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外文翻译--制冷压缩机速度的模糊控制.doc

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外文翻译--制冷压缩机速度的模糊控制.doc

中文译文FuzzycontroloftherefrigerationcompressorspeedAbstractInthisarticle,mentionisusuallyappliedtocommercialvaporcompressionrefrigerationinstalled,usingfuzzycontrolalgorithmtocontrolthespeedoftherefrigerationcompressorsoastoachievethemostefficientspeedtocontrolthetemperatureoftheairconditioning.Itsmainobjectiveisaccordingtothefuzzycontrolalgorithm,acontinuousregulationofthecompressorspeedbytheconverter,andtoestimatetheenergysavingeffectunliketraditionalthermostaticallycontrolled,bycontrollingtherefrigeratingcapacityofthecompressor,isappliedtothecontroltheswitchingoperationfrequencyofthecompressor50Hz.Controlthesupplycurrentofthemotorofthecompressorreachesthespeedchangerangeis3050Hz,lubricationproblemsduetotherotationalfrequencyistoolowtherewillbearesultofasplashsystemappearstodayareprovidedontherotationalfrequencyofthecompressorisgenerallynotconsideredlessthan30Hz.CanreplaceR22inthisrange,thetwomostappropriateamongtheworkingfluid,therearemany,suchasR407CR32/R125/R134a23/25/52groupandR507groupR125/R143A50/50good.Compressorspeedfuzzycontrolcomparedtotraditionaltemperaturecontrolforrefrigerationandcoolingsystems.ExperimentalresultsshowthatwhentheR407Castheworkingfluid,canachievesignificantenergysavings13.Itisnoteworthythat,fromenergypointofviewthebestresultscanbeachievedwhenthechangeofthecompressorspeed.Inaddition,takingintoaccounttheconvertercosts,paybackperiodthantheacceptablemodelsmoredecisive.Keywordscompressionsystem,coldchamber,pistoncompressors,variablespeed,articlesofassociation,FuzzyLogic,R407C,R5071.IntroductionVaporcompressioncoolingmeans,thoughdesignedtomeetthemaximumload,butinordertoprolonglife,usuallyworkingunderpartload,andthroughtheswitchingcycleregulation,operateatafrequencyof50Hz,andthusdeterminesthethermostaticcontroloftheenergyconsumption.Moreover,therefrigerantwhenlowpowerconsumptionisconsideredindirectreleaseofgreenhousegasesimprovedtheenergyconversionefficiencyoftheabovedescribedsystemcanreducesuchemissions.Avarietyofrefrigerationcapacitycontrolmethodandpartialloadtheorythatthecompressorspeedvariationisthemostefficienttechnology.Therefrigeratingcapacitycontrolmethodhasbeenanalyzedinthepast310years,includingimprovingthespeedofthecompressortoconstantlyachievethecoolingeffect.Theconvertercanbeusedforregulationofthecompressorspeed.Differenttypesofelectronicvariablespeeddrive,butthepulsewidthmodulationinverterPWMbecauseofitslowcostandhighefficiencyismostapplicable.Refrigerationcapacityofsuchcontrolsusedincommercialcompressor,thoughontheenergysavingadvantages,buttherearecertaindrawbackssuchasthecostoftheequipmentandcompressorlubricationandreliabilitytrouble.Thelastquestionis,Whenthethermalconverterofthesecondaryfluidinthegasphase,forexample,inthereviewplantisharmful.However,whenthesecondaryfluidintheliquidphasewhenitseemstobeadvantageous.Therefore,themainpurposeofthispaperistosetthecontrollertocontinuouslyregulatepumpcompressorandothersmallrefrigerationequipment.Suchcontrolallowsustoadjusttherefrigeratingcapacityofthecompressoratanytimetoobtainacoolingload,andthereforethecompressoroperationatotherfrequenciesmayalsobelessthan50Hz.Whentraditionaltemperaturecontrolforrefrigerationorothersmallrefrigerationsystem,thecompressorcanonlyworktodointhe50Hz.Inparticular,incontrasttothecommonlyusedvaporcompressioncoolingapparatusmentionedhereincanbeselectedaccordingtothefuzzylogiccontrolalgorithmintherefrigeratedtemperaturesthemostappropriatespeedofthecompressor.Inadditiontothefuzzylogic,thecompressorspeedcontrolmaybebyothertechnologiessuchastraditionalproportionindispensableandPIDcontrol.Inparticular,thefuzzylogiccontrol,comparePIDpermitbetteruseofexperimentalknowledgeandtakecontrollogicofanonmathematicalmodelaccordingtothedeviceworkingconditions.Moreover,afuzzycontrollerPIDcontrolissometimesnecessarytohavecomparableorbetterworkinthespecifiedoperatingpoint.InadditiontothementionedafuzzycontrollertoadjustthetimewhenthereisasuddenchangeinthecoolingloadonthefastbeatingsmallsignificantdynamicalcharacteristicsThisoftenleadstoarobustcontrol.Therefore,theexperimentaltestguidancecomparedfactorycompressorcoolingcapacitycontrolsystem,fuzzyalgorithmanddeterminethecompressoronoffcycletraditionalovenoperatesatafrequencyof50Hz.Oftheworkingfluidtobetested,R407CmainlyR32/R125/R134a23/25/52andR507R125/isofR143a50/50,R22ismostalternative.2pilotplantVaporcompressiontestdevice,asshowninFigure1showsageneralpurposecommercialequipmentiscomposedbythefollowingparts,aliquidreceiver,anaircondenser,transistorsandtwoexpansionvalves,athermostatisamanualrelyonthesupportfreezerinsideavaporcompressionwork.WantedamakerofsaidcompressorworkforavailabilitythefluidR22,R507andR407polyesteroillubrication,anditsspeedregulatedbyPWMconverter.Andagroupofthreephasevoltagerectifier,DC380V,50HzandastraighttodepositathreephaseACvoltageconverterinvertersadjustablevoltagefrequency.Withtwovalvesofthethreetubesmaytroublecanbesolved,becausewhenthevariationofthespeedofthecompressor,expansionvalvetheirworkisunknown.TheuseoftheexpansionvalveisspeciallydesignedforR407CandR507.R407andoperatingin50Hz,whenthetemperatureat20to10°Cwhenthecapacityofthecondenserchangeswithin1.41.8kWrange.Afixedtemperatureinthecondenserandtheimitationofexternalconditions,inadecisionheatthechannelanditswind.Theregulatortemperaturecontrolresistorcanbedetermined.Insomeexperimentalteststosimulatetheregulatorelectricheatingrefrigerationload,voltageandpowermeasurements.Table1liststhespecificationsoftheconversionapparatus.Thetestharnessisequippedwith32bitA/Dcardconnectedtothepersonalcomputer,ithasahighsamplingrateandbytheconversiondevicesimulationresults.DatacollectionsoftwareinLabVIEWenvironmenthasbeenachieved,andthroughabalanceofenergyandradiationsoftwareevaluationofthethermodynamicpropertiesofR407CandR507.3experimentaldescriptionToassesstheperformanceoftheproductwhenused,itisnecessarytocompareat50Hzbyswitchingcycleregulationandcontrolledbythefuzzyalgorithmenergyconsumption.Inexperimentaltests,theloadingofdifferenttypesofcoolinghavebeenconsidered.Firstofall,whenthedoorofrefrigerationperiodicallyswitchandinevitableandoutdoorairheatexchangeexperimenthasbeenachieved.Theseexperimentshavebeentestedinawiderangeoftemperaturetocompletetheopenrefrigeratordoors5minutesevery20minutesandwhentheoutsidetemperatureis18.8C,thecoldstoragetemperaturethusobtainedisgoodin5.0to25.8C.Inaddition,insomeofthetestsinthecoolingloadcanbeobtainedbytheelectricheaterlocatedintherefrigeratorcompartmentcanbecontrolled,whileinotherteststherealcoolingloadisconsideredtobe200kgFruitsandVegetables5.8Ccansave.Inthefirsttwocaseevery10minutestoopentherefrigerateddoortomimictherealworkenvironmentMoreover,theexperimentscarriedoutinthewinterandsummertest.Insummertestsinheatingelectricheatingbuttheoutsideofthecondenserismaintainedatatemperatureof32.8C,andinwinter,theoutdoorairtemperatureismaintainedat108C.Experimentalresultsmainlyreflectthepowerconsumption,goodpowerenergymeterstomeasuretheenergysavingeffectassessmentbe.ThelasttwodaysofthetesthasbeenachievedR407CandR507.ThecompressorspeedcontrolfuzzylogicFuzzylogiconbehalfallowsustogetinformationfromvague,ambiguousoruncertainanswermethodologyisdefined.Theconclusionscanbefoundtobedefinedstartingfromtheproximityoftheinformationanddataforthefuzzyprocessisverysimilartothatofthehumanbrain.Incontrasttotheclassicallogicmethoddepictthephenomenonofmathematicalmodelequationsthatrequireaprecisedefinition,fuzzylogicallowsustosolvetheproblemofclearlydefined,andforwhichitisdifficult,ifnotimpossible,todetermineanexactmathematicalmodel.Therefore,theexperienceandknowledgeofsuchshapeisnecessary.Inparticular,fuzzylogicisnonlinearcontrolanswertoyourquestion,alegitimatechoice.Infactnonlinearadoptrulesrelatingtothemembershiproleandreasoningprocessistreatedtoensureeasierimplementationandsmalldesignfee.Inthecontrolperformance,thedisadvantagesoftheothersideofthelinearapproximationofanonlinearmodelissimpleenough,butithaslimitationsandmayoccurinsomecasesexpensive.Moreover,thefuzzycontrollerisrobustandallowsustoexperiencethroughtheuseofotherrulesormembershiproleinaverysimplewaytoimproveorchange.Manyexamplesoffuzzycontrolcanbefoundinsomerecentapplications.Inparticular,intheheatingventilationandairconditioningindustrythereisawidevarietyofapplicationoffuzzycontroloftemperatureandmoisture.Afuzzycontrollerdesignrequiresthreefundamentalstages.Thefirstistoestablishtheinputandoutputvariables.Thesecondistodefinetheinputandoutputvariablesmembershiprole.Thelastofwhichistheselectionorformulaiccontrolrules.Themainobjectiveofthispaperistodetermineafuzzycontrollerisabletoregulatetheelectriccompressormotortrendofthesupplyfrequency.BlockdiagraminFigure2commercialavalaiblerefrigeratedtemperaturefuzzycontrolprocessreports.Inparticular,thefigureshowsatwoinputfuzzycontroller.Inputvariablesintheadjustmentpointtemperatureandairtemperaturebetweenthetemperaturedifferenceincoldstorage⊿T,ANDthetemperaturedifferencebetweenderivativesandtimed⊿T/dt.Fuzzyoutputvariableisthefrequencyofthecompressormotorfthesupplytrendfuzzylogicinaccordancewiththedeterminationofthepossiblevaluerepresentingvariablesofthefuzzyset.Traditionalfuzzylogictheorytheory,elementsmaybelongornotaparticularcollection,partofthemembershipallowstheelementsofthecollection.Eachvalueofthevariablesischaracterizedbychangeandcontinuityfromzerotoavalueofmembership.Therefore,itisdefinedtoestablishthemembershipofvariablerateispossibleinwhicheachofacollectionofvolatilemembershiprole.Fromaneffectivepointofview,thefuzzycontrollertoacceptthevalueoftheinputvariable,forsomeoperationsandtodeterminethevalueoftheproduct.Thisprocessischaracterizedbythreemainphasesfuzzycontrolinferencemechanismsandfuzzyoperation.Permittedtotransformthevalueisdefinedasthevalueoffuzzyfuzzyarithmeticprocessinferenceprocesstodeterminethefuzzyrulestobefixedaccordingtotheexperimentalrealityallowedtotransformvagueabouttheprocessoffuzzycontrolintoadefinedvalue.Thefuzzylogicofthemajordifficultieswithspecificexperiencenecessarybuildingdesignandafuzzycontrollerconnection.Accordingly,astheregulationoftheparametersofsomeexperimentalthinkwesetthetheexchangecompressorspeedcontrolvariable.Theexactrulesandspecialqualificationschoiceofappropriatechangecontroller.However,itwillbeconsideredfromtheenergysavingpointofviewitisconvenienttocontrolthespeedofthecompressor,becauseitworkstoalowerfrequency,butinthiscasewhentherequiredtemperatureoftheadjustmentpointwillbethemainandthetimenecessarytocompare,whenthecompressionmachinerunninga50Hznominalfrequency.Therefore,itmaysometimeshappenthat,evenwhenthecompressoroperationfrequencylowerthanthenominalenergysavingmaybepartiallyobtained,indeedbecausethecompressortooperateatlowerfrequencies,butinmanymoments.Accordingly,inordertoregulatetheworkingtimeofthecompressorinordertolowerthefrequencyisimportant,whenthemembershipoftherolewillbedefinedbytheinputandoutputvariablesofthefuzzyalgorithm,selectthesubsetofdigits,anditswidthmustbeappropriate,andBootfromtheexperimentalknowledge.Similarconsiderationsaboutthechoiceofrulesisneeded.End,theproposedalgorithmmembershiprolesandrulesofexperimentallyverified.Table2showsafixed

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