简介:Thispaperpresentsanewboundaryintegralequatiònfortwo-dimensionalelasticitywiththestresscomponentσijtitjasoneoftheboundaryvalues,wheretiisthedirectioncosineofthetangentontheboundary.ThisformofBEMhasanadvantageinthatthestresscomponentσijtitjontheboundarycanbecalculateddirectlyfromthenumericalsolution.Thepresentformulationforplaneproblemsusestwokernels,theoneislogarithmicallysingularandtheotheris1/rsingular.Theeffectivenessoftheapproachisalsodiscussedthroughtestexamples.
简介:Inthispaper,weconsideraninverseproblemofdeterminingthecorrosionoccurringinaninaccessibleinteriorpartofapipefromthemeasurementsontheouterboundary.TheproblemismodelledbyLaplace'sequationwithanunknowntermγintheboundaryconditionontheinnerboundary.BasedontheMaz'yaiterativealgorithm,aregularizedBEMmethodisproposedforobtainingapproximatesolutionsforthisinverseproblem.Thenumericalresultsshowthatourmethodcanbeeasilyrealizedandisquiteeffective.
简介:Theboundaryelementmethodforthemodalanalysisoffreevibrationfor3-Danisotropicstructuresusingparticularsolutionshasbeendeveloped.Thecompletepolynomialsofordertwoareusedtoconstructtheparticularsolutionsforgeneralanisotropicmaterials.Thenumericalresultsfor3-Dfreevibra-tionanalysisofanisotropiecantileverbeambythemethodpresentedisingoodagreementwiththeresultsus-ingtheRitztechnique.Foranisotropicmaterials,thenumericalresultscalculatedfromtheproposedmethodareingoodagreementwiththeresultsfromMSC.NASTRAN.
简介:-Forthediscretizationofhigherorderelements,thispaperpresentsamodifiedintegraldomainmethodtoremovetheirregularfrequenciesinheritedintheintegralequationofwavediffractionandradiationfromasurface-piercingbody.Thesetofover-determinedlinearequationsobtainedfromthemethodismodifiedintoanormalsetoflinearequationsbysuperposingasetoflinearequationswithzerosolutions.Numericalexperimentshavealsobeencarriedouttofindtheoptimumchoiceofthesizeoftheauxiliarydomainandthediscretizationonit.
简介:实际兴趣的许多问题的几何学从圆形或椭圆形的弧被创造。弧边界元素能确切代表这些边界,并且因而,错误由表示用多项式形状功能的如此的几何学能被移开引起。为了充分利用圆形的边界,非退化的边界积分方程(BIEs)和一个将军的几何学,为弧元素可得到的非线性的转变技术被介绍外面移开或抑制不可分的核的单个或将近单个的性质。几个基准2Delastostatic问题证明现在的算法罐头有效地处理为边界层效果和薄墙的结构的问题发生在边界元素方法(BEM)的单个、将近单个的积分。由于准确几何表示的雇用,没有增加另外的更计算的努力,仅仅沿着边界和高精确性要划分的元素需要的一个小数字能被完成。[从作者抽象]
简介:在这份调查报纸,我们在边界元素方法(BEM)的hp版本的最近的开发报导。作为我们认为弱单个的模型问题和平面、开的表面上的第一种类型的hypersingular积分方程。我们证明Galerkin答案(在几何网孔上与hp版本计算了)向不可分的方程的准确答案快指数地收敛。一个hp适应的算法被给,hp版本BEM的实现为性恶的边界元素僵硬矩阵和有效preconditioners的选择被讨论。我们也为在接触条件仅仅在Gauss-Lobatto点的分离集合上被强制的线性弹性解决Signorini接触问题评论hp版本BEM的使用。数字结果被介绍它加重理论结果。[从作者抽象]
简介:摘 要:本文运用吉尔伯特行为工程模型( BEM),以数据、信息和反馈,资源、流程和工具,后果、激励和奖励等三个因素为架构,对电站服务业企业在成本管控中存在的问题进行了排查、分析,并提出相应的改进措施和方法,为电站服务业企业的成本管控提供一种新的思路和借鉴。
简介:AmethodofcoupledBEM-FEManalysisfortheelasticspatialstructuresystemispresented.Itcanbeappliedtothecalculationofthestressanddeformationofthelarge-diamatercylinderstructuresystemanditissuitableforsymmetricornon-symmetricstructuresunderthedistributedorconcentratedload.NumericalexamplesshowthattheproposedmethodandcomputerprogramBEFEMarequiteefficientintheanalysisofthelarge-diametercylinderstructureproblemsinoceanengineering.
简介:Theboundaryelementmethod(BEM)isamainmethodforanalyzingtheinteractionsbetweenthewavesandthemarinestructures.AswiththeBEM,asetoflinearequationsaregeneratedwithafullmatrix,therequiredcalculationsandstorageincreaserapidlywiththeincreaseofthestructurescale.Thus,anacceleratedmethodwithalowstorageisdesirableforthewaveinteractionwithaverylargestructure.AsystematicreviewisgiveninthispaperfortheBEMforsolvingtheproblemofthewaveinteractionwithalargescalestructure.VariousintegralequationsarederivedbasedondifferentGreenfunctions,theadvantagesanddisadvantagesofdifferentdiscretizationschemesoftheintegralequationsbytheconstantpanels,thehigherorderelements,andthesplinefunctionsarediscussed.Forthehigherorderelementdiscretizationmethod,thespecialconcernsaregiventothenumericalcalculationsofthesingle-layerpotential,thedoublelayerpotentialandthesolidanglecoefficients.Foralargescalecomputationproblemsuchasthewaveinteractionwithaverylargestructureoralargenumberofbodies,theBEMswiththeFMMandpFFTaccelerationsarediscussed,respectively,includingtheprinciplesoftheFMMandthepFFT,andtheirimplementationsinvariousintegralequationswithdifferentGreenfunctions.Finally,somepotentialapplicationsoftheaccelerationmethodsforproblemswithlargescalecomputationsintheoceanandcoastalengineeringareintroduced.
简介:Thispaperpresentsanewstrategyofusingtheradialintegrationboundaryelementmethod(RIBEM)tosolvenon-homogeneousheatconductionandthermoelasticityproblems.Inthemethod,theevaluationoftheradialin-tegralwhichisusedtotransformdomainintegralstoequivalentboundaryintegralsiscarriedoutonthebasisofelementalnodes.Asaresult,thecomputationaltimespentinevaluatingdomainintegralscanbesavedconsiderablyincomparisonwiththeconventionalRIBEM.Threenumericalexamplesaregiventodemonstratethecorrectnessandcomputationalefficiencyoftheproposedapproach.