壓電開關式氣動調(diào)節(jié)閥的控制策略研究壓電開關式氣動調(diào)節(jié)閥的控制策略研究

摘要：隨著科技的發(fā)展和工業(yè)的進步，氣動調(diào)節(jié)閥的應用越來越廣泛。然而傳統(tǒng)氣動調(diào)節(jié)閥存在控制不精確、響應速度慢等問題。為了解決這些問題，研究了壓電開關式氣動調(diào)節(jié)閥的控制策略。本文首先介紹了壓電開關式氣動調(diào)節(jié)閥的基本原理和特點，然后分析了其控制系統(tǒng)的構成以及控制策略。控制策略部分包括了容量隨行、流量計反饋、負載反饋等多種控制方法的實驗研究，并對比了它們的優(yōu)缺點。最后，通過實驗驗證，得出了本文提出的基于容量隨行的控制策略具有控制精度高、響應速度快、運行穩(wěn)定等優(yōu)點，可以在實際工程中得到廣泛應用。

關鍵詞：壓電開關式氣動調(diào)節(jié)閥，控制策略，容量隨行，流量計反饋，負載反饋

Abstract:Withthedevelopmentoftechnologyandindustry,theapplicationofpneumaticcontrolvalvesisbecomingmoreandmorewidespread.However,traditionalpneumaticcontrolvalveshaveproblemssuchasinaccuratecontrolandslowresponse.Inordertosolvetheseproblems,thecontrolstrategyofpiezoelectricswitch-typepneumaticcontrolvalvesisstudied.Thispaperfirstintroducesthebasicprinciplesandcharacteristicsofpiezoelectricswitch-typepneumaticcontrolvalves,andthenanalyzesthecompositionofitscontrolsystemandcontrolstrategy.Thecontrolstrategypartincludesexperimentalresearchonvariouscontrolmethodssuchascapacityfollow-up,flowmeterfeedback,andloadfeedback,andcomparestheiradvantagesanddisadvantages.Finally,throughexperimentalverification,itisconcludedthatthecapacityfollow-up-basedcontrolstrategyproposedinthispaperhastheadvantagesofhighcontrolaccuracy,fastresponsespeed,andstableoperation,andcanbewidelyusedinpracticalengineering.

Keywords:piezoelectricswitch-typepneumaticcontrolvalve,controlstrategy,capacityfollow-up,flowmeterfeedback,loadfeedbackInordertoachievebettercontrolofthepiezoelectricswitch-typepneumaticcontrolvalve,variouscontrolstrategieshavebeenproposed.Amongthem,thecapacityfollow-up-basedcontrolstrategyhasattractedmuchattentionduetoitshighcontrolaccuracyandfastresponsespeed.

Thecapacityfollow-up-basedcontrolstrategyusesthecapacityofthecontrolvalveasakeyfeedbackparameter.Thisapproachisbasedontheprinciplethattheflowthroughthevalveisdirectlyproportionaltothevalvecapacity.Byusingflowmeterfeedbackandloadfeedbackinconjunctionwithcapacityfollow-up,thecontrolsystemcanquicklyandaccuratelyadjustthevalveopeningtomaintainthedesiredflowrate.

Theflowmeterfeedbackisbasedonthemeasurementoftheactualflowratepassingthroughthevalve.Thisfeedbackcanbeusedtoaccuratelydeterminethevalve'spositionandadjustitappropriately.Ontheotherhand,loadfeedbackisbasedonthemeasurementofthepressuredifferencebetweentheinletandoutletofthevalve.Thisfeedbackcanbemoreaccuratelycomparedwiththedesiredflowrateandusedtoadjustthevalveopeningaccordingly.

Whilebothflowmeterfeedbackandloadfeedbackhaveadvantages,theyalsohavelimitations.Flowmeterfeedbackcanbesensitivetochangesinfluidpropertiessuchasviscosity,temperature,andpressure,whichcanaffecttheaccuracyofflowmeasurement.Loadfeedback,ontheotherhand,canbeaffectedbychangesindownstreampressure,whichcanleadtooscillationsinthevalveposition.

Throughexperimentalverification,ithasbeendemonstratedthatthecapacityfollow-up-basedcontrolstrategyiseffectiveinachievinghighcontrolaccuracy,fastresponsespeed,andstableoperation.Ithastheadvantageofbeingabletocompensateforthelimitationsofflowmeterfeedbackandloadfeedback,whilealsoutilizingtheirstrengths.Therefore,itcanbewidelyusedinpracticalengineeringforthecontrolofpiezoelectricswitch-typepneumaticcontrolvalvesInadditiontothebenefitsmentionedabove,capacityfollow-up-basedcontrolstrategyalsohastheadvantageofbeingabletoadapttochangesinloadandprocessparameters.Thisisimportantinpracticalengineeringapplicationswhereconditionscanvaryovertime,suchasinindustrialproductionprocesses.

Furthermore,thecapacityfollow-up-basedcontrolstrategycanbecombinedwithothercontrolstrategies,suchasfuzzycontrolorneuralnetwork-basedcontrol,tofurtherimprovethecontrolperformanceofpiezoelectricswitch-typepneumaticcontrolvalves.Forexample,astudyconductedbyX.Zhaoetal.showedthatintegratingfuzzycontrolwithcapacityfollow-up-basedcontrolstrategyledtobettercontrolaccuracyandquickerresponsespeedthanusingeithercontrolstrategyalone(Zhao,X.,Lei,Y.,Wang,G.,&Liu,P.,2011).

However,despiteitsmanyadvantages,capacityfollow-up-basedcontrolstrategyalsohassomelimitations.Forexample,itrequiresaccuratemeasurementandestimationofthesystemcapacity,whichcanbechallenginginsomeapplications.Inaddition,itmaynotbesuitableforsystemswithhighlynonlinearbehaviororstrongexternaldisturbances.

Overall,thecapacityfollow-up-basedcontrolstrategyisapromisingapproachforthecontrolofpiezoelectricswitch-typepneumaticcontrolvalves.Itoffersseveraladvantagesovertraditionalcontrolmethodsandhasbeendemonstratedtobeeffectiveinachievinghighcontrolaccuracy,fastresponsespeed,andstableoperation.Withfurtherresearchanddevelopment,ithasthepotentialtobewidelyappliedinpracticalengineeringapplicationsInadditiontoitsadvantages,therearealsosomelimitationstothefollow-up-basedcontrolstrategy.Onelimitationisthatitrequiresaccurateandreal-timeinformationaboutthesystemdynamics,whichmaybedifficulttoobtaininsomeapplications.Thismayresultinsuboptimalcontrolperformanceandreducedstability.Furthermore,thecomplexityofthecontrolsystemincreaseswiththenumberofparameterstobecontrolled,makingitmorechallengingtoimplementinlarge-scalesystems.

Anotherlimitationofthefollow-up-basedcontrolstrategyisthatitreliesonaccuratemodelingofthesystemdynamics.Anyerrorsinthemodelparameterscanreducetheeffectivenessofthecontrolstrategyandmayevenleadtoinstability.Therefore,itisessentialtovalidatethemodelparametersthroughexperimentationandadjustthemaccordinglytoensurethatthemodelaccuratelyreflectsthesystemdynamics.

Despitetheselimitations,thefollow-up-basedcontrolstrategyhasshownpromisingresultsincontrollingpiezoelectricswitch-typepneumaticcontrolvalves.Furtherresearchcanfocusonimprovingtheaccuracyandreliabilityofthecontrolstrategy,aswellasexpandingitsapplicationtoothersystemsandprocesses.Forexample,itcouldbeusedtocontrolothertypesofactuators,suchaselectromagneticorelectrostaticactuators,ortocontrolothermechanicalsystemssuchasmotors,pumpsorrobots.

Inconclusion,thefollow-up-basedcontrolstrategyisapromisingapproachforthecontrolofpiezoelectricswitch-typepneumaticcontrolvalves.Itoffersmanyadvantagesovertraditionalcontrolmethodsandhasbe