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1、.毕业设计中英文翻译0701054329机电工程学院吴轩昂学生姓名：学号：探测制导与控制技术学院：王利专业：指导教师：2011年6月...High–SpeedDataAcquisitionSystemBasedonARM&Linear-CCDDongJianjunZhaoXiaojinDept.Four,TheFirstAeronauticalTechnicalCollegeoftheAirForceXinyang464000.China.Abstract:Thispaperpresentsahighspeedacquisitionsystemoflinear-CCDbasedo
2、nARM,high-speedlinear-CCDandhigh-speedADCareselected.AsthesamplingspeedofA/DisslowerthantheworkingclockfrequencyofARM,CPLDandFIFOareusedasI/ObetweenA/DandARM.Itmakesthecircuitworksharmonious,simpleandeasycontrolling,andalsoincreasestheefficiencyofARM.Inordertoincreasethecommunicationspeed,the
3、UniversalSerialBus(USB)technologyisadoptedtocommunicatewiththePC.ARMisthekeyprocessorutilizedtocontrolthedatasampling,datacomputeanddatatransfer.Asaresult,thewholesystemworkseffective.Thesystemcanbeappliedtothehighspeeddataacquisitionandoperationsituationsfrommulti-channelanalogsignals.KeyWor
4、ds:ARM;LinearCCD;Contact-line;Pantograph;Stagger–valueI.IntroductionInelectrificationrailways,inordertoextendthelifeofthepantographonelectriclocomotives,sothatthesliderofpantographwearevenly,thecontact-line(electrifiedrailwaypowerfeedline)instraight-linesegmentsisarrangedaszigzagroute(curvese
5、ctionarrangedintheformofpolyline).Thedistancebetweenthecontact-lineofpositioningpointandthepantographcenterlinetrackiscalledoutstagger-value,whichisakeyindicatorofcontact-line.Stagger-valuecannotbeignored,thevaluetoosmallwillaffectthesliderofpantographwearevenlyandthepurposeofextendingusingli
6、fe;otherwise,insome...cases(suchascaughtinastiffwinds),causealargerangeoflateralmovementoftheroof(andthehigherthespeed,thegreaterpantographswingaround),somepartsofcontact-linewillbeinexcessoftheeffectiveworklengthofpantograph,sothatthestagger-valueofcontact-linebeyondthestandardrange,leadingt
7、odeteriorationofthecurrentcollection,andevencauseincorrectrunningofthepantographaccident.Pantograph-catenarymalfunctionwillresultininterruptionoftrainoperation,whichimpactonrailtransportseriously.Inordertoavoidthesephenomena,thestagger-valuea
