船舶紧急制动新方法

基于增加船体或附体阻力进行紧急停船的方式,提出一种将船舶艉封板落入水中的新型船舶紧急制动方法。基于STAR-CCM+,运用平均雷诺数方程和Realizable k-ε湍流模型,对船舶采用这一制动方法时的阻力进行预报。与传统的制动方法预报阻力进行对比发现,新型船舶制动方法更为合理、有效,具有较强的工程意义。     

基于CFD的双艉客船阻力特性分析北大核心CSCD

[目的]随着绿色船舶规范的实施及推进,船舶能效指数,特别是船舶航速功率指标越来越受到业界的关注。为了精确获得双艉船型的航速功率指标及船舶流场信息,[方法]基于计算流体动力学(CFD)理论,提出一种双艉船型航行阻力预报及流场捕捉的工程方法。采用粘性流计算软件FINE/MARINE,对某双艉客船的航行阻力进行计算,探讨船舶第1层网格节点高度、船舶航速以及附体对计算结果的影响,并将不同航速下的阻力预报及其结果与试验数据进行对比。[结果]结果显示,预报误差基本在3%以内。[结论]研究表明,所提方法计算效率高且易于实现,预报精度能满足工程需要,具有较强的工程实用性。     

基于CFD的双艉客船阻力特性分析

[目的]随着绿色船舶规范的实施及推进,船舶能效指数,特别是船舶航速功率指标越来越受到业界的关注。为了精确获得双艉船型的航速功率指标及船舶流场信息,[方法]基于计算流体动力学(CFD)理论,提出一种双艉船型航行阻力预报及流场捕捉的工程方法。采用粘性流计算软件FINE/MARINE,对某双艉客船的航行阻力进行计算,探讨船舶第1层网格节点高度、船舶航速以及附体对计算结果的影响,并将不同航速下的阻力预报及其结果与试验数据进行对比。[结果]结果显示,预报误差基本在3%以内。[结论]研究表明,所提方法计算效率高且易于实现,预报精度能满足工程需要,具有较强的工程实用性。     

艉部先行模式下船舶冰阻力试验预报方法研究

在双向航行极地船舶的基本设计与线型优化阶段，需要对艉部先行模式下的冰阻力进行可靠的试验预报。吊舱与螺旋桨对艉部船-冰作用存在影响，但现有试验规程尚未合理考虑在该影响下船舶冰阻力的变化。以中国双向航行极地科考船“雪龙2”号为原型开展冰水池模型试验，对艉部先行模式下连续破除平整冰的过程进行了模拟。通过水上-水下联合摄录设备观测了船尾前冰层的破坏现象，并描述了螺旋桨对艉部船-冰作用的影响；结合艉部先行试验数据，提出了艉部先行模式下确定冰阻力的推荐方法，为艉部先行模式下的船舶冰阻力试验预报提供指导。     

船舶紧急制动方式之帆帘水止

基于增加船舶附加阻力进行紧急停船的方式,提出一种将船舶帆帘组释放入水中的新型船舶紧急制动方法。基于STARCCM+,运用平均雷诺数方程和Realizable k-ε湍流模型,对船舶采用这一制动方法时的阻力进行预报。通过和不释放帆帘组入水制动工况及主机倒车对比发现,新方案能够为船舶提供大量的阻力,使船舶可以快速制动。再通过计算各速度点下帆帘组内侧面载荷,发现帆帘组帆帘内侧面载荷远远小于现有消防水带材料工作压力,因此现有消防水带材料为新方案的实现提供了进一步可能。     

基于CFD的散货船纵倾优化研究

船舶阻力会随着航态的改变而改变。在航速和排水量不变的情况下,通过调节船舶纵倾进而减小航行阻力是1种可靠且通用性强的方法。文章以1万t的散货船为例,基于CFD数值计算仿真工具Fluent的k-ω湍流模型求解RANS方程组,验证Fluent仿真在船舶阻力计算方面的可靠性,并通过调节艏倾和艉倾,计算出相同航速不同纵倾角下的船舶阻力值,提出平浮并非是该船舶最佳航行状态的结论,对船舶实际运营提供指导。在此基础上,提出1种对Fluent进行二次开发以进行更高效船舶阻力预报的方法。     

基于CFD的双艉船型阻力数值预报

根据船体阻力成因和预报方法的讨论分析,提出一种应用计算流体动力学（CFD）理论进行双艉船型阻力数值预报的方法。该方法采用势流理论计算兴波阻力,基于粘性流理论计算粘性阻力。通过对某典型散货双艉船与液货双艉船在不同航速下的阻力预报及其试验数据的比对分析,结果显示,预报误差基本控制在4%以内。研究表明,该方法计算效率较高、易于实现、经济性较好,且预报精度能满足工程需要,具有较强的工程实用性。     

喷水推进装置至船体的载荷传递

推进和控制载荷必须从喷水推进装置传递到船体上。喷水推进装置产生的载荷通过艉封板传递到船体上是许多喷水推进装置的基本方式。为此，要求船舶设计师和建造厂对艉封板进行加强。最近船舶建造厂和喷水推进装置制造厂通过分析注意到这样一个事实，即艉封板的横向刚度很强，可以很容易地承受转向载荷，而对艉封板的前、后方向进行加强却很困难。相反，进水充道在前、后方向上刚性很好，因此它能够经常承受大部分的推进载荷。问题是大     

潜艇艉水平翼如端板的操纵性设计预报研究

潜艇艉水平稳定翼加断板（Ｈ型艉布局）可以显著地提高其垂直面的运动稳定性和机动性,从而也可以缓解水平翼超宽问题,因而该布局在新型潜艇的设计中受到青睐。本文对Ｒｉｌｅｙ＾「１」机翼端板的系列试验和Ｄｅｍｐｓｅｙ＾「３」潜艇艉水平翼的系列试验的数据进行了重新分析,提出了稳定翼有效展弦比的概念,并基于此概念,提出了一套简洁完整的半经验计算方法,可用于潜艇Ｈ型艉布局的操纵性设计和预报。与实际艇型试验结果的比     

基于数值模拟方法的深潜水作业支持船快速性综合优化

针对一型具有水下多种工程作业功能的3 000 m深潜水作业支持船这一大型复杂船型,基于数值模拟方法进行快速性综合优化研究。数值模拟船体艏部形状、艉封板高度及小尾鳍角度等变化,分析艏艉部线型的改变对船体阻力及伴流的影响。根据分析计算结果综合优化船体线型,预估船舶航速,并在水池对最终优化后的船型进行模型试验。结果表明:试验结果与数值预估结果吻合,验证了数值计算的准确性以及大型复杂工程船型线综合优化设计思路的正确性。     

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。