学科分类
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6 个结果
  • 简介:Afinitedifferencemethodispresentedtosimulatetransversevibrationsofanaxiallymovingstring.Bydiscretizingthegoverningequationandtheequationofstress-strainrelationatdifferentfrictionalknots,twolinearsparsefinitedifferenceequationsystemsareobtained.Thetwoexplicitdifferenceschemescanbecalculatedalternatively,whichmakethecomputationmuchmoreefficient.Thenumericalmethodmakesthenonlinearmodeleasiertodealwithandoftruncationerrors,O(Δt~2+Δx~2).Italsoshowsquitegoodstabilityforsmallinitialvalues.Numericalexamplesarepresentedtodemonstratetheefficiencyandthestabilityofthealgorithm,anddynamicanalysisofaviscoelasticstringisgivenbyusingthenumericalresults.

  • 标签: 有限差分法 轴向移动 横向振动 黏弹性的 交互迭代 动力学分析
  • 简介:为有一个横向的裂缝的一条半长带的飞机橡皮问题被调查。起始的问题被一个不可分的转变方法的使用与一个概括计划归结为一个一个维的连续问题。一个维的问题首先作为一个向量边界问题被提出,然后归结为三个单个不可分的方程(SIE)的一个系统。系统被一个直角的多项式方法和一个特殊概括方法的使用解决。这个工作的贡献是核的考虑在解决系统的固定奇特。相对半长带的裂缝长度和它的地点侧面的方面被调查简化问题陈述。这简化把起始的问题归结为二SIE的一个系统。

  • 标签: 半长带 横向的快克 草地工作 不可分的转变 固定奇特 单个不可分的方程(SIE )
  • 简介:Theprincipleand1:3internalresonanceofarectangularthinplateinatransversemagneticfieldisinvestigated.Basedonthemagneto-elasticvibrationequationandelectromagneticforceexpressionsofthethinplates,thenonlinearmagneto-elasticvibrationdifferentialequationsofrectangularplatesunderexternalexcitationinatransversemagneticfieldarederived.Forarectangularplatewithonesidefixedandthreeothersidessimplysupported,thetwo-degree-offreedomnonlinearDuffingvibrationdifferen-tialequationsareproposedbythemethodofGalerkin.Themethodofmultiplescalesisadoptedtosolvethemodelequationsandobtainfourfirst-orderordinarydifferentialequationsgoverningmodulationoftheamplitudesandphaseanglesinvolvedviathefirst-orderorthesecond-orderprimary-internalreso-nances.Withanumericalexample,theamplitudefrequencyresponsecurves,timehistoryresponses,phaseportraitsandPoincaremapsofthefirsttwoordervibrationmodesviaprinciple-internalresonancearerespectivelycaptured.Andtheeffectsofexternalexcitationamplitudes,magneticfieldintensitiesandthicknessesonthevibrationofsystemarediscussed.Theresultsshowthattheresponseisdominatedbythelowmodewhenprinciple-internalresonanceoccurs.Theinternalresonanceprovidesamechanismfortransferringenergyfromahighmodetoalowmode.

  • 标签: MAGNETO elastic CONDUCTIVE THIN plate Principle-internal
  • 简介:Ritzmethodisaneffectivewaywidelyusedtoanalyzethetransversebendingofthinrectangularplates.Itsaccuracydependscompletelyonthebasisfunctionsselected.Thispaperselectsthesuperpositionofsineserieswithpolynomialsasthebasisfunctionsofthinrectangularplates.Thecalculatingformulaearenotonlysimpleandeasilyprogrammed,butalsohavehighaccuracy.Finally,twonumericalresultsaregivenandcomparedwiththoseobtainedbytheclassicalmethod.

  • 标签: RECTANGULAR PLATE BENDING SMALL DEFLECTION
  • 简介:Basedonthevariationandharmonicequationsandbytakingthemaximumamplitudeoftheshellcenterastheperturbationparameter,nonlinearvibrationofthinshallowconicshellsundercombinedactionofperipheralmomentandtransverseloadswassolved.Thelinearnaturalfrequencycanbegotbythefirst-orderapproximationandthemoreaccuratenonlinearfrequencyisgotbythesecond-orderapproximationundertheactionofstaticloads.Meanwhilethethird-orderapproximateanalyticexpressionisgivenfordescribingthenonlinearrelationbetweennaturefrequencyandperipheralmoment,transverseloads,amplitude,baseangleunderthesmalldeformation.Withinsomerange,thecomplexandregularityofthenonlinearrelationcanbedirectlyobservedfromthenumericresults.

  • 标签: 非线性变化 自然频率 微扰变化理论 圆锥薄板 横向负载 谐波方程
  • 简介:Thispaperdealswithfinitedeformationproblemsofcantileverbeamwithvariablesec-tionundertheactionofarbitrarytransverseloads.Bytheuseofamethodofvariablereplacement,thenonlineardifferentialequationwithvariedcoefficientfortheproblemcanbetransformedintoanequationwithvariableseparable.Theexactsolutioncanbeobtainedbytheintegrationmethod.Someexamplesaregiveninthepaper,andtheresultsoftheseexamplesshowthatthisexactsolutionincludestheexistingsolutionsinreferencesasspecialcases.

  • 标签: CANTILEVER beam with VARIABLE SECTION finite