工业自动化控制 毕业论文外文翻译

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1、IndustrialAutomaticControl1)AnautomaticcontrolofindustryThemostcommonquantitiesmeasuredandcontrolledinindustryaretemperature,pressure,flow,andliquidlevel.Automaticcontrolofelectriccurrentflowtheoperationofnumerouselectricalapparatusandmachinerydependsonisalsomostwidelyused.Thetran

2、sitionfrommanualtoautomaticoperationofvariousindustrialinstallationshasbeeneffectedinallbranchesofindustryandthesubjectofautomaticcontrolisofferednowinmanycolleges.Thebestthingtobeginwithisansweringthequestion,”Whatisanautocontroller?Anautomaticcontrollerisamechanismmeasuringtheva

3、lueofavariablequantityorconditionanditoperationofthemeasuredvaluefromacertainpredeterminedone,thatis,fromsomeselectedreference.Asimpledevicelikethelightswitchonthewallcanbecalledacontroller.Butwedidmotsayan“automaticcontroller“.Thisdevicerequiresahumanoperatorinordertofuction.Ifwe

4、agreetoconsiderahumanoperatorasapartofthesystemwemayregardthiscommoneverydayexempleasakindofautomaticcontroller.Inthecaseofthelightswichonthewall,thehumanoperatormustbealwayspresentwithhisfingersontheswitchandwithhiseyeswatchingthelightnessoftheroom.Thewidespreaduseofelectricenerg

5、eryistoagreatextentduetotheeasewithwhichitcanbecontrolled.Anelectriccontrollerisadevicesorgroupofdevices,whichservestogoverninsomepredeterminedmannertheelectricpowerdeliveredtotheapparatus.Acontrollermaycontaincircuitswhoseprimaryactionisthatofsignalingandthetransmissionofinformat

6、ion,whichmaybeapartofthecontrol.Controlcircuitsmaybepneumatic,hydraulic.electricorelectronic,thesameclassificationbeingusedfordifferentkindsofcontrollers.Thefieldofinductionautomaticcontrollers.Thefieldofindustrialautomaticcontrol,fromapplicationviewpoint,isverywide.Thewidespreadu

7、seofautomaticcontrollershasbeenmadepossibleduetothefactthatindustrialcontrollersareequippedwithawiderangeofadjustmentswhichenablethemtobefittedtoalmostanytypeofprocess.Weknowanelectricsignaltobetransmittedoverwiresalmostinstantaneously.Inpneumaticandhydrauliccircuitsthereisatimela

8、gduetofrictionandinertiaoftheaira