简介:Anewalgorithmforthestabilizationof(possiblyturbulent,chaotic)distributedsystems,governedbylinearornonlinearsystemsofequationsispresented.TheSPA(StabilizationParallelAlgorithm)isbasedonasystematicparalleldecompositionoftheproblem(relatedtoarbitrarilyoverlappingdecompositionofdomains)andonapenaltyargument.SPAispresentedhereforthecaseoflinearparabolicequations:withdistrjbutedorboundarycontrol.Itextendstopracticallyalllinearandnonlinearevolutionequations,asitwillbepresentedinseveralotherpublications.
简介:Lu:Goodmorningfellows.Whenweforetoldtheworldtrendsin2004ayearago,weusedthestockmarketterm"marketcorrectionandreshaping."Theoverallsituationoflastyearturnedouttobeexactlywhatwepredicted:correctionsfollowedturbulences,justlikedownstreammildflowscomingoutofupstreamtorrents;amongthegeneralstabilitywastherestilllocalturmoil.
简介:Basedonthenotionofmaximalabsoluteobservabilityanditsnormalforms,anewmethodforstudyingthelocalstabilizationforakindofnonlinearcontrolsystemsisestablished.DifferentfromthepreviousresultsgivenbyByrnes-Isitoriandothers,thisnewmethodcandealwithmoregeneralsystems,andhasmuchsimplerwaytoprovethestabilizationconditionsandtodesignthefeedbacklaws.
简介:Thispaperdiscussestherobustquadraticstabilizationcontrolproblemforstochasticuncertainsystems,wheretheuncertainmatrixisnormbounded,andtheexternaldisturbanceisastochasticprocess.Twokindsofcontrollersaredesigned,whichincludestatefeedbackcaseandoutputfeedbackcase.Theconditionsfortherobustquadraticstabilizationofstochasticuncertainsystemsaregivenvialinearmatrixinequalities.Thedetaileddesignmethodsarepresented.Numericalexamplesshowtheeffectivenessofourresults.
简介:这份报纸学习在一个空间领域上演变的一个分布式的双线性的系统的地区性的稳定。为地区性的弱、强壮、指数的稳定的足够的条件被给。另外,我们讨论一个地区性的最佳的稳定问题。获得的结果被例子和模拟说明。
简介:Inthispaperweshowthcmethodofenergyinpartwithwhichwecangetthemodelofrandomwave,andpredicttherollmotionofunstabilizedshipandstabilizedshipusingthewavemodel.Thecontrolparametersoffinstabilizeraredeterminedaccordingtotheperformanceindex.Thesimulationofthesystemisalsomadeinthispaper.Thecomparisonofthesimulationwithrealshipindicatesthatthemethodcanbeusedinthepredictionofrollmotionofastabilizedshipinrandomwave.
简介:Withtheincreasingimportanceofoceanexploitation,providinganti-rollingstabilityforshipsatanchorhasbecomemoreandmoreimportant.Thelift-generationtheoryoftraditionalfinstabilizersisbasedonincomingflowvelocity,whichisnotsuitableforexplainingliftgeneratedatanchor.Weanalyzednon-steadyflows,withforcesonfinstabilizersgeneratedbynon-incomingflowvelocityconditions,andgaveanewlift-generationmodel.Thecorrectnessofthemodelwasprovenbycomparingexperimentalresultsoffinstabilizermotionundernon-incomingvelocityconditionsfromthefluidcomputationsoftwarewiththatfromtheemulatorofthelift-generationmodel.Finally,themodelwasusedinananti-rollingsystemonashipandthereductionofrollwasmuchbetterthanwhatcouldbeachievedbypassiveanti-rollingtanks.
简介:Inthispaper,theboundarystabiligstionoftbeTimoshenkoequationofanononiformbeam,withclarrmpedboundaryconditionatoneendandwitbbendingmomentandshearforcecontrolsattheotherend,isconsidered.Itisprovedthatthesystemisexponentiallystahilizablewhenthebendingmomentandshearforcecontrolsaresimultaneouslyappiied.Thefrequencydomainmethodandthemultipliertechniqueareused.
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:Inthispaper,thestabilizationproblemofnonuniformTimoshenkobeambysomenonlinearboundaryfeedbackcontrolsisconsidered.Byvirtueofnonlinearsemigrouptheory,energy-perturbedapproachandexponentialmultipliermethod,itisshownthatthevibrationofthebeamundertheproposedcontrolactiondecaysexponentiallyorinnegativepoweroftimetast→∞.
简介:ThestabilizationproblemofanonuniformTimoshenkobeamsystemWithcoupledlocallydistributedfeedbackcontrolsisstudied.First,byprovingtheuniquenessofthesolutiontotherelatedordinarydifferentialequations,weestablishtheasymptoticdecayoftheenergycorrespondingtotheclosedloopsystem.Then,byvirtueofpiecewisemultipliermethod,weprovetheexponentialdecayoftheclosedloopsystem.
简介:Theproblemofstabilizingmultipleindependentlinearsystemssharingonecommonnetworkcableispresentedandsolved.Boththequantizationandtimesequencingarestudiedinthefieldofcontrolovernetworksbyprovidingtheformulatedstabilizingsufficientconditionwhichillustratestherelationshipbetweenthesysteminstability,quantizationandtimesequencing,andthedatarateisalsopresentedintermsofthequantizationandtimesequencing.Anumericalexampleisgiventoillustratetheresult.
简介:Toimprovethefrequencystabilizationoflaserdiodeinthelaserfrequencyscannedinterferometricmetrology,amodifiedmethodisproposedbyusingafiberringresonator.Thetheoreticalanalysisofthismodifiedmethodisperformed.Moreover,thePound-Drever-Hall(PDH)techniqueisemployedtoobtainthefrequencydiscriminationcurveofafiberringresonator,whosefinesseis1260andline-widthis270kHz.Thesimulatedresultsshowthatthecurvehasasteepslopeneartheresonantfrequency,whichprovesthesensitivityofthissystemtothefrequencydeviation,sothemodifiedmethodhasgreatpotentialforthefrequencystabilizationofalaserdiode.
简介:TheboundarystabilizationproblemofaTimoshenkobeamattachedwithamassatoneendisstudied.First,withlinearboundaryforcefeedbackandmomentcontrolsimultaneouslyattheendattachedwiththeload,theenergycorrespondingtotheclosedloopsystemisproventobeexponentiallyconvergenttozeroastimet--oo.Then,somecounterexamplesaregiventoshowthat,inothercases,thecorrespondingclosedloopsystemis,ingeneral,notstableasymtotically,letaloneexponentially.
简介:LetMbeacompactorientable3-manifoldwithMconnected.IfV∪SWisaHeegaardsplittingofMwithdistanceatleast6,thenthe-stabilizationofV∪SWalongMisunstabilized.HenceMhasatleasttwounstabilizedHeegaardsplittingswithdifferentgenera.ThebasictoolisaresultondiskcomplexgivenbyMasurandSchleimer.