简介：Theeffectivenessofafluid-loadedsandwichedviscoelasticlayerinsuppressingacousticscat-teringandradiationhasbeenestimatedusingtheThomson-Haskellmatrixmethod.TheGU(GaunaurdandUberall)resonancetheoryhasbeenadoptedtohandlethreetypesofviscoelasticsubstrateswithair-filledin-clusions.Theeffectsofthevaryingthicknessofthesubstrates,thevolumefractionsoftheinclusionsandfre-quenciesofincidentwaveshavebeenstubbedtodeterminetheoptimalstrategiesofsignalreduction.Intheinvestigation,themonopoleresonancephenomenaoftheinclusionshavebeentakenintoaccount.

简介：thehydroxya-patite粒子的机械性质上的水吸着的损坏效果增强了Bis-GMA/TEGDMA共聚物(HA/Bis-GMA/TEGDMA)用3D被预言了有限房间模型。聚合物矩阵上的可塑剂效果被看作它的幼仔的模量的一个变化。三个不同房间模型被用来决定在debondingdamage上改变粒子内容，分裂期间力量和潮湿集中的影响。压力分发模式被检验了，压力转移模式澄清了。幼仔Bis-GMA/TEGDMA的模量和破裂力量合成也有或没有损坏的考虑用模型被预言。有thedebonding损坏的考虑的以前的结果在对存在文学的好同意是试验性的数据。我们的建议模型和一条其他的途径的防护效果被讨论。FCC房间模型也被扩大了预言批评负担为损坏并且undamaged合成题目到3点曲折测试。

简介：Tosolvethecoupledvibrationofagravitydam-reservoirsystemwithvariablewaterdepthbyusingahybridelementmethod,thefluidregionwithvariablewaterdepthneedstobedis-cretizedbyFEmeshes.However,suchamethodasksforagreatcomputationalcostowingtotheex-cessiveunknowns,especiallywhenthefluidregionwithvariablewaterdepthisrelativelylarge.Toovercometheshortcoming,arefinedboundaryelementmethodisproposedtoanalyzethefluidfield,inwhichonlythediscretizationfortheboundaryofthevariabledepthregionisrequired.Butasabasisofthisapproach,itisnecessarytoconstructanewGreen’sfunctioncorrespondingtoaninfinitestripregion.TheproblemissolvedasthefirststepinthispaperbyemployingFridman’soperatorfunctiontheory,andthenamixedFE-BEformulationforanalyzingthefreevibrationofthegravitydam-reservoirsystemisderivedbymeansofthecouplingconditionsonthedam-reservoirinterface.Final-ly,anumericalexampleisprovidedtoillustrateagreatimprovementofthemethoddevelopedhereinoverthehybridelementmethod.

简介：Basedontheextendedhomogeneouscapacityhighprecisionintegrationmethodandthespectrummethodofvirtualboundarywithacomplexradiusvector,anovelsemi-analyticalmethod,whichhassatisfactorycomputationeffectivenessandprecision,ispresentedforsolvingtheacousticradiationfromasubmergedinfinitenon-circularcylindricalshellstiffenedbylongitudinalribsbymeansoftheFourierintegraltransformationandstationaryphasemethod.Inthiswork,besidesthenormalinteractingforce,whichiscommonlyadoptedbysomeresearchers,theotherinteractingforcesandmomentsbetweenthelongitudinalribsandthenon-circularcylindricalshellareconsideredatthesametime.Theeffectsofthenumberandthesizeofthecross-sectionoflongitudinalribsonthecharacteristicsofacousticradiationareinvestigated.NumericalresultsshowthatthemethodproposedismoreefficientthantheexistingmixedFE-BEmethod.