施工船舶抛锚作业对海底管道的影响研究

抛锚作业可能会撞击海底管道,这是一种偶然发生的事件,海底管线因碰撞而发生损坏是其面临的主要安全威胁。但是这对于该管道的安全运行造成了一定的破坏与影响。文章中分析了抛锚作业撞击海底管道后所采取的相关措施,以及抛锚作业撞击海底管道的机率,为进一步探讨提高探究海底管道在偶然发生时所带来的影响。     

基于AIS数据的抛锚撞击海管频率分析

针对船锚坠落撞击管道的频率问题,基于南海AIS数据对船舶的抛锚作业进行分析,利用DBSCAN算法对船舶抛锚位置进行识别和聚类分析,通过海域划分网格法分配不同集群对应的抛锚作业频率,采用蒙特-卡罗方法计算船舶锚泊对海底管道的碰撞概率,实现对船舶抛锚作业对海底管道碰撞频率的定量评估,建立船舶抛锚作业对海管碰撞频率的计算模型,结果表明,该模型能够基于不同区域的历史AIS数据,提供船舶在不同地点的抛锚频率,进而定量预测船舶抛锚作业对海底管道的碰撞频率,为海底管道的防护措施制定提供依据。     

基于能量法的跨航道海底管线抗落锚实验研究

随着跨航道海底管线应用越来越普遍,航道、水港等海域的抛锚作业对海底管道带来的安全风险问题越来越引起人们的关注。文章针对海底管道堆石保护方法,通过模拟实验研究了抛锚作业过程中海底管道的应力状态,并对其进行了损伤分析。通过绘制不同影响因素下管道变形的对比曲线,研究了覆盖石材、抛锚速度、埋深等因素对管道损伤的影响,并基于正交试验原理分析了不同影响因素对海底管道响应的敏感性。结合标准DNV RP-F107中的能量计算方法研究了不同影响因素对海底管道响应的工况,分析得出管道的最小推荐设计埋深。     

基于蒙特卡洛法的抛锚撞击海管概率分析

针对船舶抛锚撞击海底管道事故频发,撞击概率计算过程较复杂且适用范围有限的问题,对现有方法进行改进,基于蒙特卡洛方法建立抛锚统计试验模型,对某一条件下船舶抛锚对海底管道的撞击概率进行计算,结果表明:对现有方法进行改进或利用蒙特卡洛方法能较好地反映船舶抛锚对海底管道的撞击概率变化特性,可应用于危险区域的抛锚预警和海上禁锚区的设置。     

基于有限元法的海底管道埋深计算

基于有限元分析程序ANSYS/LS-DYNA分析应急抛锚贯入海床的动态响应过程,并分析不同锚重、水深、抛锚高度、海底底质等因素对锚在海床中贯入量的影响,最终确定锚机影响作用下管道的最佳安全埋深。     

抛锚操作与事故预防

从抛锚准备、船速控制、抛锚操作、抛锚方法选择等关键环节阐述实际操作要领、注意事项及事故预防,避免因设备缺陷、操作不当和疏忽大意等原因造成设备损坏、断链丢锚,甚至船舶碰撞事故。     

抛锚拖曳影响分析及海底石油管线防护

文章对船舶抛锚拖曳的影响进行了力和距离分析,并就海洋石油勘探开发中海底石油管线的安全防护,提出了防护措施和建议。     

大型施工船舶临近海底管道抛锚作业安全措施

本文结合浙江嘉兴(平湖)LNG应急调峰储运站项目码头工程,距泊位最近距离仅158m处存在三条海底输油管线的情况,阐明施工船舶抛锚作业如何避开海底管线,采取的安全控制措施,为类似工程施工提供参考。     

从在菲律宾Villanueva港丢链事故谈深水抛锚注意事项

抛锚作业是船舶最常见也是最关心的作业之一,若处置不当往往会出现这样或那样的问题,特别是深水抛锚。本文从一次在Villanueva港发生的深水抛锚丢链事故,谈深水抛锚方法及注意事项。     

抛锚碰擦球鼻的预防和防止

本文介绍在总体设计时防止抛锚碰擦船首球鼻的计算方法，以预测和防止事故发生。     

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.