中英文外文文献翻译-液压AGC系统故障诊断策略的研究

原文The2ndchapterhydraulicpressureAGCsystemfailurediagnosisstrategyresearchAsthelevelofautomationandthemillboardstripofmorehigh-qualityrequirements,theexecutivebodyofthemillandcontrolsystemperformancerequirementsarealsogettinghigherandhigher.Atpresent,theapplicationofhydraulictechnologyandthelevelofmetallurgicalequipmenttechnologyhasbecomethelevelofameasureof56to58.OnehydraulicAGC(AutomaticGaugeControl)systemisallmetallurgicalequipmenthydraulictechnologyapplicationsinatypicalrepresentativeofthemodernmillequipmentcoretechnology.AGChydraulicsystemsrunningisgoodorbad,themilldecidedtodirecttheworkofreliability.Foralongtime,becausetheoveralllevelofmachineryandequipmentgaps,therollingmillinChinamainlyreliesonimportsofequipment,technology,especiallyinthecoretechnologyislimited.Althoughinrecentyearsintheapplicationofadvancedtechnologyamajorbreakthrough,butstillconfinedtothesingleapplicationlevel.Therefore,theAGCinhydraulicsystemfaultdiagnosistechnologyofequipmentnotonlytoimprovethemillsproductivity,improveequipmentmaintenancemanagementlevelisofgreatsignificance,butalsodomesticmillequipmenttoimprovetheapplicationlevelisanimportantsocialsignificance.2.1hydrauliccomponentsandcharacteristicsofAGCsystem2.1.1hydraulicsystemcomposedofAGCStripmillsystemthroughtheAGCgage,displacementsensors,pressuresensorsandtensionofthecorrespondingparameterssuchasthecontinuousmeasurement,continuousadjustmentofhydraulicpressurecylinderdisplacement,pressureandtensionorrollingspeed,thecontrolpanelstripThicknessdifference.Inaddition,thefilmthicknesschangesincompensation,rolleccentricitycompensation,feedforwardcontrol,logisticscontrolandoptimizethespeedoftensionthickness,andotherfunctionstofurtherimprovetheaccuracy59.AGChydraulicsystemwhichisoneofthecoreequipment.Fromthefunction,AGChydraulicsystemisdividedintopartsandhydrauliccontrolsystemofhydraulicenergypart.1.Hydrauliccontrolsystemofthecontrolsystemfromelectro-hydraulicservovalveinthefueltankpressurecontrol,androlljointsorrollingmillpressuresettingsandcontrol.Inordertoimprovethecontrolsystemresponseperformance,thegeneraluseofelectro-hydraulicservovalvecontrolofthefueltankofacavity(workingcavity),anothercavity(back-pressurechamber)fromsomeenergytoprovideaconstantpressure.Startingfromthecontrolfunctions,acompletehydraulicsystemfromanumberofAGCthicknessofautomaticcontrolsystemcomponents,themostimportantcontrolring(seeFigure2-1)59,60:1)locationoftheclosed-loopcylinderpressurewitharollingconditionsinatimelyandaccuratecontrolofpressuredisplacement.xp1,xp2areoperatingsideandthetransmissionsideofthecylinderpistonrelativedisplacement,comesastheaveragexpdmeasureddisplacementvalues,xp0foragivensignal,xpgageismonitoringthefeedbackofCentral.2)rollingthroughthepressureoftheclosed-loopcontroloftworollingpressuretoachievetheobjectiveofcontrollingthethickness.Pdisrollingpressuremeasured,Psgivenfortheinitialvalue,Pvaluefortheamendment.3)Eliminationofthreegagemonitoringclosed-looprollerwear,thermalexpansionandsettings,suchastheimpactoferror.Mpforthemillverticalstiffness,Wforrollingpiecesofplasticstiffnesscoefficient,hdasmeasuredworkpiecethickness,hssetrollingforthickness.2.AGChydraulicenergyofthehydraulicsystem,hydraulicenergyisthefunctionofthehydrauliccontrolsystemtoprovidepressurestable,cleanworkingmedia,toprovideastableServoValvebeforethepressurevalvetoensurethatelectro-hydraulicservosystemThecontrolof61to65,butalsoforthereductionofthefueltankpressureontheback-pressurechambertoprovideastableworkingmedia.AGChydraulicsystemofenergyuseingeneralvariablesconstantpressurepump-Storage-safetyvalveofthestructure,inaddition,inordertoensurecleanlinessofthesystemworkingmedia,suchastemperature,setupintheenergypartofthepressureofhighpressureoilfiltersandbackLow-pressureoilfilters,coolersandothercomponents.2.1.2thehydraulicsystemfeaturesofAGCAGCshydraulicsystemisreliableoperationoftheentiremillproductionofthenormalizationoftheguaranteesystem.AsAGChydraulicsystemisacomplicatedmachine,electricity,liquidintegratedsystem,mechanicalsystem,electricalsystemandhydraulicsysteminanysystemoroneofitscomponentswillbethefaultcausedthesystemtoproducefailure.Therefore,AGChydraulicsystemmaintenanceandfaultdiagnosiswithconsiderabledifficulty.AGCinthemodernhydraulicsystem,designedmostlybythereliabilitydesigntechnologies,suchashydraulicpumps,filters,sensors,controllersuseofredundantdesign,hydraulicsystemsomebasicparameterssuchastanklevel,oiltemperature,Filters,plugthealarm,designedtomonitorallthepressurepoints,inaddition,therearedirectlyinvolvedinthecontrolofthedisplacementandpressuresignals,andsoon.Forsomesimplehydraulicsystemfailure,canbebasedonthesesignals,andoperatedbyexperiencedtechnicalstafftodealwithfailureandjudgement.However,theAGCsystemisahydraulic-mechanical,electrical,ofanintegratedcontrolsystem,thesystemformsandthereasonsforthefailureismultifaceted,fromthefunctions,thesystemnotonlystaticperformanceindicators,dynamicperformanceindicators.Thesignalsystemiscomplexanddiverse,someoftheslowerovertimeslowlychangingsignals(suchastanklevel,oiltemperature,etc.),whileothersaretransienthigh-frequencysignals.Atthesametime,thehydraulicsystemofitsowncharacteristics(suchastheclosureofthepowertransfer,measurableparametersofthepoor),therefore,experiencealone,relysolelyonthesesignalsalsocannotfaultthesystemforanalysis,thesystemcannotconductacomprehensiveAndaccuratefaultdiagnosisandprediction.Tothatend,mustbebasedonthestructuralcharacteristicsofequipmentfailureandincreasethenumberofmonitoringmechanism,togetthesystemtoreflectthestatusofsignals,andtheuseofadvancedfaultdiagnosistechnology(suchasexpertsystems,etc.)AGChydraulicsystemconditionmonitoringandfaultDiagnosis.2.2hydraulicsystemfailurediagnosisstrategy2.2.1object-orientedsystemsforthediagnosisoftheproposedstrategyAGCforhydraulicsystemfaultdiagnosistechnologyforthemodernizationofthemillandthenormalizationofproductionequipmentmaintenanceisofgreatsignificance.ButhowtocarryoutthehydraulicsystemAGCconditionmonitoringandfaultdiagnosis?AGCisahydraulicsystemcomponents(suchasthehydraulicpump,electro-hydraulicservovalve,etc.)tomonitortheimplementationof,orfocusonhydraulicsystemAGCcommitmentoftasks,fromtheproductionprocessonthehydraulicsystemAGCthespecialrequirementsoftheAGCinthehydraulicsystemischaracterizedsignificanceoftheparameterstomonitorForthekeycomponentsinthehydraulicsystem(suchashydraulicpumps,hydrauliccylinderormotor,thereliefvalve,electro-hydraulicservovalve,etc.)orfailureofthefailuremechanismformsofresearch,athomeandabroadhavecarriedoutagreatdealofresearch,andmadesomeImportanttheoreticalorapplicationoftheresults23to30,forthehydraulicsystemfaultdiagnosistechnologyin-depthstudylaidthefoundationinrecentyears,scholarsathomeandabroadforthehydraulicsystemfaultdiagnosisusingavarietyofmethodstoconductextensiveresearch66to70.Buttraditionally,hydraulicsystemfaultdiagnosistechnologyofcomparativeemphasisonresearchsystemsinthekeycomponentsofthefailuremechanism,andtheproductionprocessgiventhemissionofhydraulicequipment,hydraulicequipmenttocompletetheproductionprocesshasadvantagesofthefunctionofthelackofconcern71,72.Intheactualproductionsystem,forhydraulicequipmenttoplaythenormalfunctionofthecomponentsofconcernisnecessary,butattentionshouldfocusonthefunctionalcomponentsoftheindex,ratherthanthespecificcomponentsoffailure.Becauseoftheactualsystems,componentscandamagethereplacementand,inthemoderndesignofthehydraulicsystemhavebeenmaderedundantdesigntechnologyand,ifnecessary,canusetheswitch,thesystemcanguaranteethenormalwork.Thecomponentscanbedamagedbyoff-lineinthelaboratoryfortestingandrepair,ifnecessary,thepurchaseofnewcomponents.Therefore,forAGCmillhydraulicsystemfaultdiagnosistechnologyresearch,shouldbekeycomponentsofthesystemtheirpredecessorsofthefaultdiagnosisonthebasisofresearch,focusonmonitoringthehydraulicsystemAGCfunction,useofonlineandofflinemonitoringofthecombinationThemethod,theuseofadvancedIntelligentfaultdiagnosistechnologytoAGChydraulicsystemconditionmonitoringandfaultdiagnosis.1.Focusonelectro-hydraulicservosystemdynamicmonitoringofelectro-hydraulicservosystemadjustsspeed,high-frequencyresponsecharacteristics,foritsstaticcharacteristicsofthestudyandcalculationhasbeenverymature,buttheimpactofelectro-hydraulicservosystembecauseofthedynamicperformanceofmanyfactors,Notallowedtoselecttheparametersandotherreasons,theoreticalcalculationsandtheactualstateofthedifferencebetweenthelargerandequipmentusedintheprocess,becauseofwearandagingcomponents,parameterdrift,thecouplingofsystemsmaintenanceanddebuggingimproperinterference,AGChydraulicsystemwillleadtodeclineintheperformance,serious,willaffectthequalityofproductsandequipmentforthereliableoperation.Therefore,AGChydraulicsystemshouldbeestablisheddynamicperformancemonitoringdevices,on-linemonitoringsystemofhydraulicAGCdynamicperformanceanddemonstrateitstrend,basedonmonitoringdataandexperience,samplesandfailuretoestablishcriteriaforuseofexpertsystemsfaultdiagnosis.2.Electro-hydraulicservofocusonenergyparametersofthemonitoringsystemofhydraulicenergyfunctionistoprovideforthehydrauliccontrolsystempressurestable,cleanworkingmedia.Inthehydraulicsystemfeaturesapointsystemtoreflectthepressureofthemainfunctionalcharacteristics,suchasthehydraulicpumpbeforethepressureoftheoil-absorbingLvyouQireflecttheplug,beforeandafterthepressurepumptoreflectthepumprunning,afterthegroupaccumulatorThepressureofwhatthesystemcanquicklyprovidepressuredisordersorerrors,suchaselectricalcontrolfailure,thefunctionalpointofthepressuremonitoringsystemperformancemonitoringofenergyisthefocus.70%ofthehydraulicsystemfailureisbecauseofthepollutionarisingfromthemedia,sointhehydraulicsystem,oilfiltershavetakenthenecessarymeasures,particularlyintheelectro-hydraulicservosystem,afiltertotakeredundancyDesigntoensurethatthemediaclean.Nevertheless,asthereplacementofcomponentsinthesystem,pipelinerupture,andotherfactors,willresultinthemediumofpollution,therefore,shouldmakeperiodictestingofoil.Oiltemperatureoftheelectro-hydraulicservosystemwillhaveanimpactontheperformanceofthesystemofoiltemperaturemonitoringandcontrolarealsoimportant.Inaddition,thelevelofchangefromthesystemtosomeextentreflecttheoperationalstatus.3.Offlineandonlinemonitoringequipmenttomonitorstateofcombiningthemaintenanceandfaultdiagnosisequipmentmustbeintherunningoftheequipmentconditionmonitoringandfaultdiagnosis.Butfortheactualsystem,basedonindicatorsofthemonitoringsystem,themonitoringtechnologycouldbeofflineandonlinemonitoringtechnologyintegration.Forexample,theelectro-hydraulicservosystemofthekeycomponents-ServoValve,itisnecessarytoconductacomprehensiveon-linemonitoring,technicalcomplexity,andbecauseofcomplexstatesystem,monitoringisnotnecessarilyaccurate,andinthelaboratory,ServoValveThedetectionandrepairtechnologyhasbeenquiteperfect,itcanbeServoValvereplacementdownandsenttolaboratoriesfortesting,maintenance,identificationoftheirperformance.Oilcleanlinessforthetestdespitethecontinuousmonitoringcanbedoneonline,butundernormalcircumstancesandnotso,canthecycleofacertainsampletesting,andmonitoringofoil.Onlineandofflinemonitoringtomonitortheintegrationofnotonlycanreducethecostofexperts,ismoreimportanttoimprovethefaultdiagnosisexpertsystemspeedandachievetheanticipatedmaintenanceequipment.2.2.2DiagnosticSystemmodularstrategyAGChydraulicsystemisacomplicatedmachine,electricity,liquidintegratedsystem,somechanicalsystem,electricalsystemandhydraulicsysteminwhichanysystemorcomponentsofafaultsystemasawholewilltriggerafault.Inthispaper,mechanicalsystemsandelectricalsystems(includingalltypesofsensors)onthefaultnotonlyfocusontheirownhydraulicsystemfailuremechanismanddiagnosticmethods.Asmentionedabove,fromthefunctional,hydraulicAGCsystemisdividedintopartsandhydrauliccontrolsystemofhydraulicenergypart.Hydraulicenergypartofthefunctionistoprovidesomeofthepressurecontrolsystemstable,cleanworkingmedia,andsomeofthecontrolsystem,itsdynamicperformanceindicatorsisthesystemstatusmonitoringandfaultdiagnosisoffocus.Fromtheconditionmonitoringandfaultdiagnosispointofview,thetwopartsofthestateinformationsystemregardlessofformorcharacteristicsaregreatlydifferentfrom,andthatthereisgreatrelevance,therefore,thehydraulicsystemofAGCconditionmonitoringandfaultdiagnosiscanbedividedintoTwosubsystems(diagnosticmodule),thecontrolsystemandenergysystemsrespectivelyfortheirconditionmonitoringandfaultdiagnosis,andtwodiagnosticsystemsworktogethertocompletethehydraulicsystemofAGCconditionmonitoringandfaultdiagnosis.DiagnosticSystemmodularhasthefollowingadvantages:modularsystemofthemodulethaninthecorrespondingnon-modulardiagnosticsystemmuchsimpler,soalloftheknowledgebasemodule(stateinformation,reasoningrules,etc.)canbegreatlyreducedcapacity,easy-diagnosticsystemconstruction,whentheuseofneuralnetworksAsystemofself-learning,learningandperformancecharacteristicsofeasygeneralizationisguaranteed;relativelysystemasawhole,theinputandoutputinformationmodulegreatlysimplified,andbyshorteningthepathreasoning,therefore,eachmoduleofthereasoningspeed,learningability,canbegreatlyimproved,theuseofparallelprocessingtechnology,canachievereal-timefaultdiagnosissystemrequirements;inpracticalapplication,generallyparalleltreatmenttoanindependentmodule,makingmodularapplicationofthediagnosticsystemmoreflexibilityandadaptabilityofthescene;modularsystemofthediagnosticconclusionsmoreeasilyexplained,becausethediagnosissystemintheclearmandateofthemodule,functionidentification,andthediagnosisoftherelationshipbetweenthemodulesclearly,makingthewholeprocessofdiagnosissystemworkmoreuncertain;modularstructureisconducivetothefutureofothersubsystemswillbethestatusofmonitoringandfaultdiagnosisintegrationbetweenmodules,AGCinthehydraulicsystemfaultdiagnosisandstatedetectiontechnologyresearch.2.2.3AGChydraulicsystembasedonneuralnetworkfuzzyexpertsystemdiagnosisstrategyThehydraulicsystemfaultdiagnosistechnologyandapplicationstoabsorbsomeoftheotherareasofresults-based,inparticular,signalprocessing,patternrecognition,neuralnetworksandfuzzyreasoninginareassuchasthetheoryinlightofthespecifichydraulicsystemfailureandthefailureofthemechanism,Theestablishmentofaknowledgebaseandcorrespondingrulesfortheextractionofstatemonitoringsignalpatternrecognitionorclassification,thesystemfaultdiagnosis,analysisofthereasonsforfailure,faultlocationandfaultprediction.Manyapplicationsshowthat,combiningartificialintelligenceandknowledgeofexpertsinthefieldofintelligentexpertsystemforthehydraulicsystemisaneffectivewaytofaultdiagnosis10,11.Faultdiagnosisprocessisbasedontheobjectofunusualsymptoms,basedonpriorknowledge(thefaultsamples)throughcertainrulesofreasoning,judgementtargetlocationandidentificationofthefaultcausedthepossiblereasonsforfailure.Fuzzyexpertsystemcanbebasedonasmallerscalefaultsamplesandtherulesofreasoning,rapiddeterminefault,however,becauseofitsmembershipfunctionandfuzzyrulesdifficulttoadaptandmodify,accesstoknowledgeoftheexistenceofbottlenecks,thereasoningofuncertaintyandself-learningdifficulties问题.Ontheotherhand,neuralnetworkshaveaverygoodabilitytolearn,throughon-sitemonitoringsystemsignalslearning,knowledgeindealingwiththeunknownandadded.Acombinationofboth,couldplaytheirrespectiveadvantages,AGCamenabletothehydraulicsystemfaultdiagnosis.Figure2-2AGCisahydraulicfaultdiagnosisexpertsystemsbasicstructure.AsshowninFigure2-2AGChydraulicfaultdiagnosissystem,theknowledgetodescribetwoways:throughexperimentsandasummaryofthefactswillbeknowledgeandexpertiseintotheformofvaguerules,storedintheknowledgebase,andwiththecorrespondingFuzzyneuralnetworktooptimizethefuzzyrules,theotheristhroughon-sitehistoricaldataonthefuzzyneuralnetworkreasoningmachinetraining,accesstonon-deterministicknowledge,andthroughhuman-machinedialoguetocomplementtheknowledgebase.Coordinatingbodyfordifferentsituationswithfuzzyinferenceandneuralnetworksystemfordiagnosis,drawtheappropriatediagnosis.IMIS,thispapermillAGChydraulicsystemtotakethediagnosisstrategy:1.Object-orientedsysteminthepreviousstrategyofthekeycomponentsofthesystemsfaultdiagnosisonthebasisofresearch,focusonmonitoringthehydraulicsystemAGCfunction.Hydraulicenergyonthepartofthemainpressuremonitoringsystemstability,andsomeofthecontrolsystem,mainlytomonitorthedynamicperformanceindicators.2.Onlineandofflinemonitoringofcombiningon-linemonitoringsystemandthemajorcomponentsofthefunction,themaincomponentsofflinetestthespecificformoffailure.3.Modularsystemofdiagnosiswillbedividedintospecifictargetsofenergyandsomeofthecontrolsystem,improvethediagnosticsystemofspeedandaccuracy.4.Neuralnetworksandfuzzytheoryofintegrationofthediagnosticmethodswithexpertsystembasedonfuzzyreasoningexpertsystemtosolvethesystemofknowledgeofuncertainty,andneuralnetworkintegratedsystemofknowledgetosolvetheaccess,rulesoptimization,andotherissues.Thispaperwillbebasedontheabovestrategyforthediagnosis,AGCfromthehydraulicsystemstatussignalsintheextractionandtreatment,diagnosticexpertsystemandtheestablishmentofthestructure,diagnosticexpertsystemtoachieveintermsofstartagainstAGChydraulicsystemfaultdiagnosistechnologyresearch.2.3hydraulicsystemdynamicperformanceofAGCAGChydraulicsystemdynamicperformanceindicatorsAGCisthehydraulicsystemconditionmonitoringandfaultdiagnosisofthekeytargets,throughthehydraulicsystemofAGCdynamicperformanceofthesimulation,intheprocessofrollingchangesthedynamiconthequalityofsystems,AGChydraulicsystem,notonlyfortheoptimaldesignoffar-reachingsignificance.Atthesametime,thehydraulicmechanismoftheAGCsystemanalysisanddynamicsimulation,thehydraulicAGCfaultdiagnosisexpertsystemofdeepknowledge(basedonthemodelbasedonknowledgesuchastheARModelARspectrum,etc.)haveaccesstotheguidingroleofthehydraulicAGCfaultdiagnosisexpertknowledgebasesystem,theestablishmentandthedeterminationofrulesofreasoningisofgreatsignificance.Atpresent,theAGChydraulicsystemanalysisandsimulationandmorefocusedonnotconsiderrollingmillrollandchangesinthecharacteristicsoftheirown,rollingmillrollandthedeformationoffactorsastheconstantinterferenceof,orthesystemSetcompensation,butonlyonthehydraulicsystemofitsownresponsecharacteristics73to75,andtheactualsyste