滑行艇喷溅阻力特性模型试验研究

通过开展棱柱型滑行艇喷溅阻力的模型试验研究,提出了一种滑行艇喷溅阻力的计算分析方法.试验选取4组不同初始纵倾角τ=1.5°,2.2°,3.0°,5.0°,每个纵倾角对应2个吃水,分别为:τ=1.5°时吃水dA=37.3,27.3 mm;τ=2.2°时dA=58.0,38.0 mm;τ=3.0°时dA=58.0,48.0 mm;τ=5.0°时dA=73.0,53.0 mm.每个吃水下的航速分别为1,2,3,4,5 m/s共计40种工况.通过在艇底布置压力传感器测量航行过程中受到的水动压力,同时采用高速摄像机拍摄的视频捕捉航行过程中的喷溅区域和滑行面,开展滑行面压力传感器数据的处理分析,确定了滑行艇滑行面的阻力特性,在此基础上采用间接法完成了滑行艇喷溅阻力的分析计算.结果表明:高速滑行状态下,滑行艇的喷溅阻力约占总阻力的22%~35%.     

钝体滑行艇喷溅阻力计算方法研究

基于计算流体力学软件FINE/Marine对钝体滑行艇喷溅阻力特性进行了研究.对底部为直线、外凸和内凹斜升型3种钝体在静水约束模式下,取纵倾角τ=3. 0°,航速V=2. 0 m/s,横向斜升角β分别为5°、10°、15°、20°时,进行了水动力性能数值计算和分析.通过编写喷溅区域参数的后处理程序,对喷溅区节点进行网格重构,得到不同横向斜升角下钝体喷溅面积和喷溅阻力.     

槽道滑行艇快速性数值仿真

滑行艇在滑行状态的航行往往伴随着浸湿面积及纵倾角的变化,导致其快速性性能难以评估.为此,本文基于全结构化动态重叠网格求解运动姿态,引入六自由度模块,采用Level-Set水平集方法求解自由液面,对某型槽道滑行艇进行快速性数值仿真.最终,得到了滑行艇在各个航速下对应的阻力、纵倾角、自由液面波形、中纵剖面气液分布以及船底压...     

水气双重介质共同作用下滑行艇纵向运动预报

为探究滑行艇水气双重介质共同作用下的运动响应情况,针对喷水推进滑行艇的高速运动原理,建立水气双重介质作用下滑行艇非线性的纵向运动数学模型。分析滑行艇在水气双重介质共同作用下滑行过程中的受力特性,确定艇体受到的重力、浮力、动升力和风压阻力等,改进受风面积和风压力臂的计算方法,提出实时计算滑行艇浸湿长度的计算公式。编写滑行艇纵向运动预报程序,并对不同工况下滑行艇运动的预报结果予以了分析。结果显示,当主机输出功率一定时,计入空气比不计入空气时的航速下降5.1%,升沉量下降0.006 m,纵摇角抬升0.2°,阻力增加1 893 N,动升力减小404 N;而计入风的阻力对滑行艇的运动影响较大,航速下降15.3%,纵摇角增加0.6°,升沉量下降0.021 m,动升力下降1 139 N,阻力增加5 472 N。     

重心纵向位置对滑行艇阻力性能的影响研究（英文）

高速滑行艇姿态和阻力的准确预测对于提高船舶水动力性能具有重要意义。为了研究重心纵向位置对滑行艇阻力和水动力性能的影响，验证CFD方法的适用性，本文采用动态重叠网格方法进行CFD数值模拟，采用有限体积法求解湍流模型为SST k-ω的雷诺平均方程，水气两相流的自由界面采用VOF方法捕获，给出并分析了不同速度下三个不同重心纵向位置的结果比较。不同重心纵向位置情况下的数值结果比较表明：下沉和纵倾角随XCG的减小而增加，同时导致润湿面积减少；当重心纵向位置向后移动时，水动升力使滑行艇更容易进入滑行状态。     

倒V型槽道滑行艇船型的水动力性能研究

考虑到高速航行时常规双体滑行艇阻力较大且艇体兴波严重,以及三体滑行艇独特船型所带来的优异快速性和兴波小等优良水动力性能,文章借鉴三体滑行艇的工作原理并应用于双体滑行艇,创新性提出倒V型槽道滑行艇的概念,并进行艇型结构设计和CFD水动力分析。模拟计算结果表明该艇型具有高航速时阻力增加缓慢和纵倾角变化平缓等优点。     

高速滑行艇喷溅特性研究方法

为了研究高速滑行艇喷溅特性,基于商业CFD软件FINE/MARINE开展了三维滑行艇模型三自由度运动性能的实时数值预报,完成了航速V=2～7 m/s,重心距离艇尾38.1%L、35.1%L共计12种工况下滑行艇的水动力特性、运动性能与航速之间关系的计算,并与试验数据进行了对比,二者吻合良好。将艇体表面的流体特征信息(速度场、压力场和水气体积分数等)导入自编的后处理程序,对艇体节点空间坐标重新生成非结构网格,给定喷溅的判断条件,自动识别和处理艇体喷溅区形状及喷溅阻力构成,论文提出的喷溅处理方法为揭示高速滑行艇喷溅流动内部机理及防飞溅结构形式设计奠定了基础。     

多航态高速无人艇阻力试验研究

为了研究多航态高速无人艇在不同吃水航态下的阻力性能以及运动特性,在半潜到水面航态范围内变换6个吃水状态进行模型阻力试验,试验速度涵盖排水航行到滑行状态范围,对每个吃水工况下的航行姿态、阻力性能进行分析研究。结果表明,该多航态高速无人艇在一定吃水范围内都有着较好的阻力性能以及良好的运动姿态,在中低速(Fr?2.0)条件下,该模型在不同吃水下的运动姿态、阻力性能随航速的变化趋势一致,但在高速滑行(Fr? 3.0)条件下变化趋势有差异;剩余阻力占总阻力的比例Rr/Rt随着吃水的增加而不断增大,在相同吃水条件下Rr/Rt随着F r?的增加呈现出先增大后减小的规律。     

拖曳力对滑行艇航行性能影响的试验研究

为了研究滑行艇作为高速拖曳水面搭载平台的可行性,通过模型试验方法对滑行艇在静水和波浪中的阻力性能及航行姿态变化情况开展研究,分别在非拖曳与拖曳2种工况下进行试验。在静水条件下,研究了滑行艇在不同航速时的阻力及航态变化,讨论了拖曳力对航行性能的影响。在规则波条件下,对滑行艇在排水状态和滑行状态,以及不同波长、不同波高的情况下进行模型试验,讨论了拖曳力对阻力平均值、纵摇、垂荡以及首部加速度的影响程度。通过试验结果对比分析,总结了拖曳力对滑行艇阻力及航态的影响规律,并提出了滑行艇作为高速拖曳水面搭载平台时的建议。     

高速双体滑行艇加装水翼试验研究

双体滑行水翼艇是一种集双体滑行艇和水翼艇为一体的复合型高速艇,通过双体船增加艇自身横向稳性及其耐波性。在双体滑行艇两片体内侧增设滑行水翼面,在运动过程中,航速达到一定值后,水翼的水动效应为艇体提供一定的升力,使艇体上升,减小艇底湿面积及其阻力,使双体滑行艇阻力大大降低。双体滑行水翼艇兼备了双体滑行艇和水翼艇两者优点,双体滑行水翼艇综合解决了高速艇稳性和快速性问题,使艇的技术性能得到很大的提高。     

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.