会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

外文翻译--发动机零件泄漏检测技术及应用.doc外文翻译--发动机零件泄漏检测技术及应用.doc -- 5 元

宽屏显示 收藏 分享

资源预览需要最新版本的Flash Player支持。
您尚未安装或版本过低,建议您

英文原文EnginepartsleakdetectiontechnologyandapplicationFirst,anoverviewofthevoiceLeakdetectiontechniques,sometimesreferredtoasthetesttechnologyorsealingleakagedetectiontechnology.Inrecentyearshasbeenwidelyusedinautomobilemanufacturingindustry,suchasthecylinderblockwaterjacket,watersetofcylinderhead,crankshaftoilholes,etc.,inaddition,thereareclearancevolumemeasurementandengineassemblytesting,etc.Withtheapplicationanddevelopmentofleakdetectiontechnology,alsohasformedaprofessionalmanufacturers,moreprestigiousmanufacturerssuchasGermany,FrenchATEQJWFROEHLICHcompany,inc.,UnitedStatesoftheUSONcompany,COSMIntertechcorporation,inadditiontoJapan,TokyoMicroctrolvantypestrainscommune,Italy,etc.Leakingtestmachineismadeupofleakdetectioninstrument,mechanicalsealingclamp,updownmaterialmechanicalpartsandelectriccontrolsystemcompositionandsoon.SomemanufacturerssuchasGermany,aFloridacompany,notonlycanprovideallkindsofleakdetectionequipment,andcanprovidetryleakageorleakageautomaticline.Intheleakdetectiontechnology,thefirsttopointoutisleakingandnotleakisjustarelativeconcept,isnoleakageintheory,onlywhentheleakagequantitydoesnotexceedcertainlimits,wethinkthatisnotleak,orqualified.Second,fundamentalknowledgeofleakage1.1theflowofthefluidAleakiscontentbyalimitedspacetoruntotheexternalorothersubstancesbyspaceoutsideintotheinside.Contentscanbegas,liquidorsolid.Limitedspacecanmakeallkindsofexplanation,suchasenginecylinderbodywassealedchannelisalimitedspace.Leak,inshort,isakindoffluidflowphenomenon.Ingeneral,isfluidflowsthroughtheholesontheobjectorthe.Fluidflow,liketheflowoftheelectric,electronicmobilebecauseapotentialofhighandlow,aslongasthepotentialdifferencebetweentheconductors,therewillbeaflowofelectriccharge.Movementofmaterialmusthavemotivepower,theelectricpotentialdifferenceisthedrivingforce.Leakage,leakageamountdependsonthesizeoftheprimemover,availableundertypesaidQfdelta,whereQsaidleakage,deltasaidimpulsion,fisthefunction.Fisacomplexfunctionnormally,itisverydifficulttodeterminethesizeofthe,ifweseeitonlyasakindofextremelypureproportionalrelationship,andalsoonlytoapressuredifferencedelta,typeontheQCP1,P2,theproportionalityconstantCtype,P1,P2,saidthespacebothinsideandoutsidepressure,leakageoftheprimemoverislikecurrentelectromotiveforce,Cislikeconductance,socanbeCsaidasconduction.Aleakageisreferstothefluidthroughtheholesthroughthephenomenon,throughthequantityisrelatedtopressuredifferenceonbothsidesofthehole,alsowiththeeaseofflowthrough,namely,conduction.1.2fluidmotionAccordingtofluidmechanicstheory,theflowofthefluidaretwokindsofstate,thelaminarflowandturbulentflow.Whenlaminarviscousforceplaysaleadingrole,theparticleisgovernedbyviscousfluid,notvoluntarymovement,theinertialforceplaysaleadingrolewhenturbulentflow,fluidparticleinhighspeedmotionviscositynolongerbindit.Inthevacuumtechnology,canbedividedintolaminarviscousflowandmolecularflow.Accordingtothetheoryofgasmolecularmotion,forthroughthegascylinder,whenthegaswhenthemeanfreepathislargerthanthediameterofthecylinder,asmolecularflow.Ontheotherhand,themeanfreepathofgashours,thanthediameterofthecylinderisviscousflow.1.3thepipelineresistanceandconductionWiththeconductionofelectricityneedsaconductor,theconductoristhepipeline.Fortheleakitself,whetheritisasmallholeorcrack,canberegardedasakindofpipe.Inthetype,QCP1,P2,conductionCasthereciprocalofresistance.Therefore,canbecalculatedinthepipelinetransmissionpipelineresistance.Fluidflowisfarmorecomplicatedthantheelectricconduction,whencalculatingtheCvalue,shouldbeaccordingtothesize,shape,pressurepipe,fluidcharacteristics,suchasspecificconditionstocalculate.Ifacontainerunderacertainpressureleak,butitdoesnotleak.Couldget,fromwehavetalkedabouttheformulasofgasandliquidinthesamepipelinetransmissionisnotthesame.2.1leakageofformContainerleakphenomenon,suchaswaterleakageoftheenginecylinder,usuallyismainlyduetothelocaltissuelooseontheblankcastingquality,castingormachiningerrorcausetheholewallistoothinandprocesscausedbyunequalsealantpluggingplacedaubreason.Infact,forleakagetechnology,thereisnoneedforaccurateunderstandingoftheleakageofvariousforms,butitisalsoimpossible.Leakdetectionbelongstoakindofnondestructivetesting,metallographicanalysisofitisdifferentfromthematerial.Therefore,wecandoisdetermineleakage.Inordertobetterunderstandtheleakagephenomenon,itisnecessarytoknowsomesimilardiffusionandthroughthephenomenontoleakphenomenon.Thesephenomenainthegasflowthroughsolidthispoint,andtheleakageoftheresultisthesame.Diffusionphenomenonreferstobothsidesofthegasinavehiclewithadifferentialpressure,orpressuredifference.Gasfromhighpressureorhighpressuretolowinthedirectionoftheflowdirection.Thisphenomenonissimilartoleak.Whenthevehicleissolid,gasfrommediumflowsthroughtheholes,orspreadtothevehiclevehiclenoleakholeflowafterthepast.Inbothcasesisbelongtowhichkindof,sometimesitisdifficulttojudge.Throughreferstogasfromasolidpasseddissolvedthematerialfirst,increasingconcentration,finallyintheweehours.2.2theleakageTherearethreekindsofleakageofrepresentation1insize,suchasroundandstraightshape,innerdiameterandlengthishowmuchforeachpleaseindicateassaid.Actuallythissizemeasurementisverydifficulttodoit,evencantdo.So,thismethodisnotpractical.2usingleak,saidtothedifficultyofthetransmissionbox.Thiswayisnotsaidleakageshapeitself,butsaidthesizeofthegaspathway.3expressedingasflow.Thismethodhasbeenwidelyused,becauseitiseasytouseinstrumenttomeasuretheflowofgas,orgasflowmeasurementwithacollectionofbubblesmethod.3.1theclassificationoftestmethodToonedevicetoknowtheleaks,andwillknowhowmuchitsleakage,mustexertaprimemover,i.e.letthedeviceproducesapressuredifferencebetweeninsideandoutside,socanthedevicecompressionordecompressiontwoways.Inaddition,canalsobeclassifiedaccordingtotheleakdetectionprocess,onekindisplaced,anotherfordynamicmethod.Alsohaveaccordingtothedeterminationofobjectclassification,canbedividedintotheamountofgasorliquidquantitymeasurementandpressuremeasurementdirectlyorpartialpressuremeasurement.Intheabovedetectionmethod,pressuremethodisusedforthedetectionofcommonlyusedmethods.Pressuremethodisusedforthedetectionofcommonlyusedmethods.Placepressuremethodandpressuremethodandpressuredynamicmethod.Decompressionmethodiscommonlyreferredtoasvacuummethod,thismethodisnocompressionmethodusedwidely,butithashighdetectionaccuracy,andeasyintheworkpiecetobemeasuredhavetoseal.Vacuumprocess,likepressure,vacuumandvacuumdynamicplacement.Suchasvacuumdifferentialpressuremethod,liquidcoatingmethod,etc.Andmethodsusedinthevacuumconditionsthanthekindsofpressureundertheconditionofthekindsofdetectionmethods.3.2selectionofleaktestInnumerousdetectionmethods,eachmethodhasitsdifferentfeatures.Choicesshouldconsiderwhoissuitablefor,thosewhodontfit.AccordingtothedifferentfeaturesofvariousdetectionmethodstochoosefromthefollowingaspectsintoconsiderationPrinciple1irrespectiveoftheapproach,dontfullyunderstandtheprincipleofthemethod,willnotgetgoodresult.2thesensitivitytheminimumleakagecanbemeasuredshouldconsiderwhichmethodisusedtomeasureoftheleveltowhichtheleakage.3detectiontimeirrespectiveofthedetectionmethod,ittakesacertaintime.Forplacementtesting,fromRichardwillextendtheplacedtimewillimprovethesensitivityandthedetectionofanartifactoftheleakagetakesalongtime,obviouslycannotbeusedforonlinedetectionofengineparts.4testenvironmentofvarioustestmethodsisdifferenttotherequirementoftestenvironment.Ifadoptthemethodofmeasuringpressurevalue,itisfollowtheidealgasequationofstate,sothetemperature,humidityandotherfactorsonthemeasuringresultsislarger,theinfluenceofthechoiceismustbetakenintoaccount.5leakagepositionjudgmentinallkindsofdetectionmethods,somecanonlygivetotheleakage,leakagecandeterminewhetherartifacts,butitcantleak,somecanreflecttheworkpieceisleaking,anddetermineleak,butthespecificleakageitisdifficulttoget,andcangiveleakage,candeterminethespecificleakagain.Ifwanttorepairtheleakageoftheworkpiece,theleakofthejudgmentisnecessary.6reliabilityleakdetectionbelongstoameasuringtechnique,themeasurementmustbecredibleandreliable.Allkindsofmethodisusuallyaccompaniedbyhumaneyedetection,duetothefactorsthat,itsconsistencyispoor,butisstableandreliable.Andvariousinstrumentmethod,althoughbetterconsistency,butitsstabilityandreliabilityoftheinstrument,andmanyotherfactorsinfluence.Alllandownerseconomydetectionefficiencywhenchoosingmethodofmeasurementisalsoafactortoconsider.Theaboveitemsisourstartingpointofhowtochoosewhatkindoftestmethod.Inspecificchoices,theyshouldbeandotherfactors,suchastests,theinfluenceofworkpiecetosealtheeaseofcombinationofconsideration,andchoosethebestmethodforleakdetection.4severalmajorleakdetectorandthedetectionmethodIntheleakdetectiontechnology,atpresentthemainleakagedetectorandthedetectionmethodhasaabsolutepressuretypeleakagedetectorbdifferentialpressuretypeleakagedetectorcmassflowleakdetector4.1theabsolutepressuretypeleakdetectorandthedetectionmethodCommonlyusedisthestepdownmethod,alsocanuseboosterandthevacuumismeasured.Thetestprocedurecanberoughlydividedintopreinflatable,inflatable,voltageregulator,measurementexhaustfivestages1openthevalve,airinflatedtothepressureP,fillingstageandcanbebrokendownintopreaerationandaerationsteportwo.Stablestage1valveclosed,thisphaseistoprovidethestablegasandheatexchangeoftime,itisnecessaryforprecisemeasurement,thestablephaseovertheinstantaneouspressurevalueasareferencepressurestorage.Phasesmeasurementsystemformeasuring.Tomonitorthefinalpressure,andcomparingwithreferencevalue,measuretheΔPvalues,ΔPvaluesinexcessoftheprescribedthresholdforunqualified,leakratecanbeobtainedbyΔPvalueVExhaustphasetheartifactsinthegasfromtheatmosphere,usuallyadoptslooseblockingartifactstoexhaust.4.2thedifferentialpressuretypeleakdetectorandthedetectionmethodIntheabsolutepressuretypetestinginstrument,sensitiveelementUSESthepressuresensor,differentialpressuretypeleakagedetectorisusedinthedifferentialpressuresensor.Differentialpressuretypeofleakdetectormeasurementprocessbasicallyisdividedintofivestages.Thedifferenceisinflatablestage1,2valveareopened.Bygasphaseintothestablebalance,1offvalve,thevalveopen2,sothebalanceattheendofthestage,backpressurechamberHandLpressureequaltothepressureroom,ΔP0.Whenenteredthemeasurementphase,valveshutoff.IfleaksartifactshaveLcavitypressureisreduced,producingpressuredifferentialΔP,inthesameway,andcanbedeterminedfromΔPVleakrate.AbsolutepressureanddifferentialpressuretypeleakdetectordetectorismeasuredbyusingthepressurevaluetoindirectlymeasurethechangeoftheleakrateofV.4.3themassflowtypeleakdetectorandthedetectionmethodMassflowtypeleakdetectorisdirectlymeasuredworkpieceleakflowinstrument,thesensitiveelementistheflowsensorusuallyusingthemodulecomponent.Inflowsensorwithaconstanttemperatureheatingsystem,whentheairflowflowchange,takeawaytheheatchangemaketemperaturet,sothatthetemperatureoftheclosedloopsystemheatingcurrentorvoltagechanges,whichcanmeasuretheflowchanges,duetothezeromethodisusedtomeasure,soitcanobtainhigherprecision.Thiskindofflowsensorcandetectverysmallflownotonly,alsocanmeasurethelargerflowleakagerate,butalsocanmeasurethedirectionofairflow.Duetoflowwasmeasuredunderconstanttemperature,sothemeasuredmassflowrateis,therelativelysmalleffectonthetemperature,canbeusedforleakdetectionoflargeflow,largevolume.Inordertoimprovetheaccuracyofmeasurement,themassflowtypetesting,alsooftenusestandardartifactsandgascircuitcomposedofworkpiecetobemeasured.Whentheworkpiecetobetestedforleaks,thepressureisreduced,whilethestandardartifactsthepressureinsidethecontainerremainsconstant.Sensorspickupbetweenthetwoartifacts,compressedairpressureisPfromthestandardworkpiecetobemeasuredbysensorartifacts.Despitetheabovethreekindsofmeasurementmethodscanmeettherequirementsofthevastmajorityofleakdetection,butfrompracticesituationandpricelevel,firstrecommendedtheuseofleakdetectorisabsolutepressuretype,becauseitissimple,reliable,doesnotneedtobalancethereferenceartifacts.Undertheconditionofthehighaccuracyrequirement,itisrecommendedtousedifferentialpressuretypeleakdetector.Underthebigleakageflow,isrecommendedtousemassflowtypeleakdetector,suchasleakdetectionofinletandexhaustvalveseat.5engineparts,leakagetryleakageprocessanalysisandcommonlyusedmethod
编号:201311171552367002    大小:112.50KB    格式:DOC    上传时间:2013-11-17
  【编辑】
5
关 键 词:
教育专区 外文翻译 精品文档 外文翻译
温馨提示:
1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
  人人文库网所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
0条评论

还可以输入200字符

暂无评论,赶快抢占沙发吧。

当前资源信息

4.0
 
(2人评价)
浏览:28次
英文资料库上传于2013-11-17

官方联系方式

客服手机:13961746681   
2:不支持迅雷下载,请使用浏览器下载   
3:不支持QQ浏览器下载,请用其他浏览器   
4:下载后的文档和图纸-无水印   
5:文档经过压缩,下载后原文更清晰   

相关资源

相关资源

相关搜索

教育专区   外文翻译   精品文档   外文翻译  
关于我们 - 网站声明 - 网站地图 - 友情链接 - 网站客服客服 - 联系我们
copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5