大型豪华邮轮压载系统管路仿真分析

以某大型豪华邮轮的压载系统为研究对象,基于CFD方法,利用Flowmaster建立一维管路模型,采用理论公式计算对比软件建模仿真的方法验证压载泵特性参数的准确性,同时在考虑阀门开度和压载舱相对高度等特殊节点参数选择的基础上分析邮轮压载系统压排水时的水力特性规律。仿真结果表明,采用CFD方法仿真分析邮轮压载系统管路布置是合理准确的,规定时间内系统的压排水量以及节点支路流量的变化规律能满足压载系统的布置要求。     

大型集装箱船压载舱溢流保护系统设计和研究

减少船舶自重以增加货运量是现代造船的重要课题之一。对大型集装箱船的压载水和压载舱透气管路进行系统性优化,可以达到船舶减重、节约钢材和节能减排的目的。以某大型集装箱船为例,分别给出了货舱区域和机舱区域两种压载舱溢流保护系统的布置方案,并运用管路阻力公式计算出两种方案下压载水舱的设计载荷,结果显示优化减重效果显著。同时,还列出了两种方案的优缺点,对不适用的船只进行了说明。     

12000t举力下水驳压载系统设计介绍

主要介绍用于船舶或海洋工程构筑物平地建造后下水的12000t举力半潜驳船压载系统的设计及其特点,包括船舶概况、压载水舱的布置、飘浮状态进行平移装船作业的基本条件、在特定的装船作业条件下如何使船舶保持浮态和静力平衡的分析、压载水舱配载计算、压载泵和管路的设计、压载水舱透气系统的设置以及压载水舱配载调载的操作要求等。     

环长江口区域港口船舶压载舱淤泥对策浅析

针对在宁波、舟山等长江口区域港口卸货的大型油轮压载舱会沉积大量淤泥问题,从结构设计、管路布置和设备更新等几个方面提出解决方案,以期达到改进设计,减少压载舱内淤泥沉积,减少船东维护保养费用等目的.     

压载舱流水孔面积的核算方法

绝大部分船舶采用压载水系统来保持各种装载工况下的航行性能,压载舱流水孔的面积大小对压载水系统功能的实现有着重大影响.着重介绍了一种流水孔面积的核算方法.以某12500 DWT多用途船为例,通过分析实船的排压载过程,利用流体软件FLUENT进行仿真计算,得到不同情况下压载舱流水孔附近的速度和压力分布,从而优化压载舱内流水孔的设置.     

2500 TEU冰区集装箱船边压载舱空气吹泡系统的设计优化与吹泡试验

冰区船边压载舱防冻使用空气吹泡系统,旨在通过连续的压缩空气吹泡提供动能,防止最低冰面水线以上边压载舱水面整体结冰,保证压载泵能够正常抽吸舱内海水,防止干抽。本文针对2 500 TEU集装箱船第一次吹泡空气系统试验存在的问题给出了设计理论优化方案。同时当前项目给出了设备不做改动,只增加节流孔板的调试优化方案;通过试验确定进舱管路增加的节流孔板的大小,在空压机持续运转的情况下,验证所有边压载舱均正常持续地吹泡防冻运行,满足DNG GL Winterization Basic船级符号的要求。     

12000 t抬浮力打捞工程船沉浮试验分析

12 000 t抬浮力打捞工程船为一种集装卸和自航能力于一体的3岛式半潜船，沉浮试验与常规半潜船试验方法类似。文章通过压载舱透气管的特殊设计方案和优化压载舱压排载的顺序，尽量保证压载舱灌满或排空，减少自由液面，在主甲板全部入水、船舶初稳性高迅速减小的情况下，船舶保持正位，实现平稳顺利的下潜和上浮。     

船舶压载水系统仿真模型研究

船舶压载水系统包括压载水泵、管路系统和压载水舱等.本文根据离心泵的原理建立了压载泵流量模型;对管路网络中的流量、压力计算公式进行线性化,采用矩阵方法建立了压载水管路模型;以船舶的横倾角φ和纵倾角θ作为系统的控制参数,根据船舶的浮性及初稳性原理,利用小倾角稳性公式,建立了压载水系统的浮态计算模型;以某油轮为母型船进行仿真分析,结果显示应用此模型进行实船仿真能够使船舶在多种工况下保持平稳.     

压载舱的布置对FPSO破损稳性的影响

提出了两种不同的压载舱布置方案,对某FPSO在三种不同的货油装载状态及各种初始倾斜情况时,各压载舱独立破损后的破舱稳性进行了计算研究,比较分析了FPSO压载舱的布置对其破舱稳性的影响.结果发现:在任何情况下,不论舱室大小,与首尾压载舱室破损相比,边压载舱破损将会导致更低的稳性范围;边压载舱之间或首尾压载舱之间,舱室越大,破损后,破舱稳性范围越小.进一步对边压载舱的研究发现:当舱容基本相同时,导致稳性最差的舱室与初始纵倾和压载状态有很大关系.如无纵倾、货油装载量较小时,离首部最近的边压载舱破损将出现最低的稳性范围;货油装载量很大时,将出现在离尾部最近的边压载舱.     

船舶压载水系统仿真模型研究

船舶压载水系统包括压载水泵、管路系统和压载水舱等。本文根据离心泵的原理建立了压载泵流量模型；对管路网络中的流量、压力计算公式进行线性化，采用矩阵方法建立了压载水管路模型；以船舶的横倾角φ和纵倾角θ作为系统的控制参数．根据船舶的浮性及初稳性原理，利用小倾角稳性公式，建立了压载水系统的浮态计算模型；以某油轮为母型船进行仿真分析，结果显示应用此模型进行实船仿真能够使船舶在多种工况下保持平稳。     

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;     

33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 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;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

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。     

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.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

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）.     

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.