隧道施工坍塌事故的致因相互影响关系研究

揭示隧道施工坍塌事故致因间的相互关系是实现对隧道施工坍塌事故有效预防的前提和基础。本研究建立了隧道坍塌事故致因指标体系,采用集成DEMETEL/ISM的方法揭示了影响隧道施工坍塌事故的关键要素,并划分了致因指标的层级结构。分析结果还指出管理方面的原因是导致隧道施工坍塌事故发生的主要动因。     

沙湾特大桥主墩船舶撞击力分析与计算

随着船舶运输行业的迅速发展,大吨位船只日益增多,船舶撞击构造物的事故不断增多,造成了巨大的经济损失。为了防止由于船舶的撞击而发生桥梁坍塌事故,各国学者依据各自的研究成果提出了很多船撞力的简化计算公式。本文结合工程实例,在对国内外现行的防撞设计计算方法进行分析与比较的基础上,根据工程情况选用合适的计算方法以控制设计。     

取料机悬皮凸缘联轴器优化设计

取料机悬皮驱动凸缘联轴器断裂会造成驱动平台坍塌,安全隐患严重。通过有限元应力分析,优化了凸缘联轴器的结构设计,减少结构的应力集中,并通过材料和加工工艺的改进提升了新联轴器的疲劳强度,避免断裂事故的发生,保障生产安全。     

锚机支撑结构局部强度两种直接计算方法对比

采用两种加载方式对某浮吊锚机基座及相关船体结构的局部强度进行直接计算,并对比分析两种方法所得的应力结果,结果表明,两种方法是应力结果差别较大,在应力水平较低时两种方法都可以用来计算校核基座及其支撑结构的局部强度;当应力水平接近许用应力时,建议采用MPC加载方式计算评估。     

基于奇异元计算分析裂纹尖端应力强度因子

采用两种奇异单元模拟裂纹尖端应力应变场的奇异性,建立了相应的计算裂纹尖端应力强度因子的ANSYS有限元模型。通过数值计算,分别考察了这两种有限元模型中裂纹尖端附近区域网格参数的变化对应力强度因子计算精度的影响,比较了应力强度因子对各个参数的敏感程度。发现采用20节点奇异元的有限元模型计算的应力强度因子几乎与网格参数无关,其计算结果更稳定可靠。该模型能够用于船舶及海洋工程结构中含裂纹构件的应力强度因子计算。     

油船碰撞事故的定量风险评估

统计资料显示,船舶(特别是油船)碰撞事故不仅造成巨大的经济损失,还是造成海洋原油污染的主要原因之一.定量风险评估技术作为风险评估方法的一种,可以科学预测事故发生的概率及破坏程度,近年来在船舶与海洋工程领域已引起广泛的关注.依据P.T.Pedersen碰撞模型,建立了船舶碰撞事故的数学计算模型,计算了船舶碰撞事故的发生概率;运用DNV风险评估软件Neptune分析了溢油的扩散情况,提出了减少船舶碰撞的措施.     

大型离心风机叶轮轴与轴承失效分析

探讨某火力发电厂风机事故原因，计算风机轴承在正常工作载荷下的使用寿命，用ANSYS软件对风机轴的应力与临界转速进行分析；结果表明，风机轴设计与轴承选用符合设计要求，风机事故的主要原因是安装时轴承箱对轴与轴承产生了附加载荷。     

“建设12”轮右5舱爆燃事故的调查与思考

对“建设12”轮的油舱爆燃事故进行了分析,指出了这起事故发生的原因是由于向空油舱注油引起的,同时,分 析了事故发生的有关其他原因,提出了预防和避免此类事故的措施。     

内河航道船舶碰撞与搁浅风险概率研究

针对我国内河航运发达,货物运输量大,事故多发的现状,从理论上建立了船舶碰撞与搁浅的数学概率模型,归纳了引起事故发生的原因并举例进行了计算,分析了不同因素对事故发生概率的影响,所介绍和使用的方法可以在不同的内河航道上使用,对于船舶航运、风险评估、航道管理具有现实意义。     

集装箱船大跨度舱口盖结构强度分析

本文给出了集装箱船大距度舱口平结构有阴元分析的两种不同计算模型，并对这两种模型计算结果进行分析比较。从而找出比较符合实际受力情况的计算模型，在分析计算此模型的基础上进行一步分析计算了高应力区域处构件的应力，并提出了对这些构件的加强措施。     

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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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.     

某海港码头的撞损修复

依据码头撞击受损区域调查检测结果,对受损构件提出合理的修复方案,为码头的安全运行提供保障。