舰炮供弹系统故障诊断知识本体建模研究*

针对舰炮供弹系统故障频发,故障诊断知识激增,传统诊断难度增大的问题,在对供弹系统故障诊断知识结构和语义特点分析的基础上,提出了一种基于本体的舰炮供弹系统故障诊断知识建模方法和表示模型。构建了包含供弹系统故障源、故障现象、参数指标、故障原因及排故措施五要素,由决策树连接的供弹系统故障知识本体。并应用推理机 Pellet对模型进行一致性检验。实例验证表明,该本体模型不仅表述直观、效率高,而且利于知识的共享和扩充。     

基于本体的舰炮故障树建模方法研究

论文提出了舰炮故障树本体的思想,并利用演绎法建立舰炮故障树模型,通过实例化的方法添加到故障树本体中.按照论文提出的方法,可绘制更多的舰炮故障树,使得舰炮故障树本体中描述的故障知识更加丰富全面,为舰炮故障树的应用提供知识基础.     

舰炮故障本体建模技术研究

论文根据舰炮及其故障的特点,研究了舰炮故障本体设计方法,提出将本体技术应用到舰炮故障描述中,运用本体工具Protégé和插件研制了一个工具,建立了相应的本体模型,最后运用OntoClean评价方法对建立的舰炮故障本体模型进行了评价,解决了舰炮维修过程中的故障描述信息不准确、不全面而导致的维修效率低下的问题。     

舰炮武器系统保障性神经网络评价模型及分析

针对舰炮武器系统保障性评价问题,根据其保障性内涵,运用BP神经网络,建立了舰炮武器系统的保障性评价模型,给出了研制阶段舰炮武器系统保障性定性与定量相结合的评估方法,克服了以往定性评价方法的模糊性和不确定性,能更准确地为舰炮武器的保障性设计提供依据。并以多种型号舰炮武器系统为例,对其保障性进行了评价。计算结果说明该方法可有效地用于舰炮武器系统的保障性评价。     

基于动态多实体贝叶斯网络的无人艇任务决策研究

任务决策是实现无人艇智能自主的关键环节,其存在着场景多样性、状态不确定性、约束动态性等问题。为此,本文提出动态多实体贝叶斯网络模型。首先设计了面向无人艇的语义推理框架,对无人艇本体信息进行知识表示。进一步,采用概率本体语言方法描述不确定性知识,同时扩展动态贝叶斯网络的结构,从而提高了无人艇任务决策在不确定性因素和时序因素影响下的推理能力。最后针对岛礁区域防守的任务场景,与多实体贝叶斯网络模型进行对比,结果表明DMEBN模型在动态条件下具有执行策略的连续性,验证了模型的可行性和有效性。     

基于贝叶斯网络集成的船用中高速发动机磨损故障诊断模型

为解决船用中高速发动机磨损故障特征模糊和信息不完备引起的故障诊断准确率偏低等问题,通过定期采集与发动机磨损故障紧密相关的各监测参数信息,建立基于专家知识和因果映射认知的磨损故障贝叶斯诊断网络结构,通过询问专家和运用贝叶斯方法进行诊断网络参数学习,完成基于专家知识和贝叶斯网络集成的船用中高速发动机磨损故障诊断模型的搭建。通过对母型船发动机实际故障案例进行仿真分析,验证模型的准确性和分析方法的有效性,取得较好的结果,可为快速、准确查找发动机磨损故障提供技术支持。     

舰船主冷凝器多连片贝叶斯网络故障建模方法研究

主冷凝器作为舰船蒸汽动力装置的主要设备运行中发生战损,故障模式复杂、不确定性较大,传统故障诊断方法难以有效解决。本文提出采用贝叶斯网络故障建模的方法解决这一难题,建立具有时间序列特性的动态多连片贝叶斯网络模型。通过实验分析表明模型准确可靠,不仅能够进行从故障原因到现象的正向推理,还能进行故障现象到原因的反向推理,可为蒸汽动力设备的故障诊断提供有效决策。     

舰船主冷凝器多连片贝叶斯网络故障建模方法研究

主冷凝器作为舰船蒸汽动力装置的主要设备运行中发生战损,故障模式复杂、不确定性较大,传统故障诊断方法难以有效解决。本文提出采用贝叶斯网络故障建模的方法解决这一难题,建立具有时间序列特性的动态多连片贝叶斯网络模型。通过实验分析表明模型准确可靠,不仅能够进行从故障原因到现象的正向推理,还能进行故障现象到原因的反向推理,可为蒸汽动力设备的故障诊断提供有效决策。     

贝叶斯统计在机电设备故障诊断中的应用

应用现代概率分析中的贝叶斯(Bayes)方法于机电设备故障诊断中。进行机电设备故障诊断的难点在于故障和征兆信息的随机性、模糊性和某些信息的不确定性。贝叶斯方法的基本特征是处理任何统计分析问题时,在利用样本所提供的信息的同时,也必须利用先验信息。本文研究表明,使用贝叶斯方法于机电设备故障诊断,给出的故障诊断结论和推断在理论上有较高的可信度,技术上可行。该方法不足体现在诊断结论强烈依赖于领域专家或诊断工程师的知识,先验概率即使能够给出其可信度的期望值也不会很高,并且征兆和故障之间的关系复杂,故障诊断知识库难以建立,独立性假设难以满足。     

模糊Petri网在某型舰炮系统故障诊断中的应用

用Petri网的变迁激活规则进行故障诊断推理,分析异常行为过程间的因果关系,根据变迁的可信度大小,找到一条最有可能产生已知故障的路径.以某改进型舰炮系统的一个实际故障诊断为例,针对其故障信息的不确定性和模糊性,给出模糊Petri网的故障诊断模型,结果表明该模型具有直观,知识表达能力强和易于推理的优点.     

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.