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ID:1009917
大小:41.00 KB
页数:8页
时间:2017-11-06
《模糊控制PID的调节-毕业论文外文翻译》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、原文TuningOfFuzzyPIDControllersPIDstandsforProportional,IntegralandDerivative.ThefollowingexplanationsdescribePIDasitappliestotheprecisecontrolofaprocesstemperature.Aprocessisanareaorzonethatisbeingcontrolledatordriventoaprecisetemperature.PIDisacontrolmethodormodethathasthreefunct
2、ionsorvariables.Theproportionalactiondampensprocessresponse.Theintegralcorrectsfordroop.Droopisthedifferenceintemperaturebetweentheprocesssetpointandtheactualprocesstemperature.Thesetpointisthedesiredprocesstemperature.Thederivativesminimizeovershootandundershoot.Overshootistheam
3、ountintemperatureunitsthattheprocesstemperatureexceedsthesetpointbeforetheprocessstabilizes.Processstabilizationisachievedwhenthesetpointandprocesstemperaturesareequaloveradefinedperiodoftime.Undershootistheamountintemperatureunitsthattheprocesstemperaturefallsbelowthesetpointbef
4、oretheprocessstabilizes.Proportionalisthecontroloutputeffortinproportiontotheerrorfromsetpoint.Acontroloutputisasignalactiondeliveredinresponsetothedifferencebetweensetpointandprocesstemperature.Anoutputusuallycontrolsaheatingorcoolingaction.Theproportionalrangeisreferredtoasa“ba
5、nd”andisusuallymeasuredintemperatureunits.Ifaproportionalbandof20degreeswereappliedtoaprocessthatis10degreesbelowsetpoint,theheatoutputwouldbe50percent.Thelowertheproportionalband,thehigherthegain.Gainistheamountofamplificationusedinanelectricalcircuit.Proportionalbandissometimes
6、referredtoasgain.TheproportionalbandorPBisarangeinwhichtheproportioningfunctionofthecontrollerisactive.ThePBunitsareusuallyexpressedindegrees.Integralisacontrolactionthatautomaticallyeliminatesdrooporoffset.Offsetisthesameasdroopandisthedifferenceintemperaturebetweentheprocesstem
7、peratureandthesetpoint.Drooporoffsetisatypicalresultwhenusingproportionalcontrol.Integralisalsoknownas“Reset”.Isalsoknownas“Reset”.Derivativeistherateofchangeinaprocesstemperature.Largevaluespreventovershootbutcancausesluggishness.Itisalsoknownas“Rate”Sincefuzzycontrollersarenonl
8、inear,itismoredifficulttosetthecontrolle
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