舰船主尺度参数对舰船气泡尾流几何特性的影响

为了解舰船主尺度参数对尾流中气泡分布的影响,为依据尾流特征识别舰船,激光、声探测舰船尾流以及鱼雷的尾流自导提供依据,采用热分层环境下舰船远场尾流中气泡数密度分布计算的数学模型.首先数值计算驱逐舰尾流中气泡数密度的衰减规律,并与实测结果进行比较,二者定性符合得较好.然后利用该模型数值计算3种典型舰船的气泡尾流几何分布特性,分析船长L、船宽B、吃水T、长宽比L/B以及长度吃水比L/T等舰船主尺度参数对气泡尾流长度、宽度、深度及横截面分布的影响规律.     

基于区块链的舰船通信数据防篡改模式研究

现有舰船通信数据存储模式存在易被篡改等缺陷,结合具备防篡改特性的区块链技术设计通信数据防篡改模式,构建该模式中的舰船通信区块链结构,通过区块链共识机制由所构建的舰船通信区块链中选取最佳区块,以分层数字签名的方式向最佳区块内加密上传舰船通信数据,完成舰船通信数据的加密防篡改存储。结果表明,该模式在上传舰船通信数据过程中,可保持平稳的签名加密与最佳区块选取运算开销,并有效避免各类篡改攻击,具有较高的防篡改性能。最终存储的数组舰船通信数据中,最高被篡改与缺失数据量的占比仅为0.004%与0.02%,存储数据的整体安全性与完整性较为理想,可为舰船通信数据的安全存储提供保障。     

舰船中压直流综合电力推进系统稳态分析研究

本文对舰船中压直流综合电力推进系统进行稳态分析。首先,根据舰船中压直流综合电力系统基本特点,选定直流分层前推回代法作为基本方法加以改进;同时,提出了适用于该方法的支路计算等效模型,并将上述思想进行程序实现。通过算例分析结果可知,论文所提出的基于直流分层前推回代法的潮流计算方法,能够适用于舰船中压直流综合电力推进系统。     

分层结构材料顺序对水中冲击波的影响研究

采用分层结构设计是有效提升现代舰船的抗爆炸冲击能力的一种方式。通过建立水下航行器的分层结构模型,采用高压下冲击波在分层介质中的传播理论模型,分析分层结构不同材料的合理排列顺序,并进行验证性的试验研究。研究表明,在为舰船或者水下航行器等装备设计分层结构时,在不影响整体布局的情况下,需重点考虑到材料的排列顺序。     

舰船目标ISAR成像研究

由于海浪的影响造成海上舰船运动形式复杂多变,因此要获取高质量舰船目标逆合成孔径雷达(ISAR)的图像非常困难。本文对基本的舰船目标运动模式下ISAR成像问题展开研究。首先分析舰船目标的转动模式,建立3种基本的转动形式的数学模型。研究距离-多普勒(R-D)算法在该运动形式下的ISAR成像。通过仿真实验证明R-D算法可以获取较高质量的小幅度舰船转动ISAR图像。     

分层结构材料顺序对水中冲击波的影响研究

采用分层结构设计是有效提升现代舰船的抗爆炸冲击能力的一种方式。通过建立水下航行器的分层结构模型,采用高压下冲击波在分层介质中的传播理论模型,分析分层结构不同材料的合理排列顺序,并进行验证性的试验研究。研究表明,在为舰船或者水下航行器等装备设计分层结构时,在不影响整体布局的情况下,需重点考虑到材料的排列顺序。     

我国舰船动力基础科研创新发展模式

通过对我国舰船动力基础科研现状的分析研究,对国外舰船动力基础科研和研发模式及其成功经验的综合分析,进行了我国舰船动力基础科研创新发展模式研究.从强化我国舰船动力基础科研创新发展模式着眼,在战略视域下研究提出我国舰船动力基础科研创新发展目标、方向、实施途径、发展措施等建议,研究可为国家实施舰船动力基础科研创新发展战略提供...     

基于WEB模式的舰船信息管理系统的设计和实施

分析和比较了信息管理系统(MIS)开发中的客户端/服务器(C/S)和浏览器/服务器(B/S)模式的特点,针对舰船的特点,设计了综合两种模式的基于WEB模式的舰船信息管理系统结构,并将该模式应用于实际的某舰使用维修信息管理系统中.     

舰船舷侧结构水下抗爆试验和机理研究

通过对舰船舷侧结构模型进行水下接触爆炸试验的破损情况的观测分析,研究了舰船舷侧结构在水下接触爆炸载荷作用下的破坏机理,分析了舰船舷侧典型防护结构的破坏模式.利用能量原理计算了舰船舷侧各层防护结构在不同破坏模式下的吸能率,从而揭示了舰船舷侧结构的抗爆机理,为其抗爆设计提供了理论参考.     

链路层舰船通信光纤网络被动数据存储方法研究

为了提高链路层舰船通信光纤网络被动数据存储的容量,提出一种基于分层融合机制的链路层舰船通信光纤网络数据存储模型。首先采用交叉分布式云存储结构模型构建光纤网络被动数据存储的数据库模型,在数据库中进行被动数据的聚类处理,然后根据聚类属性进行分层融合,对海量的舰船通信光纤网络被动数据进行特征压缩,从而提高存储空间的容量。最后进行数据存储的仿真实验分析,结果表明,采用该方法构建舰船通信光纤网络被动数据存储模型,数据库的吞吐量得到明显提升,同时提高了对目标数据的查准率和查全率。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。