简介:这份报纸与滑动模式控制进L1的集成论述一个适应控制计划适应控制建筑学,它提供好追踪表演以及坚韧性againstmatched无常。Slidingmode控制在L1被用作一条适应法律适应控制建筑学,它被看作在估计的状态和真实状态之间的错误动力学的虚拟控制。当维持控制精确性时,在控制法律设计的低通行证的过滤机制在适应法律阻止一个不连续的信号出现在实际控制信号。由把滑动模式控制用作错误动力学的虚拟控制并且介绍低通行证的过滤控制信号,啁啾的效果被消除。在靠近环的适应系统和靠近环的参考书系统之间的性能界限在这份报纸被描绘。数字模拟被提供表明介绍适应控制计划的表演。
简介:Anewquantitativeconceptisintroducedinthispaper,whichmaybeusedtofacilitatethemeasurementofthecontrollabilityofasubspace~subspacecontrollabilitydegree.Thentheconcreteformofthesubspacecontrollabilitydegreeofaflexiblestructureisderived,andtheerrorsofsubspacecontrollabilitydegreeanddynamicalresponsecausedbythesubstitutionofarepeatedmodesubspaceforacloselyspacedmodesubspacearediscussed.Alltheresultsshowthatthissubstitutionisrationalundersomeconditions.
简介:Asimplifiedmodalmethodtoexplaintheresonancephenomenoninguidedmoderesonance(GMR)gratingswithasymmetriccoatingsispresented.Theresonanceobservedisduetotheinteractionoftwopropagationmodesinsidethegrating.Thereflectivityspectraandelectricfielddistributionscalculatedfromthesimplifiedmodalmethodarecomparedusingrigorouscoupled-waveanalysis(RCWA).Theinfluencesofhigh-orderevanescentmodesontheresonancepeakareanalyzed.AmatrixFabry-Perot(FP)resonanceconditionisdevelopedtoevaluatetheresonancewavelength.AnexplanationfortheresonancephenomenonobservedbasedontheFPresonancephaseconditionisalsoproposedanddemonstrated.ThesimplifiedmethodprovidesclearphysicalinsightsintoGMRgratingsthatareusefulfortheanalysisofavarietyofotherresonancegratings.
简介:Threekeyfactorsarediscussed,whichaffectpositioningaccuracyofrange-rangepositioningmodeandhyperbolicpositioningmode.Basedontheerrorellipticaltheory,theexpressionsofpositioningerrorandofpositioninggeometricfactorofrange-rangepositioningmodeandhyperbolicpositioningmodearederived,andthepositioningerrorandtheblindpositioningareaoftwodifferentpositioningmodesareanalyzed.Accordingtotherequirementofnavigationarea,anoptimumpositional
简介:Powersystemhasitsindustrialstructurefeaturingbothnaturalmonopolyandcompetition,makingderegulationandre-regulationbecomethemainmelodyintheevolutionoftheregulatorysystemforpowerindustry.Consequently,itisoneofthemaintasksforpowerreformtodetermineanewandrationalregulatorymode.
简介:Wedemonstrateanall-fiberhigh-powerYb-doped1018nmfiberlaserwithaGaussian-shapedoutputbeamprofilebasedonamismatchedstructure,whichconsistsofapairofsingle-modefiberBragggratingsandasectionoffew-modedouble-claddinggainfiber.Theoutputpowerisupto107.5Wwithanoptical-to-opticalefficiencyof63%,andthe3dBbandis0.26nmatthispowerlevel.Suchastructureofsingle-mode–few-mode–single-modefiberoscillatorcanbeusedtogeneratehigh-powernarrow-linewidthlasingwithexcellentbeamqualityinotherspectralranges.
简介:ThispaperanalyzesthecharacteristicofmatchingeffciencybetweenthefundamentalmodeoftwokindsofopticalwaveguidesanditsGaussianapproximatefield.Then,itpresentsanewmethodwherethemode-fieldhalf-widthofGaussianapproximationforthefundamentalmodeshouldbedefinedaccordingtothemaximalmatchingeffciencymethod.Therelationshipbetweenthemode-fieldhalf-widthoftheGaussianapproximatefieldobtainedfromthemaximalmatchingeffciencyandnormalizedfrequencyisstudied;furthermore,twoformulasofmode-fieldhalf-widthsasafunctionofnormalizedfrequencyareproposed.
简介:Weproposeahighsensitivitysensorbasedonamodenumber-encodedmulti-longitudinalmodefiberlaser.ThefiberlaserincorporatesauniformfiberBragggrating(FBG)andafiberFabry-Perotinterferometer(FFPI)assensitivecomponentsinthecavity.Thesensorcountsthenumberoflongitudinalmodes(NLM)offiberlaser,whichiscausedbythemismatchbetweenthereflectionbandofFBGandthetransmissionbandofFFPIresultingfromtheapplicationofexternalperturbationtotheFBG.AnelectricalspectrumanalyzerisadoptedtoanalyzetheNLM.Thestrainsensorisexperimentallydemonstratedtohavesensitivityofashighas0.02με/mode.
简介:Withtherapidprogressofcomponenttechnology,thesoftwaredevelopmentmethodologyofgatheringalargenumberofcomponentsfordesigningcomplexsoftwaresystemshasmatured.But,howtoassesstheapplicationreliabilityaccuratelywiththeinformationofsystemarchitectureandthecomponentsreliabilitiestogetherhasbecomeaknottyproblem.Inthispaper,thedefectsinformaldescriptionofsoftwarearchitectureandthelimitationsinexistedmodelassumptionsarebothanalyzed.Moreover,anewsoftwarereliabilitymodelcalledComponentInteractionMode(CIM)isproposed.Withthismodel,theproblemforexistedcomponent-basedsoftwarereliabilityanalysismodelsthatcannotdealwiththecasesofcomponentinteractionwithnon-failureindependentandnon-randomcontroltransitionisresolved.Atlast,thepracticeexamplesarepresentedtoillustratetheeffectivenessofthismodel.
简介:Byusingthemethodofstressfunctions,theproblemofmode-ⅡGriffithcrackindecagonalquasicrystalswassolved.First,thecrackproblemoftwo-dimensionalquasicrystalswasdecomposedintoaplanestrainstateproblemsuperposedonanti-planestateproblemandsecondly,byintroducingstressfunctions,the18basicelasticityequationsoncouplingphonon-phasonfieldofdecagonalquasicrystalswerereducedtoasinglehigherorderpartialdifferentialequations.Thesolutionofthisequationundermixedboundaryconditionsofmode-ⅡGriffithcrackwasobtainedintermsofFouriertransformanddualintegralequationsmethods.Allcomponentsofstressesanddisplacementscanbeexpressedbyelementalfunctionsandthestressintensityfactorandthestrainenergyreleaserateweredetermined.