基于CFD流场分析的船用离心泵性能改进方法

鉴于某船用立式离心泵的原设计性能不满足使用要求,通过应用CFD技术对泵原设计内部流场进行数值分析,对原泵的压出室型体结构进行了优化设计。经CFD计算,原泵结构优化后的预测性能可以满足要求。利用优化后的泵体设计结果进行样泵的生产制造和整机性能试验,CFD的性能预报结果与样泵试验结果相近,可以满足性能要求,从而验证了基于CFD的流场计算方法在离心泵设计中具有较好的应用价值。     

基于CFD的KCS船舶艏部型线优化研究

为实现基于CFD船体型线优化设计,开发了船体型线优化平台,并以KCS船为初始船型,对其艏部型线进行了优化。首先,重点介绍了径向基函数插值的基本原理及其在船体曲面变形中的应用;其次,将该方法与CFD软件及优化算法结合,开发了基于CFD的船体型线优化平台;最后,将该平台应用于KCS船的艏部型线优化设计,获得给定约束条件下阻力性能最优的船体外形。研究结果表明:基于径向基函数船体曲面修改方法是可行的,建立的船型优化平台具有一定的工程应用价值。     

基于CFD的翼型水动力性能多目标优化设计

随着计算机技术的飞速发展,如何进一步发挥CFD在船舶工程优化设计中的作用,成为当前CFD应用研究的一个重点.文章通过集成CFD工具、优化算法和几何重构技术构建了基于CFD的构型水动力性能优化设计平台.以翼型作为优化对象,阻升比和尾流均匀度作为目标函数,采用Bezier曲线方法实现翼型几何表达与重构,利用DOE和NSGAⅡ算法对NACA0024翼型进行了多目标全局优化设计,获得了均匀分布的Pareto最优解集.结果表明该平台可以用于翼型水动力性能多目标优化设计.此外,文中的工作为进一步开展基于CFD的船型水动力优化设计打下了坚实的基础.     

基于计算流体动力学的最小阻力船型自动优化

基于计算流体动力学(CFD)理论,利用i SIGHT优化设计平台构建一种船型自动优化方法。该方法集成船型变换及自动生成技术、CFD技术及优化算法。优化过程中,编制船型参数化融合模块实现船型变换与SHIPFLOW软件输入数据间的自动连接;采用遗传算法与二次序列规划法相结合的组合优化方法实现从全局探索再到局部空间寻优的整个流程。以某双艉集装箱船为例,优化后船体兴波阻力明显下降,总阻力也得到显著的改善,获得了设计航速下总阻力最小的船艏与船艉线型组合,表明了该方法的可行性与有效性。研究显示,所提出的方法可以获得阻力性能优良的船体型线供设计者参考,具有较强的工程适用性,在基于CFD的船型自动优化方面具有广阔的应用前景。     

肥大型船模操纵性水动力CFD预报的试验验证分析

肥大型船操纵性水动力的预报不仅是肥大型船操纵性设计多方案选型及优化的基础,而且是水面船操纵性水动力预报中的难点.文章探讨了CFD在肥大型船操纵性水动力预报方面的应用能力和预报精度,并进行了系列模型的CFD计算与验证分析,结果表明所建立的肥大型船操纵性水动力CFD数值预报方法具有良好的精度和普适性.     

基于CFD技术的散货船线型优化研究

随着CFD技术的逐渐成熟,该技术已被应用于线型母型的选取和线型优化等设计流程中。依托"计算流体力学的实用化研究"项目,以17.5万dwt散货船为研究对象,应用CFD软件和优化软件来改进该船的阻力性能及伴流场。选取船体艏部三个特征参数和艉部两个特征参数作为优化变量并针对每个改型进行数值模拟,并将该船原型及艏、艉部分别优化所得线型进行模型试验,试验结果与数值研究方法的结论一致。     

基于CFD技术对2800TEU船的线型优化

基于CFD技术对线型优化是目前业界比较流行的做法。本文依托于实船2800TEU船项目,探索基于NAPA和CFD软件的一体化优化(传统经验模式)和基于CAESES和CFD软件的一体化优化(先进数值评估模式)的有机结合,以船模阻力系数为目标函数,对线型优化。结果显示,航速达到优化目标要求。     

一种新的曲面修改方法在船型优化中的应用

为实现基于CFD的船体型线自动优化,船体型线的参数化建模及修改起着至关重要的作用。论文提出了一种新的组合函数修改船体曲面的方法,该方法充分利用了融合函数及全局变换函数两类船体曲面修改方法的优点,实现了船体曲面的大范围变形,并保证了船体曲面的光顺性。将该方法与CFD技术及优化算法成功结合,直接应用于1300TEU集装箱船的型线优化设计,最终获得给定约束条件下的优化型线。结果表明,论文所提出的组合函数修改船体曲面的方法是可行的,具有一定的工程应用价值。     

基于高精度近似模型的舰船线型优化

线型优化是船舶总体性能设计的重要内容,借助CFD软件开展船舶线型优化需要进行三维建模和复杂的网格划分,时效性有限。本文提出一种基于高精度近似模型的线型优化法,在CFD计算结果的基础上,通过构建神经网络近似模型,对线型优化结果进行预报。该方法不仅能够实现线型优化结果的快速预报,而且可以解决CFD离散优化随机性的难题,大大提高线型优化的效率。     

基于CFD和响应面方法的最小阻力船型自动优化

计算流体动力学CFD方法凭借其较高的计算精度和获取更多流场信息的能力逐渐成为新船型设计重要手段.文章利用iSight多学科优化平台建立了一套船型优化系统,集成了CFD技术、船型变换及自动生成技术和响应面代理模型技术和组合优化算法.编制了船型参数变换和生成系统实现了船型变换和CFD计算程序Shipflow输入数据的自动连接;通过对主要船型参数的控制,实现整个船型优化流程的自动化.采用了进化遗传算法(GA)与二次序列规划法(SQP)相结合的二阶组合优化方法实现了从全局探索再到局部空间寻优的整个流程.同时,将响应面近似模型(RSM)引入到优化进程中,解决了计算精度与优化效率间的矛盾,使得高精度的CFD分析工具融入到船舶优化设计进程中成为可能.最后利用该系统对一条设计船的阻力性能进行了优化.     

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.     

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。     

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.