the-position-control-system位置控制系统大学毕业论文外文文献翻译及原文

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1、文献文献文献文献毕业设计（论文）外文文献翻译资料中文题目：位置控制系统资料英文题目：ThePosition-ControlSystem资料来源：资料发表（出版）日期：院（部）••专业：班级：姓名：学号：指导教师.•翻译日期:2017.02.14ThePosition—ControlSystemTheregulator，whoseobjectistomaintainthevalueofsomephysicalquantityatafixedlevelinspiteofdisturbances，isanimportantexampleofaclosed-loopsy

2、stem.Equallyimportantandmorechallenginginengineeringdesignistheservo-mechanismwhoseobjectistofollowinputcommands.Anexampleofsuchadeviceistheposition-controlservo-mechanismwhichmustreproduceatsomeremotepointthemotionappliedtoahandwheellocatedatalocalcommandstation.Theoutputmotionmight

3、beusedtodriveaheavyobject(suchasamissilelauncher)intoarequiredposition;poweramplificationofthecommandandaccuratereproductionarethusnecessary.Thesignalscanbetransmittedbydirectmechanicallinkageorbyhydraulic，pneumatic,orelectricconduit.Apartfrommechanicallinkagethemostrapidtransmission

4、maybeachievedwithelectricalconnectionandthisisoftenbutnotalwaysused.Whereitisused,themechanicalinputandoutputsignalsarefirstconvertedintoproportionalelectricalsignalsandthentransmittedthroughwirestoasubtractingdevicewhichproducesasignalproportionaltotheerror.Thelow-powererrorsignalis

5、usedtodriveanamplifierwhichalsoreceivespowerfromanexternalsourceanddeliverscontrolledpowertothemotor.Thecombinationoftransducersandsubtractingelementformtheerrordetector，theamplifieristhecontrollerandthemotortogetherwithitsgearboxformtheoutputelement.Theamplifiermaybepurelyelectrical

6、ifthemotoriselectricalbutmustbeeitherelectro-hydraulicorelectro-pneumaticifthemotoriseitherhydraulicorpneumatic.ItisemphasizedthattheobjectofthesystemistomaketheRotatablemasscopyasnearlyaspossiblethemotionofthehandweel.Letusconsiderwhatwillhappenifthepositionofthehandwheelisturnedver

7、yrapidlythroughanangle0，themassbeinginitiallyatrest.Initiallythemasshasnovelocityandtheoutputposition0(、iszero,thusasignalk^.instaneouslyappearsattheterminalsoftheamplifier;powerfromthesourceisallowedtoreachthemotorwhichthenbeginstodrivethemasssoastoreducetheerror.As3(}approachesthee

8、rrorbecomesn