简介：Controlofsupersonicflowfieldswithshockwaveisimportantforsomeindustrialfields.Therearemanystudiesforcontrolofthesupersonicflowfieldsusingactiveorpassivecontrol.Whennon-equilibriumcondensationoccursinasupersonicflowfield,theflowisaffectedbylatentheatreleased.Manystudiesforthecondensationhavebeenconductedandthecharacteristicshavebeenalmostclarified.Further,itwasfoundthatnon-equilibriumcondensationcancontroltheflowfield.Inthesestudies,thecondensationoccursacrossthepassageoftheflowfieldanditcausesthetotalpressurelossintheflowfield.However,localoccurrenceofnon-equilibriumcondensationintheflowfieldmaychangethecharacteristicsoftotalpressurelosscomparedwiththatbythecondensationacrossthepassageofthenozzleandtherearefewforresearchesoflocallyoccurrednon-equilibriumcondensationinsupersonicflowfield.Thepurposeinthepresentstudyistoclarifytheeffectoflocaloccurrenceofnon-equilibriumcondensationonthetransonicflowfieldinanozzlewithacircularbump.Asaresult,localoccurrenceofnon-equilibriumcondensationreducedtheshockstrengthandtotalpressurelossinthetransonicflowfieldbyflowingthemoistairfromtrailingedgeofthecircularbumptothemainstream.

简介：Thechargingcharacteristicsofthevalve-regulatedleadacid(VRLA)batterydrivenbysolarenergywereexperimentallystudiedthroughthepressure-controlmethodinthispaper.Theaimsoftheresearchweretoincreasechargingefficiencytomakethemostofsolarenergyandtoimprovechargingqualitytoprolonglifeofbattery.Thechargingprocessofa12V12A·hVRLAbatteryhasbeentestedunderthemodeofastand-alonephotovoltaic(PV)system.Resultsshowthatthepressure-controlmethodcaneffectivelycontrolPVchargingoftheVRLAbatteryandmakethebestofPVcellsthroughthemaximumpowerpointtracking(MPPT).ThedamageofVRLAbatterybyexcessoxygenaccumulationcanbeavoidedthroughtheinnerpressurecontrolofVRLAbattery.Parameterssuchassolarradiationintensity,chargingpower,innerpressureofthebattery,andchargingcurrentandvoltageduringthechargingprocessweremeasuredandanalyzed.

简介：Atheoreticalmodelingapproachaswellasanunsteadyanalyticalmethodisusedtostudyaerodynamiccharacteristicsofwingflappingwithasymmetricstroke-cyclesinconnectionwithanobliquestrokeplaneduringinsectforwardflight.Itisrevealedthattheaerodynamicasymmetrybetweenthedownstrokeandtheupstrokeduetostroke-asymmetricalflappingisakeytounderstandtheflowphysicsofgenerationandmodulationoftheliftandthethrust.Predictedresultsforexamplesofgivenkinematicsvalidatemorespecificallysomeviewpointsthatthewingliftismoreeasilyproducedwhentheforwardspeedishigherandthethrustisharder,andtheliftandthethrustaregeneratedmainlyduringdownstrokeandupstroke,respectively.Theeffectsofthreecontrollingparameters,i.e.theanglesoftiltedstrokeplane,thedifferentdownstrokedurationratios,andthedifferentanglesofattackinbothdown-andup-stroke,arefurtherdiscussed.Itisfoundthatlargerobliqueanglesofstrokeplanesgeneratelargerthrustbutsmallerlift;largerdownstrokedurationratiosleadtolargerthrust,whilemakinglittlechangeinliftandinputaerodynamicpower;andagain,asmallincreaseoftheangleofattackindownstrokeorupstrokemaycauseremarkablechangesinaerodynamicperformanceintherelevantstroke.

简介：AsoneofthekeyunitsofspaceCCDcamera,thetemperaturerangeandstabilityofCCDcomponentsaffecttheimage’sindexes.Reasonablethermaldesignandrobustthermalcontroldevicesareneeded.Onekindoftemperaturecontrolloopheatpipe(TCLHP)isdesigned,whichhighlymeetsthethermalcontrolrequirementsofCCDcomponents.InordertostudythedynamicbehaviorsofheatandmasstransferofTCLHP,particularlyintheorbitalflightcase,atransientnumericalmodelisdevelopedbyusingthewell-establishedempiricalcorrelationsforflowmodelswithinthreedimensionalthermalmodeling.Thetemperaturecontrolprincipleanddetailsofmathematicalmodelarepresented.Themodelisusedtostudyoperatingstate,flowandheatcharacteristicsbasedupontheanalysesofvariationsoftemperature,pressureandqualityunderdifferentoperatingmodesandexternalheatfluxvariations.TheresultsindicatethatTCLHPcansatisfythethermalcontrolrequirementsofCCDcomponentswell,andalwaysensuregoodtemperaturestabilityanduniformity.Bycomparisonbetweenflightdataandsimulatedresults,itisfoundthatthemodelistobeaccuratetowithin1℃.ThemodelcanbebetterusedforpredictingandunderstandingthetransientperformanceofTCLHP.

简介：Beamhalo-chaosinhigh-currentacceleratorshasbecomeakeyconcernedissuebecauseitcancauseexcessiveradioactivityfromtheacceleratorsthereforesignificantlylimitstheirapplicationsinindustry,medicine,andnationaldefense.Somegeneralengineeringmethodsforchaoscontrolhavebeendevelopedinrecentyears,buttheygenerallyareunsuccessfulforbeamhalo-chaossuppressionduetomanytechnicalconstraints.Beamhalo-chaosisessentiallyaspatiotemporalchaoticmotionwithinahighpowerprotonaccelerator.Inthispaper,someefficientnonlinearcontrolmethods,includingwaveletfunctionfeedbackcontrolasaspecialnonlinearcontrolmethod,areproposedforcontrollingbeamhalo-chaosunderfivekindsoftheinitialprotonbeamdistributions(i.e.,Kapchinsky-Vladimirsky,fullGauss,3-sigmaGauss,water-bag,andparaboladistributions)respectively.Particles-in-cellsimulationsshowthataftercontrolofbeamhalo-chaos,thebeamhalostrengthfactorisreducedtozero,andotherstatisticalphysicalquantitiesofbeamhalo-chaosaredoublyreduced.Themethodswedevelopedisveryeffectiveforsuppressionofprotonbeamhalo-chaosinaperiodicfocusingchannelofaccelerator.Somepotentialapplicationofthebeamhalo-chaoscontrolinexperimentsisfinallypointedout.

简介：BasedontheFloquettheoryonordinarydifferentialequationswithperiodicallyvariablecoefficientsandthebifurcationapproachtononlinearequations,anumericalapproachtodeterminingthestabilityregionofcontrolparametersisestablishedforadynamiccontrolsystemcomposedofamovingbodylevitatedmagneticallyoverflexibleguideways.Thesystemisnonlinearlycoupledamongtheelasticdeformationofguideways,disturbancethelevitationpositionofthebodyandelectromagneticcontrolforces.Thenumericalsimulationisgivenforthesysteminthecaseinwhichthecontrolparametersaretakenwithinandoutofthestabilityregionrespectively.Resultsshowthatthisapproachisreliable.

简介：一个新方法被开发因为在在同一直线上的振动点上稳定运动用限制的通报的形式主义绕三个身体问题转。关于在同一直线上的振动点轨道的Linearization与周期的系数产出一个不稳定的线性变化参数的系统。给变化方程，一条创新控制法律为振动点轨道基于典型代表赋值被介绍维护。选择理查森鈥檚的数字模拟为一条名字的轨道被进行的一条光圈轨道的第三顺序近似，和结果表明这条控制法律的有效性。关键词通报限制了三个身体问题-变化方程-振动点轨道维护-典型代表赋值工程被中国(10702003)的国家自然科学基础支持。

简介：Magneto-rheologicalvisco-elastomer(MRVE)asanewsmartmaterialdevelopedinrecentyearshasseveralsignificantadvantagesovermagneto-rheologicalliquid.Theadjustabilityofstructuraldynamicstorandomenvironmentalexcitationsisrequiredinvibrationcontrol.MRVEcansupplyconsiderablyadjustabledampingandstiffnessforstructures,andtheadjustmentofdynamicpropertiesisachievedonlybyappliedmagneticfieldswithchangelessstructuredesign.IncreasingresearchesonMRVEdynamicproperties,modeling,andvibrationcontrolapplicationarepresented.RecentadvancesinMRVEdynamicpropertiesandstructuralvibrationcontrolapplicationincludingcompositestructuralvibrationmitigationunderuniformmagneticfields,vibrationresponsecharacteristicsimprovementthroughharmonicparameterdistribution,andoptimalboundedparametriccontroldesignbasedonthedynamicalprogrammingprinciplearereviewed.RelevantmainmethodsandresultsintroducedarebeneficialtounderstandingandresearchesonMRVEapplicationanddevelopment.

简介：TheInternetevolvestoincorporatevery-high-bandwidthopticallinksandmorelarge-delaysatellitelinks.TCPfacesnewchallengesinthisuniqueenvironment.TheoryandexperimentsshowedthatTCPbecomesinefficientandispronetobeunstableastheper-flowproductofbandwidthandlatencyincreases,regardlessofthequeuingscheme.Variable-structurecongestionControlProtocol(VCP)isproposedtoaddresstheseproblems.However,VCPhasproblemintermsofconvergencetime,i.e.,ittakesalongtimeforanewVCPflowtoachievefairbandwidthallocationiftheexistingVCPflowshavelargecon-gestionwindows.ThispaperproposedanExtendedVariable-structurecongestionControlProtocol(EVCP),whichadoptedaconvergencecontroller.Thebasicideaofconvergencecontrolleristhatifaflowhaslargerwindowthanitsfairwindow,itscongestionwindowshouldbedecreasedmoreaggressivelythanusualinMultiplicativeDecrease(MD)phase.SimulationsshowedthatEVCPhasbetterperformanceintermsofconvergencetimewhilekeepingtheadvantagesofVCP.

简介：

简介：我们考虑在基于测量的反馈控制和隧道被考虑的decoherence的二个原型的类下面受到一条噪音隧道的一个开的量系统：阶段抑制并且概括振幅抑制。基于量轨道理论，我们面对反馈控制为减少的系统的动力学获得一个扩大主人方程。为一个qubit系统我们经分解解决这个主人方程并且获得州的向量动力学的解决方案。然后，我们为准备任意的量建议一个有效反馈控制计划纯状态。我们也学习怎么有效地保护二个nonorthogonal状态，并且发现有不偏的基础的射影的测量不为这项任务是最佳的，当有偏导的基础的弱测量能认识到二个nonorthogonal状态的最好的保护时。而且，在反馈过程的无效也被讨论。

简介：Thispaperaddressesamaster-slavesynchronizationstrategyforcomplexdynamicsystemsbasedonfeedbackcontrol.Thisstrategyisappliedto3-DOFplanarmanipulatorsinordertoobtainsynchronizationinsuchcomplicatedaschaoticmotionsofend-effectors.AchaoticcurveisselectedfromDuffingequationasthetrajectoryofmasterend-effectorandapiecewiseapproximationmethodisproposedtoaccuratelyrepresentthischaotictrajectoryofend-effectors.Thedynamicalequationsofmaster-slavemanipulatorswithsynchronizationcontrollerarederived,andtheLyapunovstabilitytheoryisusedtodeterminethestabilityofthiscontrolledsynchronizationsystem.Innumericalexperiments,thesynchronousmotionsofend-effectorsaswellasthreejointanglesandtorquesofmaster-slavemanipulatorsarestudiedunderthecontroloftheproposedsynchronizationstrategy.Itisfoundthatthepositivegainmatrixaffectstheimplementationofsynchronizationcontrolstrategy.Thissynchronizationcontrolstrategyprovesthesynchronization'sfeasibilityandcontrollabilityforcomplicatedmotionsgeneratedbymaster-slavemanipulators.

简介：Theactivecontrolofvibrationforabeamsubjectedtomulti-disturbancesisinvestigatedbasedonwavepropagatingsuppression.Inthiscontrolsystem,therearethesamenumbersofthesensors,thesignalinputtingtothecon-trollerandthedisturbances,butthereisonlyonecontroller.Itisalocalcontrolsystem,thesystemparametersdependonlyonthecharacteristicsofthestructureboundedbythesensorsandthecontroller,andweneednottakeintoaccounttheboundaryconditionsandthepropertiesofstructuresoutsideofthisfield.Thesys-temisefficientwhenastructurevibratesinmiddleandhighfrequencyregions.Somecontroldesignrulesaredevelopedfromthecalculationresults.

简介：Abstract.OnthebasisofclassificationofgeographicalpropertiesarollingdevelopmentgoalprogrammingmodelisformulatedincorrespondencewiththeecopatterngroupinFour-LakeArea.Inthismodel,thecontrolofschistosomiasisandstrengthen-Lugofthedrainage-storagefunctionarebothregardedasecologicalmeasuresduringtheprocessofmulti-year(r0)ecologicaleconomicrollingdevelopmenttomaketheecoagrlculturalsysteminthisareaintoastablyoperating,ordered,andgoodcyclicsystemunderthesupportofsomecontrollablefactors.

简介：在这份报纸，完整的分离本地设计稳定了(LPS)方法被建议与相等的顺序元素解决不稳定的海军司烧方程的最佳的控制问题。对流效果和压力被使用LPS方法两个都稳定。一个priori错误关于雷纳兹一致地估计数字被获得，提供真答案是足够的光滑。数字实验被实现说明并且证实我们的理论分析。

简介：Theoptimalarrangementofviscoelasticdampers(VEDs)usedtolinktwoadjacentshear-typestructuresunderseismicexcitationwasinvestigated.Atwo-stepoptimaldesignmethodisproposed.First,optimalparameterexpressionsoftheKelvinmodelareusedtocalculatetheoptimalstiffnessanddampingcoefficientoftheVEDs.Then,usingthetwo-stepoptimaldesignmethod,takingthequadraticperformanceindexastheoptimizationobjective,theoptimalarrangementofthedampersisdetermined.GeneralrulesabouttheoptimalarrangementoftheVEDswereobtained.Theresultsshowthattheplacementofonlyonedamperbetweentwoadjacentshear-typestructuresshouldbeavoided;ifmorethanonedamperisused,theyshouldbedistributedonthetopandlowerfloorsofthestructures.Optimizationofthenumberofdampershadlittleeffectonresponsereduction.Themostimportantfactorwastheoptimizationoftheplacementofthedampers.Throughcomparativestudy,forbuildingsofequalandunequalheights,theoptimalparametersofdampersfromparametricstudieswereshowntomatchthetheoreticalresultsfordifferentnumbersandplacementsofdampers.Thelevelofresponsereductionwasshowntobesensitivetothedampingcoefficientofthedampers.

简介：TheinverseFaradayeffectinducedinmagneticfilmsbyultrashortlaserpulsesallowsexcitationandcontrolofspinsatgigahertzandsub-terahertzfrequencies.Thefrequencyoftheopticallyexcitedmagnetizationprecessioniseasilytunablebytheexternalmagneticfield.Ontheotherhand,theinitialphaseoftheprecessionmarginallydependsonthemagneticfield.Herewedemonstrateanapproachforthecontroloftheprecessionphasebyvariationofthepumpbeamdirection.Inparticular,weconsiderthecasewhenthemagnetizationprecessionisexcitedbyobliquelyincidentpumppulsesinamagneticdielectricfilmplacedinthein-planemagneticfield.Theoreticalconsiderationpredictsthattheinitialphaseshouldappearforanon-zeroin-planecomponentofthepumpwavevectororthogonaltotheexternalmagneticfield.Experimentalstudiesconfirmthisconclusionandrevealthatthephasegrowswithincreaseofthein-planewavevectorcomponent.Variationofphaseby15degisdemonstrated.Potentially,thephasecouldbechangedevenmorepronouncedlybymorethan90deg.Thisworkprovidesasimplewayforadditionalmanipulationwithopticallyexcitedmagnetizationdynamics,whichisofimportancefordifferentspintronicapplications.

简介：传统的被动吸收器在一个狭窄、肯定的频率乐队以内是充分有效的。解决这个问题，推迟时间的加速反馈被介绍把一个被动吸收器变换成活跃的。两固有并且故意的时间延期被包括。前者主要来自信号获得并且处理，计算，并且适用使活动力量，和它的值被修理。后者在控制器被介绍，并且它的价值是活跃地可调节的。第一，机械模型被建立，频率反应方程被获得。稳定性的区域在控制参数的飞机被描出。第二，控制帕拉的设计计划--米被执行帮助选择反馈获得和时间延期的值。第三，试验性的研究被进行。否定、积极的反馈控制的效果被调查。试验性的结果证明控制参数的合适的选择可以拓宽颤动吸收的有效频率乐队。而且，当被动吸收器完全失败时，推迟时间的吸收器极大地压制主要系统的反响的反应。试验性的结果在对理论预言和数字模拟的好同意。

简介：在这篇论文，我们在点下面考虑静止Bénard类型的分布式的最佳的控制问题的有限元素近似明智的控制限制。状态和co-states被低顺序的混合有限元素空格或片的多项式函数接近明智的线性函数和控制被片接近明智的经常的函数。我们为控制给超级集中分析；近似有集中的秒顺序率，这被证明。我们进一步为状态和co-states给超级集中分析。然后，我们在L2标准在L^∞-norm和最佳的错误估计导出错误估计。

简介：Basedonthediscretetimemethod,aneffectivemovementcontrolmodelisdesignedforagroupofhighspeedtrainsonarailnetwork.Thepurposeofthemodelistoinvestigatethespecifictrafficcharacteristicsofhigh-speedtrainsundertheinterruptionofstochasticirregularevents.Inthemodel,thehigh-speedrailtrafficsystemissupposedtobeequippedwiththemoving-blocksignallingsystemtoguaranteemaximumtraversingcapacityoftherailway.Tokeepthesafetyoftrains’movements,someoperationalstrategiesareproposedtocontrolthemovementsoftrainsinthemodel,includingtractionoperation,brakingoperation,andentering-stationoperation.Thenumericalsimulationsshowthatthedesignedmodelcanwelldescribethemovementsofhigh-speedtrainsontherailnetwork.Theresearchresultscanprovidetheusefulinformationnotonlyforinvestigatingthepropagationfeaturesofrelevantdelaysundertheirregulardisturbancebutalsoforreroutingandreschedulingtrainsontherailnetwork.