简介：Anewmethodforestimationtheboundsofeigenvaluesispresented.InordertoshowthatthemethodproposeisaseffectiveasQiu’s,anundampingspring-masssystemwith5nodesand5degreesoffreedomisgiven.Toillustratethatthepresentmethodcanbeappliedtostructureswhichcannotbetreatedbynon-negativedecompsition,aplandframewith202nodesand357beamelementsisgiven.TheresultsshowthatthepresentmethodiseffectiveforestimatingtheboundsofeigenvaluesandismorecommonthanQiu’s.

简介：基于精力的一个新种类坡度理论非局部的模型在这篇论文被建议，并且理论被使用在薄金属性的电线扭转调查尺寸效果，极端薄的横梁弯曲并且多晶的铜微缩进。首先，一个精力非局部的模型被建议。基于模型，第二，一个新种类坡度理论被导出。第三，新理论被使用分析三个代表性的实验。

简介：Anewstochasticoptimalcontrolstrategyforrandomlyexcitedquasi-integrableHamiltoniansystemsusingmagneto-theological(MR)dampersisproposed.ThedynamicbehaviorofanMRdamperischaracterizedbytheBouc-Wenhystereticmodel.ThecontrolforceproducedbytheMRdamperisseparatedintoapassivepartincorporatedintheuncontrolledsystemandasemi-activeparttobedetermined.ThesystemcombiningtheBouc-Wenhystereticforceisconvertedintoanequivalentnon-hystereticnonlinearstochasticcontrolsystem.ThenItostochasticdifferentialequationsarederivedfromtheequivalentsystembyusingthestochasticaveragingmethod.Adynamicalprogrammingequationforthecontrolleddiffusionprocessesisestablishedbasedonthestochasticdynamicalprogrammingprinciple.Thenon-clippingnonlinearoptimalcontrollawisobtainedforacertainperformanceindexbyminimizingthedynamicalprogrammingequation.Finally,anexampleisgiventoillustratetheapplicationandeffectivenessoftheproposedcontrolstrategy.

简介：Anapproachbasedoncontinuumdamagemechanicstofatiguelifepredictionforstructuresisproposed.Anewfatiguedamageevolutionequationisdeveloped,inwhichtheparametersareobtainedinasimplewaywithreferencetotheexperimentalresultsoffatiguetestsonstandardspecimens.WiththeutilizationofAPDLlanguageontheANSYSplatform,afiniteelementimplementationispresentedtoperformcouplingoperationondamageevolutionofmaterialandstressredistribution.ThefatiguelivesofsomenotchedspecimensandaPitch-change-linkarepredictedbyusingtheaboveapproach.Thecalculatedresultsarevalidatedwithexperimentaldata.

简介：Inthepreviouspapers,ahighperformancesparsestaticsolverwithtwo-levelunrollingbasedonacell-sparsestorageschemewasreported.Althoughthesolverreachesquiteahighefficiencyforabigpercentageoffiniteelementanalysisbenchmarktests,theMFLOPS(millionfloatingoperationspersecond)ofLDLTfactorizationofbenchmarktestsvaryonaDellPentiumⅣ850MHzmachinefrom100to456dependingontheaveragesizeofthesuper-equations,i.e.,ontheaveragedepthofunrolling.Inthispaper,anewsparsestaticsolverwithtwo-levelunrollingthatemploystheconceptofmaster-equationsandsearchesforanappropriatedepthsofunrollingisproposed.ThenewsolverprovideshigherMFLOPSforLDLTfactorizationofbenchmarktests,andthereforespeedsupthesolutionprocess.