简介:Acompoundneuralnetworkisutilizedtoidentifythedynamicnonlinearsystem.Thisnetworkiscomposedoftwoparts:oneisalinearneuralnetwork,andtheotherisarecurrentneuralnetwork.Basedontheinversetheoryacompoundinversecontrolmethodisproposed.Thecontrollerhasalsotwoparts:alinearcontrollerandanonlinearneuralnetworkcontroller.Thestabilityconditionoftheclosed-loopneuralnetwork-basedcompoundinversecontrolsystemisdemonstratedbasedontheLyapunovtheory.Simulationstudieshaveshownthatthisschemeissimpleandhasgoodcontrolaccuracyandrobustness.
简介:Invertedpendulumsareimportantobjectsoftheoreticalinvestigationandexperimentintheareaofcontroltheoryandengineering.Theresearchesconcentrateontherigidfinitedimensionalmodelswhicharedescribedbyordinarydifferentialequations(ODEs).Completerigidityistheapproximationofpracticalmodels;Elasticityshouldbeintroducedintomathematicalmodelsintheanalysisofsystemdynamicsandintegrationofhighlyprecisecontroller.Anewkindofinvertedpendulum,elasticinvertedpendulumwasproposed,andelasticitywasconsidered.MathematicalmodelwasderivedfromHamiltonianprincipleandvariationalmethods,whichwereformulatedbythecouplingofpartialdifferentialequations(PDE)andODE.Becauseofinfinitedimensional,systemanalysisandcontrolofelasticinvertedpendulumismoresophisticatedthantherigidone.
简介:Operationaimofballmillgrindingprocessistocontrolgrindingparticlesizeandcirculationloadtoballmillintotheirobjectivelimitsrespectively,whileguaranteeingproducingsafelyandstably.Thegrindingprocessisessentiallyamulti-inputmulti-outputsystem(MIMO)withlargeinertia,strongcouplinganduncertaintycharacteristics.Furthermore,beingunabletomonitortheparticlesizeonlineinmostofconcentratorplants,itisdifficulttorealizetheoptimalcontrolbyadoptingtraditionalcontrolmethodsbasedonmathematicalmodels.Inthispaper,anintelligentoptimalcontrolmethodwithtwo-layerhierarchicalconstructionispresented.Basedonfuzzyandrule-basedreasoning(RBR)algorithms,theintelligentoptimalsettinglayergeneratestheloopssetpointsofthebasiccontrollayer,andthelattercantracktheirsetpointswithdecentralizedPIDalgorithms.Withthedistributedcontrolsystem(DCS)platform,theproposedcontrolmethodhasbeenbuiltandimplementedinaconcentrationplantinGansuprovince,China.Theindustrialapplicationindicatesthevalidationandeffectivenessoftheproposedmethod.
简介:TheproblemofpicksequencingintherotaryrackS/Rsystem(PPS-RRS)isinvestigatedwiththeobjectiveofminimizingtheexecutiontime.TherotaryrackS/RsystemconsistsofoneS/Rmachineandmultiplelevelsofcarouselsthatcanrotateindependentlyinbi-directions.Theroutingpolicy,namelythedecisiononthestorageorretrievalsequence,dominatestheefficiencyandthethroughputforsuchS/Rsystems,duetothecomplicatedrelationshipbetweenalllevelsofcarouselsandtheS/Rmachine.ForthepurposeofoptimizingthePPS-RRS,acomputationalmodelisdevelopedintermsofexecutiontimeforpickingmultipleitemsinonetrip.CharacteristicsofthePPS-RRSareanalyzedandalocalsearchheuristicbasedonanewlyproposedneighborhoodispresented.Integratedwiththeproposedlocalsearchprocedureanewhybridgeneticalgorithmisdeveloped.Experimentalresultsdemonstratethestructurecharacteristicsofgoodsequenceandtheefficiencyandeffectivenessoftheproposedsequencingalgorithms.
简介:Fuzzycontrolproblemsforsystemswithboundeduncertaindelayswerestudied.BasedonLyapunovstabilitytheoryandmatrixtheory,anonlinearstatefeedbackfuzzycontrollerwasdesignedbylinearmatrixinequalities(LMI)approach,andtheglobalexponentialstabilityoftheclosed-loopsystemwasstrictlyproved.Forafuzzycontrolsystemwithboundeduncertaindelays,undertheglobalexponentialstabilityconditionwhichisreducedtoplinearmatrixinequalities,thecontrollerguaranteesstabilityperformancesofstatevariables.Finally,thesimulationshowsthevalidityofthemethodinthispaper.
简介:Thispaperdealswiththeproblemofrobuststabilityforcontinuous-timesingularsystemswithstatedelayandparameteruncertainty.Theuncertainsingularsystemswithdelayconsideredinthispaperareassumedtoberegularandimpulsefree.Bydecomposingthesystemsintoslowandfastsubsystems,arobustdelay-dependentasymptoticstabilitycriteriabasedonlinearmatrixinequalityisproposed,whichisderivedbyusingLyapunov-Krasovskiifunctionals,neithermodeltransformationnorboundingforcrosstermsisrequiredinthederivationofourdelay-dependentresult.Therobustdelay-dependentstabilitycriterionproposedinthispaperisasufficientcondition.Finally,numericalexamplesandMatlabsimulationareprovidedtoillustratetheeffectivenessoftheproposedmethod.
简介:Aneuro-fuzzysystemmodelbasedonautomaticfuzzyclusteringisproposed.Ahybridmodelidentificationalgorithmisalsodevelopedtodecidethemodelstructureandmodelparameters.Thealgorithmmainlyincludesthreeparts:1)AutomaticfuzzyC-means(AFCM),whichisappliedtogeneratefuzzyrulesautomatically,andthenfixonthesizeoftheneuro-fuzzynetwork,bywhichthecomplexityofsystemdesignisreducesdgreatlyatthepriceofthefittingcapability;2)Recursiveleastsquareestimation(RLSE).ItisusedtoupdatetheparametersofTakagi-Sugenomodel,whichisemployedtodescribethebehaviorofthesystem;3)Gradientdescentalgorithmisalsoproposedforthefuzzyvaluesaccordingtothebackpropagationalgorithmofneuralnetwork.Finally,modelingthedynamicalequationofthetwo-linkmanipulatorwiththeproposedapproachisillustratedtovalidatethefeasibilityofthemethod.
简介:AnewandintelligentdesignmethodforPIDcontrollerwithincompletederivationisproposedbasedontheantsystemalgorithm(ASA).ForagivencontrolsystemwiththiskindofPIDcontroller,agroupofoptimalPIDcontrollerparametersK*p,T*i,andT*dcanbeobtainedbytakingtheovershoot,settlingtime,andsteady-stateerrorofthesystem'sunitstepresponseastheperformanceindexesandbyuseofourimprovedantsystemalgorithm.K*p,T*i,andT*dcanbeusedinreal-timecontrol.ThiskindofcontrolleriscalledtheASA-PIDcontrollerwithincompletederivation.ToverifytheperformanceoftheASA-PIDcontroller,threedifferenttypicaltransferfunctionsweretested,andthreeexistingtypicaltuningmethodsofPIDcontrollerparameters,includingtheZiegler-Nicholsmethod(ZN),thegeneticalgorithm(GA),andthesimulatedannealing(SA),wereadoptedforcomparison.ThesimulationresultsshowedthattheASA-PIDcontrollercanbeusedtocontroldifferentobjectsandhasbetterperformancecomparedwiththeZN-PIDandGA-PIDcontrollers,andcomparableperformancecomparedwiththeSA-PIDcontroller.
简介:ThestatefeedbackdesignforsingularlyperturbedsystemsdescribedinDeltaoperatorisconsidered.Thecompositestatefeedbackcontrollerforslowandfastsubsystemsisdesignedbyusingthedirectmethod.TheobtainedresultscanbringpreviousconclusionsofcontinuousanddiscretetimesystemsintotheunifiedDeltaframework.Asimulationexampleispresentedtodemonstratethevalidityandefficiencyofthedesign.
简介:这份报纸建议一个新奇方法确定为errorsin-的一个名字的规范的正确的图符号(NRGS)的错误与围住的噪音贿赂的变量(EIV)系统。为设置的一个不安模型,的评价跟随一个鉴定框架为估计的名字的NRGS的最坏的v差距错误界限能首先从内在的EIV系统上的priori和一个posteriori信息被决定。然后,一个NRGS不安模型集合能从在二个模型的v差距度量标准和他们的NRGS差别的H-norm之间的一种靠近的关系被导出。获得的NRGS不安模型集合用H为柔韧的控制器设计铺平道路塑造环的方法因为它是著名NCF(规范的coprime因素)的一种标准形式,不安模型设定。最后,数字模拟被用来表明建议鉴定方法的有效性。
简介:一个新奇概率的模糊控制系统被建议在控制协议(TCP)联网的传播对待拥挤回避问题。TCP网络的交通测量上的研究证明了包交通展出称为自我类似的长期的依赖性质,它降级网络表演极大地。概率的模糊控制(陆军)系统被用来在网络系统处理自我类似的交通和当模特儿的不确定性的复杂随机的特征。一三维(3-D)会员功能(MF)在PFC被嵌入表示并且描述网络交通的随机的特征。3-DMF延长了传统模糊平面印射并且进一步提供在“fuzziness-randomness-state”之中的空间印射。3-DMF的另外的随机的表示提供PFC处理自我类似的交通的随机的特征的另外的自由。模拟实验证明建议控制方法在随机的环境与传统的控制计划相比完成优异性能。
简介:Thispaperproposesadecentralizedoutputfeedbackcontrolschemeappliedtotwo-areainterconnectedpowersystem.ThecontrollersynthesisproblemisformulatedasthescaledH∞controlproblemandanewLMI-basedalgorithmisproposedtocomputethedecentralizedcontroller.TheproposedcontrollerprovidesrobustnesswithregardtoparametricuncertaintiesandalsoattenuatesboundedexogenousdisturbancesinthesenseofL2-gain.Simulationresultsclearlyshowtheeffectivenessofdevelopeddecentralizedoutputfeedbackcontrolscheme.
简介:Inthispaper,thestabilizationproblemforaclassofnetworkedcontrolsystems(NCSs)withdatapacketdropoutsandtransmissiontimedelaysisconsidered,wherethedelaysaretime-varyinganduncertain,thedatapacketdropoutismodeledasatwo-stateMarkovchain.Tocompensatethelostpacket,adatapacketdropoutcompensatorisestablished.ThusamorerealisticmodelforsuchNCSsispresented.Sufficientconditionsforthestabilizationofthenewresultingsystemarederivedintheformoflinearmatrixinequalities(LMIs).Numericalexampleillustratesthesolvabilityandeffectivenessoftheresults.