模糊控制pid的调节-毕业论文外文翻译

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1、原文TuningOfFuzzyPIDControllersPIDstandsforProportional，IntegralandDerivative.ThefollowingexplanationsdescribePIDasitappliestotheprecisecontrolofaprocesstemperature.Aprocessisanareaorzonethatisbeingcontrolledatordriventoaprecisetemperature.PIDisacontrolmethodormod

2、ethathasthreefunctionsorvariables.Theproportionalactiondampensprocessresponse.Theintegralcorrectsfordroop.Droopisthedifferenceintemperaturebetweentheprocesssetpointandtheactualprocesstemperature.Thesetpointisthedesiredprocesstemperature.Thederivativesminimizeove

3、rshootandundershoot.Overshootistheamountintemperatureunitsthattheprocesstemperatureexceedsthesetpointbeforetheprocessstabilizes.Processstabilizationisachievedwhenthesetpointandprocesstemperaturesareequaloveradefinedperiodoftime.Undershootistheamountintemperature

4、unitsthattheprocesstemperaturefallsbelowthesetpointbeforetheprocessstabilizes.Proportionalisthecontroloutputeffortinproportiontotheerrorfromsetpoint.Acontroloutputisasignalactiondeliveredinresponsetothedifferencebetweensetpointandprocesstemperature.Anoutputusual

5、lycontrolsaheatingorcoolingaction.Theproportionalrangeisreferredtoasa“band”andisusuallymeasuredintemperatureunits.Ifaproportionalbandof20degreeswereappliedtoaprocessthatis10degreesbelowsetpoint，theheatoutputwouldbe50percent.Thelowertheproportionalband,thehighert

6、hegain.Gainistheamountofamplificationusedinanelectricalcircuit.Proportionalbandissometimesreferredtoasgain.TheproportionalbandorPBisarangeinwhichtheproportioningfunctionofthecontrollerisactive.ThePBunitsareusuallyexpressedindegrees.Integralisacontrolactionthatau

7、tomaticallyeliminatesdrooporoffset.Offsetisthesameasdroopandisthedifferenceintemperaturebetweentheprocesstemperatureandthesetpoint.Drooporoffsetisatypicalresultwhenusingproportionalcontrol.Integralisalsoknownas“Reset”.Isalsoknownas“Reset”.Derivativeistherateofch

8、angeinaprocesstemperature.Largevaluespreventovershootbutcancausesluggishness.Itisalsoknownas“Rate”Sincefuzzycontrollersarenonlinear，itismoredifficulttosetthecontrolle