简介：Theproblemofwaterwavescatteringbyathinverticalelasticplatesubmergedinuniformfinitedepthwaterisinvestigatedhere.TheboundaryconditionontheelasticplateisderivedfromtheBernoulli-Eulerequationofmotionsatisfiedbytheplate.UsingtheGreen’sfunctiontechnique,fromthisboundarycondition,thenormalvelocityoftheplateisexpressedintermsofthedifferencebetweenthevelocitypotentials(unknown)acrosstheplate.Thetwoendsoftheplateareeitherclampedorfree.Thereflectionandtransmissioncoefficientsareobtainedintermsoftheintegrals’involvingcombinationsoftheunknownvelocitypotentialonthetwosidesoftheplate,whichsatisfythreesimultaneousintegralequationsandaresolvednumerically.Thesecoefficientsarecomputednumericallyforvariousvaluesofdifferentparametersanddepictedgraphicallyagainstthewavenumberinanumberoffigures.

简介：BDS（BeiDouNavigationSatelliteSystem）是我国自主研制的新一代卫星定位系统,其应用技术对我国车辆定位产生重要影响.为了适应车辆对实时精确定位的迫切需求,提高基于BDS/GPS车辆定位系统精度及可靠性具有重大意义.本文设计了基于BDS/GPS的车载定位终端装置,该装置包括BDS/GPS定位模块、GPRS无线通讯模块、ARM9处理器,通过扩展卡尔曼滤波算法提高定位精度,实现亚米级（1米）定位,实验结果证明了该作品已基本满足要求.

简介：Mostoftheinvestigationsregardingfrictionstirwelding(FSW)ofaluminumalloyplateshavebeenlimitedtoabout5to6mmthickplates.InpriorworkconductedthevariousaspectsconcerningtheprocessparametersandtheFSWtoolgeometrywerestudiedutilizingfrictionstirweldingof12mmthickcommercialgradealuminumalloy.Twodifferentsimple-tomanufacturetoolgeometrieswereused.TheeffectofvaryingweldingparametersanddwelltimeofFSWtoolonmechanicalpropertiesandweldqualitywasexamined.Itwasobservedthatinordertoachieveadefectfreeweldingonsuchthickaluminumalloyplates,toolhavingtrapezoidalpingeometrywassuitable.Adequatetensilestrengthandductilitycanbeachievedutilizingacombinationofhightoolrotationalspeedofabout2000r/minandlowspeedofweldingaround28mm/min.Atverylowandhighdwelltimetheductilityofweldedjointsarereducedsignificantly.

简介：4月24日,长江南京以下12.5米深水航道二期工程（以下简称“二期工程”）通过交工验收,标志着南通（天生港）至南京（新生圩）227公里12.5米深水航道按设计标准提前半年全部建成,具备试运行条件.随着12.5米深水航道的上延,沿江港口群发展的基础条件发生深刻变化,航道深水化、船舶大型化、港口规模化特征日益明显.二期工程建成后,将实现国际远洋运输自长江口向内陆延伸400公里,南京港成为5万吨级海轮直达和10万吨级海轮减载进江的终点.

简介：文章结合对110米趸船钢引桥有限元直接计算的审图分析,阐明应用ANSYS有限元分析方法进行审图的过程及注意要点,对船舶审图工作的开展提供了新的解决思路。