基于近似模型的载重46 000 t油船阻力性能优化

以低速肥大型船的线型优化为研究对象,针对部分关键问题进行深入研究。将近似模型方法应用于船型优化工作,以使用有限数量的高精度CFD计算结果建立的近似模型来代替优化过程中复杂耗时的CFD数值计算,利用团队开发的船舶水动力性能多学科综合优化平台完成载重46 000t油船的线型优化,并进行验证。     

风电安装船线型设计及性能分析

本文针对当前市场所需的风电安装船的线型设计优化过程及试验结果进行了分析研究。论述了线型设计特点,分析了线型CFD优化过程,并且结合模型试验结果对目标船的快速性、操纵性、动力定位能力等性能进行预报,最后对目标船线型开发经验做了总结。研究成果为同类船舶及近似船舶设计提供参考。     

结合企业实践的CFD船舶阻力预报及线型优化

本文概述了研究课题——“CFD船舶阻力预报及线型优化”的理论基础，研究内容、实现流程及应用成果。该课题将现有CFD中理论上较成熟、工程上比较实用、计算精度较高的一部分内容，结合企业现有CAD资源、对企业产品进行分类，进行典型船型CFD船舶阻力及流场特性预报，并以此为基础进行船舶线型精细设计和优化设计，为船舶线型改造、新船型的开发提供帮助。     

基于CFD实尺2339标准箱集装箱船的阻力分析和实船验证

基于计算流体力学(CFD)方法对2339标准箱支线型集装箱船进行实尺数值模拟阻力预报。首先建立NUMECA/HEXPRESS全六面体非结构网格,采用湍流K-Omega(SST)-Menter模型进行数值模拟,计算其在压载工况下不同傅汝德数时的阻力;然后将CFD数值计算阻力结果同实船试航阻力进行比较与分析。结果表明:CFD数值模拟同实船以及实验结果趋势一致,误差较小。论文所述CFD分析方法对船舶的线型设计、优化和航速预报,具有一定的指导与参考意义。     

近似技术在船型阻力性能优化中的应用研究

船体型线优化过程中,通常要利用高精度的CFD软件对船舶的相关性能进行数值求解。这将耗费大量的时间,导致船型优化效率降低。为有效提高船型优化的效率,提出将近似技术应用于船型自动优化中,以代替CFD数值求解。探讨了样本点选取、样本集形成及近似模型实现途径等问题。以一艘1300TEU集装箱船的线型优化为例,构建船体兴波阻力的Kriging近似模型,并将其应用于球鼻首的优化中。计算结果表明,基于Kriging模型的船型优化是一种实用而且有效的方法。     

阿芙拉型油船线型设计与优化

以一艘阿芙拉型油船为研究对象,对其快速性能优化方法和详细过程进行介绍。采用将CAD(Computer Aided Design)软件CAESES与计算流体力学(Computational Fluid Dynamics,CFD)软件Shipflow相结合的方法对船舶线型进行多工况条件下的深入优化,分析对比有无球艏的艏部设计方案;同时,采用桨前节能导管提高螺旋桨的推进效率。快速性试验结果表明,对船舶进行线型优化和加装节能导管,能取得良好的快速性优化效果。经实船试航验证,优化后船舶的航速能超过试验预报的航速。     

基于近似理论和CFD的船舶线型优化研究

环保理念逐渐深入人心,船型优化对船舶节能减排具有重要意义。基于近似理论和CFD数值模拟方法,开展了集装箱船线型优化研究。研究结果表明:优化船型总阻力系数比原始船型减少约4%,验证了方法的有效性,可以为船舶设计提供支撑。     

灵便型散货船线型方案优化研究

使用软件FRIENDSHIP和SHIPFLOW对现有的灵便型散货船做线型优化研究,并通过船模试验进行验证。CFD计算结果表明,采用平驳型(barge type)后体有一定的减阻效果,此推断与船模试验结果相吻合,验证了软件计算的可信性。然后使用CFD软件对船舶前体线型作进一步的优化设计,大幅降低了兴波阻力,取得了较好的线型优化效果。     

船体绕流场及流噪声的CFD模拟方法

CFD数值模拟技术可以为船舶水下噪声水平和噪声传播提供高精度的预报,同时还可以洞察船体绕流场的变化。本文利用VOF方法与SSTκ-ω两方程湍流模型用于求解船舶非定常粘性流场,并结合FW-H方程进行噪声传播。基于Lighthill声类比理论,对不同球鼻首船型的噪声进行数值计算,对船体流噪声的空间指向性、近远场分布特性进行分析。计算结果表明,CFD技术可以用于模拟分析船舶的绕流场和流致发声问题,能够为低噪声船体线型设计提供参考。     

基于CFD的海工支持船纵倾优化

海洋工程支持船(OSV)因其船型特点,以一定航速航行时姿态较静止时的浮态会发生变化,进而会影响船舶的阻力。为减小船舶阻力,纵倾优化是一种非常有效的手段。首先运用CFD手段,通过对y+、湍流模型及网格依赖性等方面的研究,建立了适用于该类船型阻力计算的数值方法。在此基础上,对两型尺度相近,但不同线型的OSV进行了纵倾优化,数值模拟的结果发现纵倾优化在不同船型、不同线型、不同航速下而呈现不同的特点,为船舶实际运营中提供了指导。     

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.