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1、毕业设计中英文翻译探测制导与控制技术学院：专业：High–SpeedDataAcquisitionSystemBasedonARM&Linear-CCDDongJianjunZhaoXiaojinDept.Four,TheFirstAeronauticalTechnicalCollegeoftheAirForceXinyang464000.China.Abstract:Thispaperpresentsahighspeedacquisitionsystemoflinear-CCDbasedonARM,high-speedlinear
2、-CCDandhigh-speedADCareselected.AsthesamplingspeedofA/DisslowerthantheworkingclockfrequencyofARM,CPLDandFIFOareusedasI/ObetweenA/DandARM.Itmakesthecircuitworksharmonious,simpleandeasycontrolling,andalsoincreasestheefficiencyofARM.Inordertoincreasethecommunicationspeed,
3、theUniversalSerialBus(USB)technologyisadoptedtocommunicatewiththePC.ARMisthekeyprocessorutilizedtocontrolthedatasampling,datacomputeanddatatransfer.Asaresult,thewholesystemworkseffective.Thesystemcanbeappliedtothehighspeeddataacquisitionandoperationsituationsfrommulti-
4、channelanalogsignals.KeyWords:ARM;LinearCCD;Contact-line;Pantograph;Stagger–valueI.IntroductionInelectrificationrailways,inordertoextendthelifeofthepantographonelectriclocomotives,sothatthesliderofpantographwearevenly,thecontact-line(electrifiedrailwaypowerfeedline)ins
5、traight-linesegmentsisarrangedaszigzagroute(curvesectionarrangedintheformofpolyline).Thedistancebetweenthecontact-lineofpositioningpointandthepantographcenterlinetrackiscalledoutstagger-value,whichisakeyindicatorofcontact-line.Stagger-valuecannotbeignored,thevaluetoosm
6、allwillaffectthesliderofpantographwearevenlyandthepurposeofextendingusinglife;otherwise,insomecases(suchascaughtinastiffwinds),causealargerangeoflateralmovementoftheroof(andthehigherthespeed,thegreaterpantographswingaround),somepartsofcontact-linewillbeinexcessoftheeff
7、ectiveworklengthofpantograph,sothatthestagger-valueofcontact-linebeyondthestandardrange,leadingtodeteriorationofthecurrentcollection,andevencauseincorrectrunningofthepantographaccident.Pantograph-catenarymalfunctionwillresultininterruptionoftrainoperation,whichimpacton
8、railtransportseriously.Inordertoavoidthesephenomena,thestagger-valueanditschangesshouldbetestedregularly.Therefore,al
