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1、本科生毕业设计（论文）外文翻译毕业设计（论文）题目：几种典型的制动器的对比分析与设计外文题目：Adiscbraketeststandformeasurementofairbornewearparticles译文题目：盘式制动器试验台上测量空气中磨损颗粒学生姓名：专业：车辆工程指导教师姓名：评阅日期：AdiscbraketeststandformeasurementofairbornewearparticlesABSTRACTDuringbraking,thereiswearonboththerotorandthepads.Thispro
2、cessgeneratesparticlesthatmaybecomeairborne.Infieldtests,itisdifficulttodistinguishtheseparticlesfromothersinthesurroundingenvironment.Therefore,alaboratoryteststandhasbeendesignedwhichallowscontrolofthecleanlinessofthesurroundingair.Theteststandconsistsofafrontrightbrak
3、eassemblymountedinasealedchamber.Abrakingloadisappliedbyapneumaticsystemandtherotor,whichhasbeenpre-conditionedwitharustlayertosimulateacarstandingparkedovernightinawetenvironment,isdrivenbyanelectricmotor.Thenumberandsizeofairbornewearparticlesarethenmeasured.Thisexperi
4、mentalset-uphasbeenverifiedbyaninitialtestseriesperformedatlowbrakingloads.Theresultssuggestthatthisteststandcanbeusedtostudyrustlayerremovalfromtherotor.keywords:wear;airborneparticles;discbrake;teststand;rustlayerINTRODUCTIONManystudieshaveshownanassociationbetweenadve
5、rsehealtheffectsandtheconcentrationofairborneparticlesintheatmosphere.1–3Inurbanenvironments,airborneparticlescancomefromdifferentsources,e.g.demolitionandconstruction,4resuspendedroaddust,5wheel-to-railcontact,6,7car-to-roadcontact8,9anddiscbrakes.10,11Duringbraking,bot
6、hthebrakepadsandrotorsareworn,generatingwearparticles.Someoftheseparticlesaredepositedonthebrakehardware,andothersbecomeairborne.Furthermore,toensurerobustbrakeperformance,somebrakesystemsmayrequirethepadstofrequentlybeinlowpressurecontactwiththerotor.Thisdraggingmayremo
7、veanyrustlayer,whichmaybuildstandingparkedovernightinawetenvironment,fromtherotorandkeepthecontactsurfacesclean.However,theresultingdragtorqueincreasesthefuelconsumptionandgenerateswearparticles,becausethepadsarestillincontactwiththerotoraftertherustlayerhasbeenremoved.I
8、tisthereforedesirabletoreducethedraggingwithoutaffectingtheperformanceofthebrakes.Whenmeasuringairborne
