简介：<正>SPL-声压之王双音圈,高密度的双铁酸盐磁铁构造,为你打造雄厚震撼的超质感低音EBX250A超重低音箱EBX250A本身就是一套完整汽车音响系统。其由一个250mm的超重低音喇叭加箱体加内置300瓦的电子数码功放组成。内置功放可以高频输入,直接连接主机,内置300W大功率电子数码功放,安装极其简易。

简介：德克萨斯11月2日消息，世界最大的Wi—Fi无线网络接人服务提供商Waveport宣布它与Hertz(世界上最大的汽车租赁公司)签署了合作协议在世界超过50个机场地区提供Wi—Fi接入服务。Hertz是紧接

简介：ThetransientresponsetolongitudinalimpactofflexiblerodswithHertzcontactiscloselyrelatedtotheextentofdeformationswithdifferentimpactparameters.BymeansofLS-DYNA,fordifferentradiusanddifferentspeeds,thelongitudinalimpactofahammerwitharoundedendonadrillrodisnumericallysimulatedinthisarticle.Simulationsdemonstratethatthereisanobviousdif-ferencebetweenanalyticalsolutionandnumericalsolutiononconditionofshortcurvatureradius.Inthecircumstancecontactpressureincreases,theboundaryoftheyieldzoneexceedsthatofthecontactzone,andthesignificantplasticdeformationreducestheintensityofcontactpressurepulse.Contactforce-timecurvesinloadingandunloadingphasesshiftdown.Thenumericalsolutionisingoodagree-mentwithanalyticalsolutiononconditionoflargecurvatureradiusandimpactspeeds.Thedeforma-tionofyieldregionisconstrainedbythesurroundingelasticregionandnosignificantplasticdeforma-tionappears.

简介：

简介：Thispaperpresentsatheoreticalmodelonthenormal(head-on)collisionbetweensoft-spheresonthebasisofelasticloadingoftheHertzcontactforcompressionprocessandanonlinearplasticunloadingforrestitutionone,inwhichtheparametersallaredeterminedintermsofthematerialandgeometriconesofthespheres,andthebehaviorsofperfectelastic,inelastic,andperfectplasticcollisionsappearedintheclassicalmechanicsarefullydescribedonceavalueofcoefficientofrestitutionisspeci...