumpsshaft.Therefore,inordertoimprovethepumpsefficiencyandreliability,itiscrucialtostudytheforcedistributionofslidingbearingsthoroughly.Accordingtohydrodynamiclubricationtheory,thecriticalpoints,whichsatisfiesthewearresistanceforslidingbearingandshaftofWHAPincludes:(1)Anoptimalloaddistributedstrategyshouldbeusedtodetermineoptimaldimensionsforachievingtheevendistributingoftheload.(2)Severalsuitablematerialsshouldbeselectedtomeetthewaterlubricationworkingconditionsandtoensurealonglifewithlowerfrictionlosses3.Theconceptsofbothstressandstrengthrelatingtoreliabilitydesignaregeneralized.Inthispaper,thereliabilityofslidingbearingsupportwillbeinvestigatedusingStress-strengthinterferencemodeltocalculatethereliabilityvalueoftheslidingbearings,whichwillincludetheeffectoftheflowfluctuationinWHAP.II.DescriptionofslidingbearingsupportFigure(a)showsaschematicofatypicalcross-shaftsupportingstructure.Thecylinderblockissupportedontheshaft.Twoslidingbearingsarelocatedonthecylindersleftandrightendstosupporttheshaft.Figure(b)showsaschematicofanoveldesign,whereasemi-shaftsupportingstructureisemployed.Thefrontslidingbearingisusedtosupporttheinputshaft(splineshaft).Andtherearslidingbearinginsidethecylinderisusedtosupportthecylinderblock.Inthesemi-shaftsupportstructure,thesplineshaftandcylinderareinterferencefit,andtheyarecombinedbyaspline.Duringpumprunning,themotordrivesinputshaftrotating,bringingalongtherotationofthecylinder.Becauseofthepresenceoftheangleofswashplate,thewhirlingmotionofthecylinderistranslatedintostraightreciprocatingmotionofthepistons.Whenthecylinderrotatedaperiod,thepistonsreciprocatearound-triptocompleteaprocessofsuctionanddischargeofthepump.(a)cross-shaftsupport(b)semi-shaftsupportFig.1