简介:Duetotheupcomingdemandsofnext-generationelectronic/magnetoelectronicdeviceswithlow-energyconsumption,emergingcorrelatedmaterials(suchassuperconductors,topologicalinsulatorsandmanganites)areoneofthehighlypromisingcandidatesfortheapplications.Forthepastdecades,manganiteshaveattractedgreatinterestduetothecolossalmagnetoresistanceeffect,charge-spin-orbitalordering,andelectronicphaseseparation.However,theincapableofdeterministiccontrolofthoseemerginglow-dimensionalspinstructuresatambientconditionrestricttheirpossibleapplications.Therefore,theunderstandingandcontrolofthedynamicbehaviorsofspinorderparametersatnanoscaleinmanganitesunderexternalstimuliwithlowenergyconsumption,especiallyatroomtemperatureishighlydesired.Inthisreview,wecollectedrecentmajorprogressesofnanoscalecontrolofspinstructuresinmanganitesatlowdimension,especiallyfocusingonthecontroloftheirphaseboundaries,domainwallsaswellasthetopologicalspinstructures(e.g.,skyrmions).Inaddition,capacitor-basedprototypespintronicdevicesareproposedbytakingadvantageoftheabovecontrolmethodsinmanganites.Thiscapacitor-basedstructuremayprovideanewplatformforthedesignoffuturespintronicdeviceswithlow-energyconsumption.
简介:Becauseoflimitedresourceofembeddedplatforms,thecomputationalcomplexityofadvancedcontrolalgorithmsraisessignificantchallengesfortheuseofembeddedsystemsincomplexcontrolfield.AScilab/Scicosbasedembeddedcontrollerisdevelopedonwhichvariouscontrolsoftwarecanbeeasilymodeled,simulated,implemented,andevaluatedtomeettheever-expandingrequirementsofindustrialcontrolapplications.BuiltontheCirrusLogicEP9315ARMsystems-on-chipboard,thisembeddedcontrollerispossibletodevelopcomplexembeddedcontrolsystemsthatemployadvancedcontrolstrategiesinarapidandcost-efficientfashion.Duetothefreeandopensourcenatureofthesoftwarepackagesused,thecostoftheembeddedcontrollerisminimized.
简介:ThevariousuncertaintiesofMarsenvironmenthavegreatimpactontheprocessofvehiclesenteringtheatmosphere.Toimprovetherobustnessofcontrolsystemagainstthemodelerrorsandtoreducethecomputationalburden,anoptimalfeedbackbasedtrackingcontrollawisdeveloped.Thecontrolschemepresentedinthispaperdeterminestheamplitudeandthereversalsofbankanglerespectivelyinthelongitudinalandlateralflightplane.Ateachcontrolcycle,theamplitudeofthebankangleisobtainedbyanoptimalfeedbackcontrollertominimizetrackingerrors.Thecontrolgainsaretunedaccordingtotheclosed-looperrordynamicsbyusingoptimizationmethods.Thebankreversalsareexecutedifthecrossrangeexceedsapredeterminedcorridorwhichisdesignedbysettingaboundaryfunction.Theaccuracyandrobustnessoftheproposedclosed-loopoptimalfeedbackbasedcontrollawintrackingthereferencetrajectoryisverifiedvia500deviationsimulations,inwhichmodelingerrorsandexternaldisturbancesareconsidered.
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简介:Inthispaper,thecontrolpolicyforenvironmentwithtwokindsofirreversibility,whichworkinoppositedirectionsanduncertaintyofcostisregardedasaninvestmentdecision.Byusingreal-optiontheory,thepaperpresentsthemodeloftheoptimalcontrolpolicyforenvironmentunderthescienceandtechnologythatcanreduceenvironmentpollutionstochasticoccur.Thepaperhasdiscussedtheeffectsofchangesinthevariousparametersonthecriticalvalueatwhichthepolicyshouldbeadopted.Theresultsshowthattheoptimalcontrolpolicyisquitesensitivetothescienceandtechnologywhichcanreduceenvironmentpollutionstochasticoccur,pointingtotheimportanceofcarefullyaccountingforitsimpactindeterminingthecontrolpolicyforenvironment.
简介:Twocomplexproperties,varyingtime-delayandblock-orientednonlinearity,areverycommoninchemicalengineeringprocessesandnoteasytobecontrolledbyroutinecontrolmethods.Aimedatthesetwocomplexproperties,anoveladaptivecontrolalgorithmthebasisofnonlinearOFS(orthonormalfunctionalseries)modelisproposed.First,thehybridmodelwhichcombinesOFSandVolterraseriesisintroduced.Then,astablestatefeedbackstrategyisusedtoconstructanonlinearadaptivecontrolalgorithmthatcanguaranteetheclosed-loopstabilityandcantrackthesetpointcurvewithoutsteady-stateerrors.Finally,controlsimulationsandexperimentsonanonlinearprocesswithvaryingtime-delayarepresented.Anumberofexperimentalresultsvalidatetheefficiencyandsuperiorityofthisalgorithm.
简介:HL-2Aisatokamakwithcloseddivertor.Ithadbeenbuiltattheendof2002andbegantodischargefromthenon.TofurtherstudyplasmadischargesinHL-2A,afeedbackcontrolsystem(FBCS)forplasmapositionbadbeendevelopedin2003.
简介:这篇论文由使用可得到的加速大小在模型参数与不确定性为结构的系统论述一条柔韧的H_∞输出反馈控制途径并且为如此的一个柔韧的输出反馈控制器的存在建议条件。结构的僵硬的不确定性,抑制并且集体参数被假定围住标准。建议控制途径在线性矩阵不平等,存在凸的优化技术例如在MATLAB的LMI工具箱,能有效地并且方便地为被使用的框架以内被提出。说明建议的柔韧的H_∞策略的有效性,一座六故事的大楼两个都受到1940ElCentro地震记录并且到突然应用的Kanai-Tajimi过滤白噪音随机刺激。结果证明建议的柔韧的H_∞控制器向令人满意的结果提供或没有结构的僵硬的变化,抑制并且集体参数。
简介:Theobjectiveofthispaperistodevelopaneuralnetwork-basedresidualgeneratortodetectthefaultintheactuatorsforaspecificcommunicationsatelliteinitsattitudecontrolsystem(ACS).First,adynamicmultilayerperceptronnetworkwithdynamicneuronsisused,theseneuronscorrespondtoasecondorderlinearInfiniteImpulseResponse(IIR)filterandanonlinearactivationfunctionwithadjustableparameters.Second,theparametersfromthenetworkareadjustedtominimizeaperformanceindexspecifiedbytheoutputestimatederror,withthegiveninput-outputdatacollectedfromthespecificACS.Then,theproposeddynamicneuralnetworkistrainedandappliedfordetectingthefaultsinjectedtothewheel,whichisthemainactuatorinthenormalmodeforthecommunicationsatellite.Thentheperformanceandcapabilitiesoftheproposednetworkweretestedandcomparedwithaconventionalmodel-basedobserverresidual,showingthedifferencesbetweenthesetwomethods,andindicatingthebenefitoftheproposedalgorithmtoknowtherealstatusofthemomentumwheel.Finally,theapplicationofthemethodsinasatellitegroundstationisdiscussed.