IETM技术发展综述及其特点分析

交互式电子技术手册（IETM）技术是实现现代装备综合保障信息化的关键技术。在重点介绍分析美军IETM技术发展和应用过程的基础上,总结了其发展特点,并在说明现阶段仓库管理问题的前提下,提出了应用IETM技术的总体建议。     

重力辅助导航仿真演示系统设计与实现

为了形象直观地研究重力辅助惯性导航系统,用VC＋＋和MapObjects开发了重力辅助惯性导航仿真演示系统,它实现了组合导航的计算与控制、仿真轨迹动态显示和数据处理。文章对系统开发的总体框架,实现的主要功能和部分功能的具体实现作了详细的描述。     

电子装备战备完好率改进模型

以战备完好率评估基本模型为基础,结合电子装备维修的特点,从部队装备修复流程出发,提出了包含故障件更换、故障件修理以及申领故障件在内的改进评估模型,并做了模型推导。     

军民兼容卫导终端中基带处理影响分析

在军民兼容GPS接收机中,A／D采样速率取决于军码带宽,民用要求需进行抽取,以有效地节省硬件资源。对此着重分析推导了均匀量化对信噪比的影响、有效字长截取对载噪比和正交性能的影响,并给出了最佳截取方案。GPS卫星信号的实际接收机情况,表明结论正确,能在基本不改变接收机性能的情况下有效地节约硬件资源。     

Geochemical controls on distributions and speciation of As and Hg in sediments along the Gaoping (Kaoping) Estuary–Canyon system off southwestern Taiwan

Surface and box-cored sediments were collected along the Gaoping (formerly spelled Kaoping) Estuary–Canyon system and analyzed for As and Hg contents and speciation, ²¹⁰Pb-based sedimentation rates and various geochemical parameters to elucidate the mechanisms that control natural and anthropogenic inputs of As and Hg from the Gaoping (Kaoping) River (KPR). The contents of As and Hg in surface sediments ranged from 1.84 to 20.7 mg kg^− 1 and from 0.07 to 2.15 mg kg^− 1, respectively, in the estuary and canyon. The concentrations generally decreased from the lower river toward the mixing boundary and then increased toward the estuarine mouth, followed by a slight variation in the canyon. Both As and Hg concentrations correlated strongly with clay, total organic carbon (TOC), Al, Fe and Mn contents in estuarine sediments but not necessary the same cases for canyon surface sediments. The factor analysis of surface sediments shows that the first two factors, which account for 75.6% of the variance, may represent major roles of carriers (clay, Al and Fe–Mn oxides) and TOC in controlling As and Hg distributions, respectively. Accordingly, the spatial patterns of the enrichments of As (1.9–16.2) and Hg (1.8–30.8) with reference to the crust levels follow the individual element's distribution patterns, likely because of deposition variability following inputs from the river. The contents of mobile As and Hg correlated substantially with the contents of both metals that were extracted with 0.1 M HCl. In addition to the major pool in the residual fraction (65–87%), As was relatively abundant in Fe–Mn oxides/hydroxides, whereas Hg was abundant in the organic/sulfide fraction. The deposition and accumulation rates of As and Hg in the canyon clearly decreased as the depth of water increased. The depth distributions of both metals are likely controlled primarily by TOC and Fe–Mn oxides associated factors followed by a contribution from anthropogenic pollution. The metal pollution appears to have increased substantially around 1970, following the economic boom in Taiwan, suggesting that modern sediments in the Gaoping (Kaoping) Canyon were derived from the Gaoping (Kaoping) River (KPR).     

排队论在地空导弹系统作战评估中的应用研究

分析了排队论方法中的构成要素特点,论证了排队论方法解决问题的方法模型,运用排队论方法分析和评估地空导弹系统的预期作战效能。     

散货船船首总段整体吊装强度有限元分析

整体吊装是船舶建造中的一项重要工艺。考虑到30000 DWT散货船船首总段结构本身的复杂性及船厂的需求,整体吊装时的结构响应只能以三维有限元方法进行模拟。文中介绍了复杂结构有限元建模的方法,利用MSC Patran/Nastran软件,建立了船首总段的三维结构有限元模型,分析了整体吊装时的结构响应。根据其特点,提出了合理有效的局部结构临时加强措施,为整体吊装顺利完成提供了依据。实际施工结果表明吊装加强工艺是合理的。有限元计算分析的有关结果可用于指导船舶总段吊装方案的设计及优化,提高船舶建造效率。     

建造综合工程图在一体化设计中的作用

现代造船模式可归结为两个一体化,即壳舾涂一体化和设计管理一体化,而实现两个一体化的前提是一体化设计,为使两个一体化的途径有效的运作,建造综合工程图应贯彻于基本设计、详细设计、生产设计的全过程。建造综合工程图一般包括以下内容:船舶的基本信息;分段/总段划分图;大节点计划及搭载网络图;临时工艺孔布置图;精度布置图;总组脚手架及坞墩布置图;各区域总组方式;新工艺的实施范围及技术要求。建造综合工程图研究在基本设计和详细设计的介入可以大大降低前期设计对施工建造的不利影响,有利于从船厂总体的角度考虑问题,减少设计失误,有利于使设计更切合船厂的生产实际。有利于减少船坞周期,提高船厂造船总量和增加其经济效益。     

水下爆炸冲击波作用下加筋板结构动态响应研究

运用大型商业有限元程序MSC.Dytran数值模拟了水下爆炸冲击波作用下舰船底部板架结构的响应,采用一般耦合算法（General Coupling）模拟了流体与结构的耦合效应,在计算中考虑了材料的应变率强化效应,并将数值仿真结果与试验结果进行了比较,两者吻合较好。结果表明：合理的设置计算参数,有限元模型能够很好地模拟水下爆炸冲击波对舰船底部结构的冲击作用。在此基础上分析了板架的变形模式,加强筋在板架变形过程中的作用,以及板架最大塑性应变出现的位置。