简介:Anewmeshfreemethodproposedbytheauthorswaspresented,inwhichthederivativesateachnodewereconstructedusingwholederivativeformulasthroughthenodesselectedaroundthenodeusinglocalCartesianframeinanautonomousmanner,sothatwithoutanyelementitcouldbeconsideredasacompletelymeshfreemethod.Themethodwastestedwithanumericalexample,andreliablesolutionwasobtainedwithhighaccuracyandefficiency.
简介:Amethodforfairingasurfacecomposedofasetofdiscretedatapointsdistributedinanonrectangulartopologicalmeshispresented.AllcurvesareexpressedbynonuniformcubicB-splinecurves.Thefairingmethodisminimizingtheelasticstrainenergyofmeshcurvesandofspringsat-tachedtothedatapoints.Thefairingsurfacecanbegeneratedbyinterpolatingthroughthemeshcurves.Thegenerationandfairingofashiphullsurfaceisgivenasanexample.
简介:Thispaperpresentsanapproachwhichenablessurfacemodelling,meshgenerationandtheFiniteElement(FE)analysistobeintegratedtogethertosimulatesuperplasticformingprocessforcomplexshapedcomponents.TechniqueshavebeendevelopedtogenerateanFEmeshovernon-four-sidedsurfaceareas,theboundariesofwhichareBeziercurvesofarbitrarydegree,usingaconsistentexpression.TheoreticalevidenceisgiventodeterminethenumberofBeziertriangularpatchesrequiredforaccuratelyre-constructingdiesurfaceswithinacommercialFEsolver.Thedevelopedtechniqueshavebeensuccessfullyusedindeterminingtheprocessparametersforforminga3Drectangularbox.
简介:Wepresentanovelalgorithmforadaptivetriangularmeshcoarsening.Thealgorithmhastwostages.First,theinputtriangularmeshisrefinedbyiterativelyapplyingtheadaptivesubdivisionoperatorthatperformsaso-calledred-greensplit.Second,therefinedmeshissimplifiedbyaclusteringalgorithmbasedoncentroidalVoronoitessellations(CVTs).TheaccuracyandgoodqualityoftheoutputtriangularmeshareachievedbycombiningadaptivesubdivisionandtheCVTstechnique.Testresultsshowedthemeshcoarseningschemetoberobustandeffective.Examplesareshownthatvalidatethemethod.
简介:AnovelconstructionalgorithmispresentedtogenerateaconformingVoronoimeshforanyplanarstraightlinegraph(PSLG).Itisalsoextendedtotesselatemultiple-intersectedPSLGs.Allthealgorithmsareguaranteedtoconverge.Examplesaregiventoillustrateitsefficiency.
简介:Withthedevelopmentofadvancedimagingtechnology,digitalimagesarewidelyused.Thispaperproposesanautomaticquadrilateralmeshgenerationalgorithmformulti-colourimagedstructures.Ittakesanoriginalarbitrarydigitalimageasaninputforautomaticquadrilateralmeshgeneration,thisincludesremovingthenoise,extractingandsmoothingtheboundarygeometriesbetweendifferentcolours,andautomaticall-quadmeshgenerationwiththeaboveboundariesasconstraints.Anapplicationexampleis...
简介:摘要:Abstract本文分析当前应急通信组网技术现状,对多种公共及行业通信网络、宽带及窄带通信网络优缺点进行对比,结合笔者所在省级单位对消防应急通信网络的实际需求,探讨一个基于全省无线消防应急保底自组网和快速部署自组网多级组网协同调度指挥的方案,在成本、可靠性、扩展性、实用性及快速部署能力等多方面取得综合平衡,以期在消防应急救灾工作中提供高质量通信保障,最后对该消防应急无线保底自组网配合突发应急抢险救援快速自组网发展作出展望。
简介:WirelessMeshNetworks(WMNs)areenvisionedtosupportthewiredbackbonewithawirelessBackboneNetworks(BNet)forprovidinginternetconnectivitytolarge-scaleareas.Withawiderangeofinternet-orientedapplicationswithdifferentQualityofService(QoS)requirement,thelarge-scaleWMNsshouldhavegoodscalabilityandlargebandwidth.Inthispaper,aLoadAwareAdaptiveBackboneSynthesis(LAABS)algorithmisproposedtoautomaticallybalancethetrafficflowintheWMNs.TheBNetwilldynamicallysplitintosmallersizeormergeintobiggeroneaccordingtostatisticloadinformationofBackboneNodes(BNs).SimulationresultsshowLAABSgeneratesmoderateBNetsizeandconvergesquickly,thusprovidingscalableandstableBNettofacilitatetrafficflow.
简介:Anintegratedtetrahedrizationalgorithmin3DdomainwhichcombinestheDelaunaytetrahedralmethodwithun-Delaunaytetrahedralmethodisdescribed.ThealgorithmwasdevelopedbyconstructingDelaunayTetrahedronsfromascatteredpointset,recoveringboundariesusingDelaunayandun-Delaunaymethod,insertingadditionalnodesinunsuitabletetrahedrons,optimizingtetrahedronsandsmoothingthetetrahedralmeshwiththe2D-3DLaplacianmethod.ThealgorithmhasbeenappliedtotheinjectionmoldingCAEpreprocessing.