简介:Anoveloptimizationalgorithmcalledstochasticfocusingsearch(SFS)forthereal-parameteroptimizationisproposed.Thenewalgorithmisaswarmintelligencealgorithm,whichisbasedonsimulatingtheactofhumanrandomizedsearching,andthehumansearchingbehaviors.Thealgorithm'sperformanceisstudiedusingachallengingsetoftypicallycomplexfunctionswithcomparisonofdifferentialevolution(DE)andthreemodifiedparticleswarmoptimization(PSO)algorithms,andthesimulationresultsshowthatSFSiscompetitivetosolvemostpartsofthebenchmarkproblemsandwillbecomeapromisingcandidateofsearchalgorithmsespeciallywhentheexistingalgorithmshavesomedifficultiesinsolvingcertainproblems.
简介:Theaccuracyofnumericalsimulationsandmanyothermaterialdesigncalculations,suchastherollingforce,rollingtorque,etc.,dependsonthedescriptionofstress-strainrelationshipofthedeformedmaterials.Onecommonmethodofdescribingthestress-strainrelationshipisusingconstitutiveequations,withtheunknownparametersfittedbyexperimentaldataobtainedviaplanestraincompression(PSC).DuetothehighlynonlinearbehaviouroftheconstitutiveequationsandthenoiseincludedinthePSCdata,determinationofthemodelparametersisdifficult.Inthispaper,geneticalgorithmswereexploitedtooptimiseparametersfortheconstitutiveequationsbasedonthePSCdata.TheoriginalPSCdatawereprocessedtogeneratethestress-straindata,anddatapre-processingwascarriedouttoremovethenoisecontainedintheoriginalPSCdata.Severalgeneticoptimisationschemeshavebeeninvestigated,withdifferentcodingschemesanddifferentgeneticoperatorsforselection,crossoverandmutation.Itwasfoundthattherealvaluecodedgeneticalgorithmsconvergedmuchfasterandweremoreefficientfortheparameteroptimisationproblem.
简介:ATMOSPHERICTURBULENCEINTENSITYANDDIFFUSIONPARAMETEROVERCOMPLICATEDTOPOGRAPHYOFEASTERNGUANGDONGWuYanbiao(吴艳标);LiuShuwang(刘树旺)a...
简介:Emission Temperatures from Populations of Particle Unstable States as a Function of Impact ParameterEmissionTemperaturesfromP...
简介:用为水质量的遥感技术,评估是在海洋的环境监视的一个不可避免的趋势。然而,水质量参数的更少范畴能被遥感技术比35在GB3097-1997海洋的水质量标准指定的监视。因此,我们考虑了哪个参数必须被遥感选择并且怎么用有限参数为水质量评估当模特儿。在这篇论文,集中了于Leizhou半岛nearshore水,我们发现了N,P,货到付款,PH并且做是由分析测量数据的水质量的主导的参数。然后,数学统计被用来决定在五个参数之中的关系是货到付款>>P>N>pH。最后,五参数,fourparameter和三参数的水质量评估模型被建立并且比较。结果显示出那货到付款,,P和N是为Leizhou半岛nearshore水质量,和最佳的全面的水质量的遥感评估的必要参数评估模型fourparameter模型。这个工作可以为由遥感监视另外的海洋的水的质量用作一本参考书。
简介:这篇论文论述一个分析方法,基于MacCormack鈥檚技术,为在高速度的电路网络的分布式的参数元素的时间领域敏感的评估。敏感能从分布式的参数元素的电、物理的参数被计算。建议方法是时间空间discretization的一个直接数字的方法并且不要求复杂数学扣除过程。因此,编程序是很方便的这个方法。它能在线性或非线性的电路网络被用于一般传播线的敏感分析。建议方法是second-order-accurate。数字实验被介绍表明它的精确性和效率。关键词敏感分析-分布式的参数-Multiconductor传播线-高速度的电路网络-MacCormack方法花环DOU在1974出生了。他是在科技的南京大学的自动化的部门的一个博士候选人。他的研究兴趣在分布式的参数的控制系统。王志全在1939出生了。他是在科技的南京大学的自动化的部门的一个教授。主要在非线性的控制理论和申请,他的研究兴趣被散布参数控制系统和混乱控制理论和申请。
简介:Thispaperisconcernedwiththedesignofamemorystatefeedbackcontrollerforlinearsystemswithintervaltime-varyingdelays.Thetimedelayisassumedtobeatime-varyingcontinuousfunctionbelongingtoagiveninterval,whichmeansthatthelowerandupperboundsoftime-varyingdelayareavailable.First,alessconservativedelay-range-dependentstabilitycriteriaisproposedbyusinganewintervalfractionmethod.Intheprocessofcontrollersynthesis,thehistoryinformationofsystemisconsideredinthecontrollerdesignbyintroducingthelowerdelaystate.Moreover,theusualmemorylessstatefeedbackcontrollerfortheunderlyingsystemscouldbeconsideredasaspecialcaseofthememorycase.Finally,twonumericalexamplesaregiventoshowtheeffectivenessoftheproposedmethod.
简介:Onthebasisofspectrummomentdescriptionofasignal,evolutionaryvectorisdeveopedtodescribeslowlytime-varyingnoiseprocesses.Itdescribesthemaintime-varyingpropertiesofasignal.Applicationstoaircraftflying-overnoisearepresented.
简介:Themodifiedhybridelementmethod(MHEM)isutilizedtopredictandanalyzewaveforcesonarbitrarilyshapedmultiplebodies.Thismethodcanbeappliedtowavesofallwaterdepths,i.e.shallow,intermediate,anddeepwaters,onslowlyvaryingseabed.TheMHEMemploystheICCGmethodtosaveCPUandstorage,thusthecomputationofwaveforcesforlargemulti-bodysystemscanbecarriedoutonmicrocomputers.Numericalresultsofthepresentmethodarecomparedwithexperimentaldataandothersolutions.ItisshownthattheMHEMprovidesmoreaccuratesolutionsofthewaveforcesthanothernumericalmethodsdo.Therefore,themethodologypresentedhereincanbeusedinthedesignofcoastalandoceanstructures.
简介:Thispaperdealswiththeproblemofguaranteedcostcontrolfornonlinearsystemswithtime-varyingdelayswhichisrepresentedbyTakagi-Sugeno(T-S)fuzzymodelswithtime-varyingdelays.Thederivativesoftime-varyingdelayarenotnecessarytobebounded.Basedonthefreeweightingmatrixmethod,sufficientconditionsfortheexistenceoffuzzyguaranteedcostcontrollerviastatefeedbackaregivenintermsoflinearmatrixinequalities(LMIs).Aminimizingmethodisalsoproposedtosearchthesuboptimalupperboundoftheguaranteedcostfunction.Theresultsaredelay-dependentbutcontaindelay-independentcriteriaasaspecialcase.Anumericalexampleispresentedtodemonstratetheeffectivenessandlessconservativenessofourwork.
简介:在这篇论文,一个新奇参量的基于模型的分解方法为变化时间的结构监视的结构的健康被建议。为这个目的,先进功能系列的时间依赖者汽车回归的动人的一般水准(FS-TARMA)技术被用来估计在参量的信号分解计划使用的参数和革新变化。另外,一个唯一的特征抽取和减小方法基于分解信号,已知的同样潜伏的部件(LC),被建议。为了在实验室评估建议方法,数字模拟和试验性的研究的效率,在变化时间的结构上被进行,在损坏的各种各样的类型被介绍的地方。模糊专家系统(FES)被用作一个分类工具当时,证明建议方法成功地识别不同结构的条件与另外的方法相比基于非减少、平常的特征抽取。
简介:Asetofnewgasdynamicfunctionswithvaryingspecificheatarederiveoforthefirsttime.Anoriginalanalyticalsolutionofnormalshockwavesisowrkedouttherewith.Thissolutionisthereafterfurtherimprovedbynotinvolvingtotaltemperature,Illustrativeexamplesofcomparisonaregiven,includingalsosomeapproximatesolutionstoshowtheordersoftheirerrors.
简介:在这篇论文,我们处理稳定问题因为线性变化periodicallytime交换了系统。用discretization技术,我们以矩阵不平等的答案为全球stabilizability导出新条件。为发现稳定控制器和切换的策略被介绍的一个算法。
简介:Thispaper,throughthediscountedcashflow(DCF)approach,considersinventoryreplenishmentproblemsfordeterioratingitemswithgeneraltime-varyingdemandoverafiniteplanninghorizonunderinflation.Theoptimalreplenishmentpoliciesforthetotalprofitofsystemtobemaximumarepresentedwithpartialbacklogging.Moreover,thefractionofdemandbackloggedisassumedtobeanon-increasingfunctionofwaitingtime.Firstly,themodelswithafixedfractionbackorderandcompletebackorderareprovided.Thenthemodelispresentedwithassumingthatthefractionofdemandbackloggedisanexponentiallydecreasingfunctionofwaitingtime.Thesolutionproceduresofmodelsareproposed.Theeffectofinflationontheoptimalpoliciesisshown.Themodelsareillustratedthroughnumericalexamplesandsensitivityanalysisofparametersisgiven.
简介:ThispaperdiscussesH-infinitystatefeedbackcontrolforanetworkedcontrolsystemwithtime-varyingdelays.Basedonthefree-weighingmatrixmethod,adelay-dependentstabilitycriterionsatisfyingaprescribedH-infinitynormboundispresentedforanNCSwithunknown,time-varyingandboundeddelays.Andthen,thecriterionistransformedintosufficientconditionsbasedonlinearmatrixinequalitiesforH-infinitycontrol.TheconditionsthusobtainedarealsousedtodesignanH-infinitystatefeedbackcontroller.ThisdesignmethodisfurtherextendedtosolvethedesignproblemofrobustH-infinitystatefeedbackcontrol.Anumericalexampledemonstratesthevalidityofthemethod.