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82 个结果
  • 简介:Anewalgorithmforthestabilizationof(possiblyturbulent,chaotic)distributedsystems,governedbylinearornonlinearsystemsofequationsispresented.TheSPA(StabilizationParallelAlgorithm)isbasedonasystematicparalleldecompositionoftheproblem(relatedtoarbitrarilyoverlappingdecompositionofdomains)andonapenaltyargument.SPAispresentedhereforthecaseoflinearparabolicequations:withdistrjbutedorboundarycontrol.Itextendstopracticallyalllinearandnonlinearevolutionequations,asitwillbepresentedinseveralotherpublications.

  • 标签: 平行稳定性 运算法则 线性抛物线方程 分布系统
  • 简介:Lu:Goodmorningfellows.Whenweforetoldtheworldtrendsin2004ayearago,weusedthestockmarketterm"marketcorrectionandreshaping."Theoverallsituationoflastyearturnedouttobeexactlywhatwepredicted:correctionsfollowedturbulences,justlikedownstreammildflowscomingoutofupstreamtorrents;amongthegeneralstabilitywastherestilllocalturmoil.

  • 标签: 国际形势 国际政治秩序 欧盟 美国 外交关系 俄罗斯
  • 简介:Basedonthenotionofmaximalabsoluteobservabilityanditsnormalforms,anewmethodforstudyingthelocalstabilizationforakindofnonlinearcontrolsystemsisestablished.DifferentfromthepreviousresultsgivenbyByrnes-Isitoriandothers,thisnewmethodcandealwithmoregeneralsystems,andhasmuchsimplerwaytoprovethestabilizationconditionsandtodesignthefeedbacklaws.

  • 标签: Nonlinear control ABSOLUTE OBSERVABILITY ZERO DYNAMICS
  • 简介:Thispaperdiscussestherobustquadraticstabilizationcontrolproblemforstochasticuncertainsystems,wheretheuncertainmatrixisnormbounded,andtheexternaldisturbanceisastochasticprocess.Twokindsofcontrollersaredesigned,whichincludestatefeedbackcaseandoutputfeedbackcase.Theconditionsfortherobustquadraticstabilizationofstochasticuncertainsystemsaregivenvialinearmatrixinequalities.Thedetaileddesignmethodsarepresented.Numericalexamplesshowtheeffectivenessofourresults.

  • 标签: 随机系统 二次方程 鲁棒控制 动态反馈 WIENER过程 稳定性
  • 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。

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  • 简介:Inthispaperweshowthcmethodofenergyinpartwithwhichwecangetthemodelofrandomwave,andpredicttherollmotionofunstabilizedshipandstabilizedshipusingthewavemodel.Thecontrolparametersoffinstabilizeraredeterminedaccordingtotheperformanceindex.Thesimulationofthesystemisalsomadeinthispaper.Thecomparisonofthesimulationwithrealshipindicatesthatthemethodcanbeusedinthepredictionofrollmotionofastabilizedshipinrandomwave.

  • 标签: wave model energy in part ROLL
  • 简介:Withtheincreasingimportanceofoceanexploitation,providinganti-rollingstabilityforshipsatanchorhasbecomemoreandmoreimportant.Thelift-generationtheoryoftraditionalfinstabilizersisbasedonincomingflowvelocity,whichisnotsuitableforexplainingliftgeneratedatanchor.Weanalyzednon-steadyflows,withforcesonfinstabilizersgeneratedbynon-incomingflowvelocityconditions,andgaveanewlift-generationmodel.Thecorrectnessofthemodelwasprovenbycomparingexperimentalresultsoffinstabilizermotionundernon-incomingvelocityconditionsfromthefluidcomputationsoftwarewiththatfromtheemulatorofthelift-generationmodel.Finally,themodelwasusedinananti-rollingsystemonashipandthereductionofrollwasmuchbetterthanwhatcouldbeachievedbypassiveanti-rollingtanks.

  • 标签: 轮船 抛锚 反向旋转 模拟
  • 简介:Inthispaper,theboundarystabiligstionoftbeTimoshenkoequationofanononiformbeam,withclarrmpedboundaryconditionatoneendandwitbbendingmomentandshearforcecontrolsattheotherend,isconsidered.Itisprovedthatthesystemisexponentiallystahilizablewhenthebendingmomentandshearforcecontrolsaresimultaneouslyappiied.Thefrequencydomainmethodandthemultipliertechniqueareused.

  • 标签: 边界稳定性 不对称性 Timoshenko方程 波束
  • 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。

  • 标签: 非线性转换系统 稳定性 规范模式 LYAPUNOV函数
  • 简介:Theauthorstudiesthestabilizationfortheunitarygroupsoverpolynomialringsandobtainsforthernsomeresultsanalogonstotheresultsoflineargroupsandsymplecticgroups,ItisespeciallyprovedthatK1U(A)=K1U(R)whereA=R[X1,…Xm],RisaringofalgebraicintegersinaquadraticfieldQ(√d).

  • 标签: 稳定定理 酉群 多项式环 最大理想
  • 简介:有抑制输入(SLSCI)的交换线性系统的稳定被考虑。作者设计可被考虑的线性州的反馈和有一最小的居住时间(MDT)到的切换的规则稳定了系统。首先为有抑制输入的每个分系统,稳定线性州的反馈和靠近环的系统的一个不变的集合同时被构造,以便如果这设定并且仅当靠近环的系统状态在内躺着,输入限制满足。由为每个靠近环的分系统构造一个二次的Lyapunov函数,然后,MDT被推出,基于MDT的切换策略被介绍保证交换系统的稳定性。

  • 标签: 线性切换系统 约束输入 线性状态反馈 LYAPUNOV 镇定 稳定系统
  • 简介:ThestabilizationproblemofanonuniformTimoshenkobeamsystemWithcoupledlocallydistributedfeedbackcontrolsisstudied.First,byprovingtheuniquenessofthesolutiontotherelatedordinarydifferentialequations,weestablishtheasymptoticdecayoftheenergycorrespondingtotheclosedloopsystem.Then,byvirtueofpiecewisemultipliermethod,weprovetheexponentialdecayoftheclosedloopsystem.

  • 标签: 局部分布反馈控制 Timoshenko转播 CO半群 稳定性 分段乘法器
  • 简介:一条交换系统途径被建议与通讯限制为联网的控制系统(NCS)建模。这使我们能把交换系统的富有的理论用于分析如此的NCS。足够的条件在NCS的稳定上被介绍。稳定状态/产量的反馈控制器能被使用一些线性矩阵不平等(LMI)的可行答案构造。我们的建议途径的优点是NCS的行为能被没有扩充系统,考虑交换了系统学习。一个模拟例子被得出说明建议途径的有效性。

  • 标签: 网络控制系统 转换系统 稳定性 LMIS 有限带宽
  • 简介:Theproblemofstabilizingmultipleindependentlinearsystemssharingonecommonnetworkcableispresentedandsolved.Boththequantizationandtimesequencingarestudiedinthefieldofcontrolovernetworksbyprovidingtheformulatedstabilizingsufficientconditionwhichillustratestherelationshipbetweenthesysteminstability,quantizationandtimesequencing,andthedatarateisalsopresentedintermsofthequantizationandtimesequencing.Anumericalexampleisgiventoillustratetheresult.

  • 标签: 稳定性 量子化 时间分序 独立线性系统 控制网络
  • 简介:Toimprovethefrequencystabilizationoflaserdiodeinthelaserfrequencyscannedinterferometricmetrology,amodifiedmethodisproposedbyusingafiberringresonator.Thetheoreticalanalysisofthismodifiedmethodisperformed.Moreover,thePound-Drever-Hall(PDH)techniqueisemployedtoobtainthefrequencydiscriminationcurveofafiberringresonator,whosefinesseis1260andline-widthis270kHz.Thesimulatedresultsshowthatthecurvehasasteepslopeneartheresonantfrequency,whichprovesthesensitivityofthissystemtothefrequencydeviation,sothemodifiedmethodhasgreatpotentialforthefrequencystabilizationofalaserdiode.

  • 标签: 环形谐振器 激光二极管 频率稳定 光纤 半导体激光器 干涉计量
  • 简介:TheboundarystabilizationproblemofaTimoshenkobeamattachedwithamassatoneendisstudied.First,withlinearboundaryforcefeedbackandmomentcontrolsimultaneouslyattheendattachedwiththeload,theenergycorrespondingtotheclosedloopsystemisproventobeexponentiallyconvergenttozeroastimet--oo.Then,somecounterexamplesaregiventoshowthat,inothercases,thecorrespondingclosedloopsystemis,ingeneral,notstableasymtotically,letaloneexponentially.

  • 标签: 边界反馈稳定性 乘子法 闭环系统 timoshemko束 指数稳定性 半群
  • 简介:为有非线性的不明确的联网的控制系统(NCS)的一个类的柔韧的稳定的问题令人满意一个给定的扇区条件在这篇论文被调查。由在传播与参数不确定性,导致网络的延期,非线性和数据包退学学生介绍NCS的一个新模型,一个严格的线性矩阵不平等(LMI)标准基于Lyapunov稳定性理论为不明确的非线性的NCS的柔韧的稳定被建议。最大的许可的转移间隔(MATI)能被解决相应LMI的可行性问题导出。一些数字例子被提供表明建议算法的适用性。

  • 标签: 网络控制系统 鲁棒控制 非线性控制 LMI
  • 简介:LetMbeacompactorientable3-manifoldwithMconnected.IfV∪SWisaHeegaardsplittingofMwithdistanceatleast6,thenthe-stabilizationofV∪SWalongMisunstabilized.HenceMhasatleasttwounstabilizedHeegaardsplittingswithdifferentgenera.ThebasictoolisaresultondiskcomplexgivenbyMasurandSchleimer.

  • 标签: 不稳定 距离 劈裂 Heegaard分裂 镇定 络合物