简介：Thechaotictransientsofacurvedfluidconveyingtubesubjectedtoanonlinearfoundationareinvestigated.TheassumptionoftheinextensibilityofthetubeisappliedtoderivethenonlineardifferentialequationofmotionviatheNewtonianapproach,withthedifferentialquadraturemethodusedtodiscretizethecurvedtubemodelinthespatialdomain.Andthenonlineardynamicmotionequationisobtained.Thenumericalanalysisshowsthat,thefinalsteadystatesaresensitivetotheinitialsystemconditionsinalargeparameterregionofthefluidspeed.Thisphenomenonofchaotictransientsisinfrequentforfluidconveyingtubes.

简介：Basedontheformerresearchworkoftheauthors,theresistanceofdifferentsolidparticlesuspensionflowinaverticalpipeisanalysed,andinvestigatedexperimentally.Theapplicableformulasofpressuredroparepresented.Twotypesofpar-ticles,talcumpowderandglassbeads,areconvcyedinthetestwhichhasbeencarriedoutatvariousairvclocitiesof10to28m/sandattheratioofsolids-airmassflowraterangedfrom0to2.Theexperimentalresultsshowagoodagreementwiththecalculatedones.

简介：稠密阶段的灵魂在水平管道在4.0MPa的一个压力下面传送研磨的煤的气体/固体的流动政体在直径的10公里，被电的电容断层摄影术(ECT)用8个电极监视。改进电容测量的精确性，测量电路的一个基于交流的单个隧道的电容被开发，并且一个修改反复的Landweber算法被用来重建图象。一个二液体的模型基于小粒的流动的运动理论被用来学习稠密阶段的灵魂传送研磨的煤的三维的不变的流动行为。

简介：Absorptionofacousticnanowaveinspecificfrequencyregionisimportantforthedesignofacousticfilter.Thispaperputsforwardametamaterialmodelmadeupoffluid-conveyingcarbonnanotubes(CNT),whichcanabsorbacousticnanowaveinagivenfrequencyrangebyadjustingthelengthsandfluidvelocitiesofthemselves.Absorptioncoefficientsarecalculatedoutthroughthecombinationofthefiniteelementmethodwiththetheoreticalmodel,whichare0.4~0.55relatingtodifferentfluidvelocitiesforthecrossing-distributedmodel.Comparisonsaremadebetweenthecrossedmodelandthealignedone,whichprovethattheCNTforestwithcrosseddistributionismoreeffectiveinacousticwaveabsorption.

简介：

简介：首先，有不同坚硬的粒子的低速度的传送的特征试验性地以流动模式和压力落下在一条水平管道被调查证明蛞蝓流动能被分类进取决于沿着管道安定粒子的二种类型，并且没有解决的层，时期为蛞蝓流动是小的，它被叫独居的蛞蝓流动。为软粒子的压力落下被显示为难粒子比那大。然后，试验性的结果在证明从传送隧道的最高的表面的那个空气版本是为粒子的高集体的流动率的一个重要因素的好粉末的水平使流体化床的传送上被介绍。

简介：格林功能方法(GFM)被利用分析在里面飞机强迫了传送液体的弄弯的管子的颤动，在外部刺激和增加的团和抑制比率的randomicity和分发被考虑的地方。Laplace变换被使用，并且有各种各样的边界条件的格林功能随后被获得。数字计算被执行在正切、光线的排水量上验证一些关键参数的现在的解决方案，和效果进一步被调查。有线性、非线性的运动限制的强迫的颤动问题也简短被讨论。方法能被散发学习与管子或更广泛的问题联系的强迫的颤动问题的另外的形式。

简介：Ananalyticalmodelisdevelopedtostudythesurfaceeffectsonthevibrationbehaviorincludingthenaturalfrequencyandthecriticalflowvelocityoffluid-conveyingnanotubesembeddedinanelasticmedium.TheeffectsofsurfaceelasticityandresidualsurfacestressareaccountedthroughthesurfaceelasticitymodelandtheYoung-Laplaceequation.AWinkler-typefoundationisemployedtomodeltheinteractionofnanotubesandthesurroundingmedium.Theresultsshowthatthesurfaceeffectshavemoreprominentinfluencesonthenaturefrequencywithsmallernanotubethickness,largeraspectratioandlargerelasticmediumconstants.Bothsurfacelayersandtheelasticmediumenhancethestabilityofnanotubes.Thisstudymightbehelpfulfordesigningthefluid-conveyingnanotubedevicesinNEMSandMEMSsystems.

简介：基于Fl銈賦蒚雨馢髧蚜?蒚?蒚??鋥??吗？

简介：处于在边界随机刺激下面的飞机紧张状态的压电的厚壳的随机的反应与压电的圆柱的壳被学习并且说明。为电的潜力的微分方程放射状地是综合的作为排水量的功能获得电的潜力。随机的压力边界条件被转变变换成同类的，它在随机的刺激下面为排水量产出电、机械的联合微分方程。然后，这个部分微分方程用Galerkin方法和Legendre多项式被变换成平常的微分方程，它与不对称的僵硬矩阵代表一个随机的multi-degree-of-freedom系统由于电、机械联合并且转变边界条件。频率反应功能矩阵和反应力量光谱系统的密度矩阵基于随机的颤动的理论被导出。吝啬平方的排水量和压电的壳的电的潜力最后被获得，并且频率反应特征和电、机械的联合性质被探索。

简介：

简介：Thenonlinearbehaviorofacantileveredfluidconveyingpipesubjectedtoprincipalparametricandinternalresonancesisinvestigatedinthispaper.Theflowvelocityisdividedintoconstantandsinusoidaiparts.Thevelocityvalueoftheconstantpartissoadjustedsuchthatthesystemexhibits3:1internalresonancesforthefirsttwomodes.Themethodofmultiplescalesisemployedtoobtaintheresponseofthesystemandasetoffourfirst-ordernonlinearordinary-differentialequationsforgoverningtheamplitudeoftheresponse.TheeigenvaluesoftheJacobianmatrixareusedtoassessthestabilityoftheequilibriumsolutionswithvaryingparameters.Thecodimension2derivedfromthedouble-zeroeigenvaiuesisanalyzedindetail.Theresultsshowthattheresponseamplitudemayundergosaddle-node,pitchfork,Hopf,homoclinicloopandperiod-doublingbifurcationsdependingonthefrequencyandamplitudeofthesinusoidalflow.Whenthefrequencyofthesinusoidalflowequalsexactlyhalfofthefirst-modefrequency,thesystemhasaroutetochaosbyperiod-doublingbifurcationandthenreturnstoaperiodicmotionastheamplitudeofthesinusoidalflowincreases.