简介:交换非线性的系统的一个类的稳定在纸被调查。担心的系统具有(概括)交换了Byrnes-Isidori正规形式,它都交换了模型在(概括)Byrnes-Isidori正规形式。首先,交换系统的稳定性结果被获得。然后,解决交换非线性的控制系统的稳定问题被用来。另外,必要;足够的条件为是等价于的反馈的一个交换仿射的非线性的系统被获得(概括)交换Byrnes-Isidori正规系统被介绍。最后,作为一个应用程序,交换lorenz系统的稳定性被调查。
简介:Acompoundneuralnetworkisutilizedtoidentifythedynamicnonlinearsystem.Thisnetworkiscomposedoftwoparts:oneisalinearneuralnetwork,andtheotherisarecurrentneuralnetwork.Basedontheinversetheoryacompoundinversecontrolmethodisproposed.Thecontrollerhasalsotwoparts:alinearcontrollerandanonlinearneuralnetworkcontroller.Thestabilityconditionoftheclosed-loopneuralnetwork-basedcompoundinversecontrolsystemisdemonstratedbasedontheLyapunovtheory.Simulationstudieshaveshownthatthisschemeissimpleandhasgoodcontrolaccuracyandrobustness.
简介:Non-intrusivemethodsforeyetrackingareimportantformanyapplicationsofvision-basedhumancomputerinteraction.However,duetothehighnonlinearityofeyemotion,howtoensuretherobustnessofexternalinterferenceandaccuracyofeyetrackingposetheprimaryobstacletotheintegrationofeyemovementsintotoday'sinterfaces.Inthispaper,wepresentastrongtrackingunscentedKalmanfilter(ST-UKF)algorithm,aimingtoovercomethedifficultyinnonlineareyetracking.IntheproposedST-UKF,theSuboptimalfadingfactorofstrongtrackingfilteringisintroducedtoimproverobustnessandaccuracyofeyetracking.ComparedwiththerelatedKalmanfilterforeyetracking,theproposedST-UKFhaspotentialadvantagesinrobustnessandtrackingaccuracy.Thelastexperimentalresultsshowthevalidityofourmethodforeyetrackingunderrealisticconditions.
简介:Focusislaidontheadaptivepracticaloutput-trackingproblemofaclassofnonlinearsystemswithhigh-orderlower-triangularstructureanduncontrollableunstablelinearization.Usingthemodifiedadaptiveadditionofapowerintegratortechniqueasabasictool,anewsmoothadaptivestatefeedbackcontrollerisdesigned.Thiscontrollercanensureallsignalsoftheclosed-loopsystemsaregloballyboundedandoutputtrackingerrorisarbitrarysmall.
简介:Inthispaper,nonlinearobserversareincorporatedintotheadaptivecontroltosynthesizecontrollersforaclassofuncertainnonlinearsystemswithunknownsinusoidaldisturbanceswhicharepresentedinmatchedandunmatchedforms.Inadditiontomagnitudesandphases,frequenciesofthesinusoidaldisturbancesneednotbeknownaswell,solongastheoverallorderisknown.Nonlinearobserversareconstructedtoeliminatetheeffectofunknownsinusoidaldisturbancestoimprovethesteady-stateoutputtrackingperformance-asymptoticoutputtrackingisachieved.Theadaptationlawisusedtoobtaintheestimateofallunknownparameters.Thepresenteddisturbancedecouplingalgorithmscandealwithmatchedandunmatchedunknownsinusoidaldisturbances.
简介:Adissipative-basedadaptiveneuralcontrolschemewasdevelopedforaclassofnonlinearuncertainsystemswithunknownnonlinearitiesthatmightnotbelinearlyparameterized.Themajoradvantageofthepresentworkwastorelaxtherequirementofmatchingcondition,I.e.,theunknownnonlinearitiesappearonthesameequationasthecontrolinputinastate-spacerepresentation,whichwasrequiredinmostoftheavailableneuralnetworkcontrollers.Bysynthesizingastate-feedbackneuralcontrollertonaketheclosed-loopsystemdissipativewithrespecttoaquadraticsupplyrate,thedevelopedcontrolschemeguaranteesthattheL2-gainofcontrolledsystemwaslessthanorequaltoaprescribedlevel.Andthen,itisshownthattheoutputtrackingerrorisuniformlyultimatebounded.Thedesignschemeisillustratedusinganumericalsimulation.
简介:在这篇论文,我们为冲动的控制系统以二项措施学习稳定性和围住的海角。由使用变化Lyapunov方法,稳定性和围住的海角上的一个新变化比较原则和一些标准被获得。一个例子被举说明建议结果的效率。
简介:为有未知结构的非线性的系统的一个系统鉴定方法用短输入产量数据被介绍。方法简化原来的NARMAX方法。它为非线性的系统介绍更一般的模型结构。方法被采用获得模型术语的数据处理的组方法(GMDH);参数。建议方法的有效性被一个典型非线性的系统与未知结构说明;缺乏的输入产量数据。
简介:ThisworkisaimedtorigorouslymanagevoltagesaturationandmaximumcurrentconstraintsinShuntActiveFilters.Inthisrespect,assuming'unconstrained'controlalgorithmshavealreadybeendefinedtoachievestandardobjectivesforsuchdevices(i.e.currenttrackingforharmoniccompensationandDC-busvoltageboundness),aplug-inunit,orientedtoextendthesystemoperatingregionandatthesametimepreservinggoodperformanceunderlargetransientsandoverloadconditions,ispresented.Thissolutionallowstoimproveavailability,robustnessandcomposabilityofShuntActiveFilters,whichareexpectedtobekeyfeaturesinpresentandnextgenerationcomplexandpossibly'smart'powergrids.Theproposedunitiscomposedbytwoparts.First,asuitableanti-windupstrategyisdefinedinordertodealwithcontrolinputsaturation.Itsmainpurposeistopreservetheoriginal'unconstrainederrordynamics',infaceofinputsaturation,whileguaranteeinglowcomputationalburdenandreducedperformanceimpairment(thelattergoal,inharmoniccompensationcontext,leadstorathernon-standardproblemformulation).Tothisaim,theanti-windupactsonthecurrentreferencesthroughasuitably-designedadditionaldynamics.Then,inordertocopewithcurrentlimitations,anadditionalstrategyhasbeendesigned;againthecurrentreferencesissuitablyshapedtocomplywiththefeaturesandboundsofthesystem,augmentedwiththeabove-mentionedanti-windupsolution.TheproposedschemecanbesimplyjoinedtoanykindofunconstrainedcontrolleradoptedtosteerShuntActiveFilters.Inthiswork,anInternal-Model-basedcurrentcontrollerisadoptedasabenchmarkcase.Theproposedapproachisvalidatethroughextensivesimulationtests.