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.Automaticcontrolofelectriccurrentflowtheoperationofnumerouselectricalapparatusandmachinerydependsonisalsomostwid

2、elyused.Thetransitionfrommanualtoautomaticoperationofvariousindustrialinstallationshasbeeneffectedinallbranchesofindustryandthesubjectofautomaticcontrolisofferednowinmanycolleges.Thebestthingtobeginwithisansweringthequestion，”Whatisanautocontroller?Anautomaticcontro

3、llerisamechanismmeasuringthevalueofavariablequantityorconditionanditoperationofthemeasuredvaluefromacertainpredeterminedone,thatis,fromsomeselectedreference.Asimpledevicelikethelightswitchonthewallcanbecalledacontroller.Butwedidmotsayan“automaticcontroller“.Thisdevi

4、cerequiresahumanoperatorinordertofuction.Ifweagreetoconsiderahumanoperatorasapartofthesystemwemayregardthiscommoneverydayexempleasakindofautomaticcontroller.Inthecaseofthelightswichonthewall，thehumanoperatormustbealwayspresentwithhisfingersontheswitchandwithhiseyesw

5、atchingthelightnessoftheroom.Thewidespreaduseofelectricenergeryistoagreatextentduetotheeasewithwhichitcanbecontrolled.Anelectriccontrollerisadevicesorgroupofdevices，whichservestogoverninsomepredeterminedmannertheelectricpowerdeliveredtotheapparatus.Acontrollermaycon

6、taincircuitswhoseprimaryactionisthatofsignalingandthetransmissionofinformation，whichmaybeapartofthecontrol.Controlcircuitsmaybepneumatic,hydraulic,electricorelectronic,thesameclassificationbeingusedfordifferentkindsofcontrollers.Thefieldofinductionautomaticcontrolle

7、rs.Thefieldofindustrialautomaticcontrol,fromapplicationviewpoint，isverywide.Thewidespreaduseofautomaticcontrollershasbeenmadepossibleduetothefactthatindustrialcontrollersareequippedwithawiderangeofadjustmentswhichenablethemtobefittedtoalmostanytypeofprocess.Weknowan

8、electricsignaltobetransmittedoverwiresalmostinstantaneously.Inpneumaticandhydrauliccircuitsthereisatimelagduetofrictionandinertiaoftheaira