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.Thetransitionfro

2、mmanualtoautomaticoperationofvariousindustrialinstallationshasbeeneffectedinallbranchesofindustryandthesubjectofautomaticcontrolisofferednowinmanycolleges.Thebestthingtobeginwithisansweringthequestion,”Whatisanautocontroller?Anautomaticcontrollerisamechanismmeasuringthevalueofavariablequan

3、tityorconditionanditoperationofthemeasuredvaluefromacertainpredeterminedone,thatis,fromsomeselectedreference.Asimpledevicelikethelightswitchonthewallcanbecalledacontroller.Butwedidmotsayan“automaticcontroller“.Thisdevicerequiresahumanoperatorinordertofuction.Ifweagreetoconsiderahumanoperat

4、orasapartofthesystemwemayregardthiscommoneverydayexempleasakindofautomaticcontroller.Inthecaseofthelightswichonthewall,thehumanoperatormustbealwayspresentwithhisfingersontheswitchandwithhiseyeswatchingthelightnessoftheroom.Thewidespreaduseofelectricenergeryistoagreatextentduetotheeasewithw

5、hichitcanbecontrolled.Anelectriccontrollerisadevicesorgroupofdevices,whichservestogoverninsomepredeterminedmannertheelectricpowerdeliveredtotheapparatus.Acontrollermaycontaincircuitswhoseprimaryactionisthatofsignalingandthetransmissionofinformation,whichmaybeapartofthecontrol.Controlcircui

6、tsmaybepneumatic,hydraulic.electricorelectronic,thesameclassificationbeingusedfordifferentkindsofcontrollers.Thefieldofinductionautomaticcontrollers.Thefieldofindustrialautomaticcontrol,fromapplicationviewpoint,isverywide.Thewidespreaduseofautomaticcontrollershasbeenmadepossibleduetothefac

7、tthatindustrialcontrollersareequippedwithawiderangeofadjustmentswhichenablethemtobefittedtoalmostanytypeofprocess.Weknowanelectricsignaltobetransmittedoverwiresalmostinstantaneously.Inpneumaticandhydrauliccircuitsthereisatimelagduetofrictionandinertiaoftheaira