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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:Thispaperpresentsahighspe
2、edacquisitionsystemoflinear-CCDbasedonARM,high-speedlinear-CCDandhigh-speedADCareselected.AsthesamplingspeedofA/DisslowerthantheworkingclockfrequencyofARM,CPLDandFIFOareusedasI/ObetweenA/DandARM.Itmakesthecircuitworksharmonious,simpleandeasycontrolling
3、,andalsoincreasestheefficiencyofARM.Inordertoincreasethecommunicationspeed,theUniversalSerialBus(USB)technologyisadoptedtocommunicatewiththePC.ARMisthekeyprocessorutilizedtocontrolthedatasampling,datacomputeanddatatransfer.Asaresult,thewholesystemworks
4、effective.Thesystemcanbeappliedtothehighspeeddataacquisitionandoperationsituationsfrommulti-channelanalogsignals.KeyWords:ARM;LinearCCD;Contact-line;Pantograph;Stagger–valueI.IntroductionInelectrificationrailways,inordertoextendthelifeofthepantographon
5、electriclocomotives,sothatthesliderofpantographwearevenly,thecontact-line(electrifiedrailwaypowerfeedline)instraight-linesegmentsisarrangedaszigzagroute(curvesectionarrangedintheformofpolyline).Thedistancebetweenthecontact-lineofpositioningpointandthep
6、antographcenterlinetrackiscalledoutstagger-value,whichisakeyindicatorofcontact-line.Stagger-valuecannotbeignored,thevaluetoosmallwillaffectthesliderofpantographwearevenlyandthepurposeofextendingusinglife;otherwise,insomecases(suchascaughtinastiffwinds)
7、,causealargerangeoflateralmovementoftheroof(andthehigherthespeed,thegreaterpantographswingaround),somepartsofcontact-linewillbeinexcessoftheeffectiveworklengthofpantograph,sothatthestagger-valueofcontact-linebeyondthestandardrange,leadingtodeterioratio
8、nofthecurrentcollection,andevencauseincorrectrunningofthepantographaccident.Pantograph-catenarymalfunctionwillresultininterruptionoftrainoperation,whichimpactonrailtransportseriously.Inordertoavoidthesephenomena,thestagger-valueanditsch
