简介：可变几何学捆绑操纵者(VGTM)有潜力在未来空间应用程序，一个动态模型对系统的动态分析和控制重要工作。在这份报纸，一条途径被介绍由独立变量为VGTM的动态方程建模，它由二双octahedral组成捆绑单位和3-revolute-prismatic-spherical(3-RPS)平行操纵者。在这条途径，二邻近的身体的运动学的递归的关系并且几何抑制被用来推出VGTM的运动学的方程，并且Jourdains速度变化原则被采用建立系统的动态方程。建议动态模型的有效性被数字模拟的比较与软件亚当斯验证。而且，为轨道追踪系统的一个活跃控制器被计算转矩方法设计。控制器的有效性数字地被证明。

简介：Thispaperisconcernedwiththeoptimumdesignandsensitivityanalysismethodsofpiezo-electricintelligenttrussesonthestructuralstiffnessandfree-vibrationfrequency.Onthebasisofthefiniteel-ementmethodandtakingintoaccountthemechanical-electriccouplingeffectunderelectricloadandme-chanicalload,thecomputationalformulaofsensitivitiesofstructuraldisplacementandfree-vibrationfrequen-cywithrespecttothesizeandshapedesignvariablesareproposed.Anewkindofdesignvariableoftheelectricvoltageandthecalculatingmethodofdisplacementsensitivitywithrespecttotheelectricvoltagevari-ableispresented.Thenewmethodforstructuraldeformationcontrolbyoptimizingthevoltagesofpiezoelec-tricactivebarsisgiven.ThenumericalmethodsofoptimumdesignandsensitivityanalysisforpiezoelectrictrussstructuresareimplementedinJIFEXsoftware.Numericalexamplesdemonstratetheeffectivenessofthemethodsandtheprogram.

简介：精确预言近海结构运动反应和伙伴绳索线紧张在技术应用和科学研究是重要的。在我们的学习，一个truss圆材平台，在墨西哥湾操作了，被一对内部地数字的代码夫妇数字地模仿并且分析。站台运动回答和联系绳索行紧张通过一个时间领域被计算并且调查非线性的联合动态分析。在模拟和相应领域大小之间的令人满意的同意在联系的将军，显示数字代码能被用来进行与它的绳索和起床人系统交往的truss圆材的时间域分析。基于在线性、非线性的结果之间的比较，在预言站台运动反应和绳索行紧张的非线性的相对重要性被估计并且介绍。通过联合并且伪静电干扰分析，在在预言系在的行紧张和站台运动的站台壳和绳索/起床人的系统之间的动态联合效果的重要性被确定。这些结果可以提供从属便于大规模的数字模拟和设计的必要信息近海结构。

简介：Theresearchpurposeofthispaperistoestimatetheimpactsoftheparametersoftheguideplateontheverticalmotioncharacteristicsofthemoonpoolfluid.Withthevolumeoffluid（VOF）method,three-dimensionalmodelsofthemoonpoolfluidmotionsofthetrusssparplatformareestablished.Simulationresultsarethenpresentedforthemoonpoolforcedoscillationbyemployingthedynamicmeshmethodanduser-definedfunctionsinFLUENT.Themotionsofthemoonpoolfluidandtheloadsontheguideplatesareobtainedforbothcasesofsquare-ringandcrisscross.Theresultsshowthattheshapeandareaoftheguideplateatthebottomofthemoonpoolhaveasignificantimpactonthephysicalparametersofthemoonpool,includingtheloadonthemoonpoolguideplate,motionformofthemoonpoolfluidandthemassflowrate.

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简介：在这篇论文，为设计优化的一个方法elasto塑料捆绑结构基于参量的变化原则(PVP)被建议。优化试图在许可的节点排水量的限制下面发现最小的重量/卷答案。Thedesign优化是有平衡限制(MPEC)的数学编程的明确的表达。在优化克服互补限制的数字困难，重复进程，包括二次的编程(QP)和更新的进程，被采用著名计算机生产厂商他优化方法。而且，elasto塑料的弄弯捆绑成员在设计优化被看作限制。combinational优化策略为排水量限制和弄弯的限制被建议，它包括上面提及的方法和一个最佳的标准。三个数字例子被举证明方法的有效性求婚了。

简介：Thisstudyinvestigatedcharacteristicsofbifurcationandcriticalbucklingloadbyshapeimperfectionofspacetruss,whichweresensitivetoinitialconditions.Thecriticalpointandbucklingloadwerecomputedbytheanalysisoftheeigenvaluesanddeterminantsofthetangentialstiffnessmatrix.Thetwo-free-nodesexampleandstardomewereselectedforthecasestudyinordertoexaminethenodalbucklingandglobalbucklingbythesensitivitytotheeigenbucklingmodeandtheanalysesoftheinfluence,andcharacteristicsoftheparametersasdefinedbytheloadratioofthecenternodeandsurroundingnode,aswellasrise-spanratiowereperformed.Thesensitivitytotheimperfectionoftheinitialshapeofthetwo-free-nodesexample,whichoccursduetosnappingatthecriticalpoint,resultedinbifurcationbeforethelimitpointduetothebucklingmode,andthebucklingloadwasreducedbytheincreaseintheamountofimperfection.Thetwosensitivebucklingpatternsofthenumericalmodelareestablishedbyinvestigatingthedisplacedpositionofthefreenodes,andtheasymmetriceigenmodegreatlyinfluencedthebehavioroftheimperfectionshapewhetheritwasatlimitpointorbifurcation.Furthermore,thesensitivemodeofthetwo-free-nodesexamplewassimilartothein-extensionalbasismechanismofasimplifiedmodel.Thestardome,whichwasusedtoexaminetheinfluenceamongseveralnodes,indicatedthattheinfluenceofnodalbucklingwasgreaterthanthatofglobalbucklingastherise-spanratiowashigher.Besides,globalbucklingisoccurredwithreachingbifurcationpointasthevalueofloadratiowashigher,andthebucklingloadlevelwasabout50%-70%ofloadlevelatlimitpoint.

简介：就静态的稳定性和排水量体积的变化而言，包括非线性的术语和即时波浪出现的更高的顺序的影响，非线性的联合举沥青运动在随机的波浪被建立。联合的举沥青的回答打手势因为Truss海岸警卫队女子后备队队员站台被调查。当一个随机的波浪的典型频率接近自然的举频率时，大振幅沥青运动在参量力量的刺激下面被导致，这被发现，它被称为Mathieu不稳定性。举运动振幅什么时候超过某个程度，被观察举模式精力被转移搭模式。另外，当典型波浪频率离开自然的举频率时，内部反响的举沥青运动的概率极大地被减少。

简介：Inthispaper,amathematicalmodelfortopologyoptimizationoftrussstructureswithconstraintsofdisplacementandsystemreliabilityundermultipleloadingcasesisconstructed.Inordertoavoidthedifficultyofcomputingthestructure’ssystemreliability,asolvingapproachispresentedinwhichthefailureprobabilityofsystemisdividedintothesumofallbars’failureprobabilitybymeansofreliabilitydistribution.Inaddition,bydrawingintothereliabilitysafetyfactorandthefundamen-talrelationshipinstructuralmechanics,allprobabilityconstraintsofdisplacementandstressareequiv-alentlydisplayedasconventionalformandlinearfunctionofthedesignvariables.Theoptimizationproblemwithmultipleconstraintsistreatedbythecompactconstrainttacticsandissolvedbytheim-provedsimplexmethod.Theexamplesshowthattheapproachproposedinthispaperisfeasibleandef-ficient.

简介：在这篇论文，适应基因算法(统帅)被用于拓扑学优化与频率领域刺激捆绑结构。优化限制在基础加速刺激下面包括基本频率，在力量刺激下面的排水量回答和加速回答。轮盘赌车轮选择操作员，适应转线路和变化操作员被用作基因操作员。一些启发式的策略被提出指导额外的酒吧和节点的删除在上捆绑结构。三个例子证明建议方法能产出最佳结构形式和最轻的重量撤退结构当时令人满意的动态反应限制。

简介：Anewexist-nullcombinedmodelisproposedforthestructuraltopologyoptimization.Themodelisappliedtothetopologyoptimizationofthetrusswithstressconstraints.Satisfactorycomputationalresultcanbeobtainedwithmorerapidandmorestableconvergenceascomparedwiththecross-sectionaloptimization.Thisworkalsoshowsthatthepresenceofindependentandcontinuoustopologicalvariablemotivatestheresearchofstructuraltopologyoptimization.

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简介：Anewalgorithmforthesolutionofquadraticprogrammingproblemsisputforwardintermsofthemixedenergytheoryandisfurtherusedfortheincrementalsolutionofelastic-plastictrussstructures.Themethodproposedisdifferentfromthetraditionalone,forwhichtheunknownvariablesareselectedjustinoneclasssuchasdisplacementsorstresses.Thepresentmethodselectsthevariablesinthemixedformwithbothdisplacementandstress.Asthemethodisestablishedinthehybridspace,theinformationfoundinthepreviousincrementalstepcanbeusedforthesolutionofthepresentstep,makingthealgorithmhighlyeffi-cientinthenumericalsolutionprocessofquadraticprogrammingproblems.Theresultsobainedintheexam-plesoftheelastie-plasticsolutionofthetrussstructuresverifywhathasbeenpredictedinthetheoreticalanal-ysis.

简介：拉制金属表被合拢与11%变硬工作。这些随后被使用，抵抗焊接构造X类型格子捆绑有0.17的核心亲戚密度的三明治面板。三明治面板在单轴的压缩被测试，为比较，有限元素的方法被采用模仿测量压缩压力紧张曲线。山峰压缩力量比金字塔形的核心三明治的高是32%。变硬工作的X类型格子结构的提高的机械性质主要与弯曲并且工作变硬的低度从直神气的贡献发源，而非二维的蹒跚的节点。

简介：Thispaperfocusesontheeffectoftemperatureontheout-of-planecompressivepropertiesandfailuremechanismofcarbonfiber/epoxycompositepyramidaltrusscoressandwichpanels(CF/CPTSP).CF/CPTSPwithnovelreinforcedframesaremanufacturedbythewaterjetcuttingandinterlockingassemblymethodinthispaper.Thetheoreticalanalysisispresentedtopredicttheout-of-planecompressivestiffnessandstrengthofCF/CPTSPatdifferentambienttemperatures.Thetestsofcompositesandwichpanelsareperformedthroughoutthetemperaturerangefrom-90℃to180℃.Goodagreementisfoundbetweentheoreticalpredictionsandexperimentalmeasurements.ExperimentalresultsindicatethatthelowtemperatureincreasesthecompressivestiffnessandstrengthofCF/CPTSP.However,thehightemperaturecausesthedegradationofthecompressivestiffnessandstrength.Meanwhile,theeffectsoftemperatureonthefailuremodeofcompositesandwichpanelsarealsoobserved.

简介：Structuralhealthmonitoring(SHM)isarelevanttopicforcivilsystemsandinvolvesthemonitoring,dataprocessingandinterpretationtoevaluatetheconditionofastructure,inordertodetectdamage.Inrealstructures,twoormoresitesortypesofdamagecanbepresentatthesametime.Ithasbeenshownthatonekindofdamagedconditioncaninterferewiththedetectionofanotherkindofdamage,leadingtoanincorrectassessmentaboutthestructurecondition.Identifyingcombineddamageonstructuresstillrepresentsachallengeforconditionmonitoring,becausethereliableidentificationofacombineddamagedconditionisadifficulttask.Thus,thisworkpresentsafusionofmethodologies,whereasinglewavelet-packetandtheempiricalmodedecomposition(EMD)methodarecombinedwithartificialneuralnetworks(ANNs)fortheautomatedandonlineidentification-locationofsingleormultiple-combineddamageinascaledmodelofafive-baytruss-typestructure.Resultsshowedthattheproposedmethodologyisveryefficientandreliableforidentifyingandlocatingthethreekindsofdamage,aswellastheircombinations.Therefore,thismethodologycouldbeappliedtodetection-locationofdamageinrealtruss-typestructures,whichwouldhelptoimprovethecharacteristicsandlifespanofrealstructures.

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