人工智能技术在船舶柴油机振动监测中的应用

传统船舶柴油机振动监测数据与实际柴油机振动参量存在一定的偏差,为了提升船舶柴油机振动监测数据的精准度,提出人工智能技术在船舶柴油机振动监测中的应用。在人工智能技术支持下,首先对船舶柴油机振动监测传感器结构进行参量校准;接着在感应数据标准值下对柴油机曲轴振动数据进行异常信号的分析处理计算;然后对分析后的异常信号源进行提取计算,完成对柴油机振动监测的全局计算。通过对比实验结果表明,提出方法具有提升监测值精准度的作用。     

基于传递矩阵法的船舶推进轴振动特性研究

船舶在航行过程中,通过推进轴系实现船舶发动与推进器之间的能量传递,并通过螺旋桨产生的推动力推动船舶行进。本文利用传递矩阵法进行船舶推进轴振动特性研究,首先利用传递矩阵法计算了船舶推进轴自由振动的计算,然后在此基础上利用扩展的传递矩阵法获得了推进轴强迫振动计算,得到整个系统的累积传递矩阵。最后进行仿真实验来说明本文算法的有效性。     

改装船舶总振动分析计算

以某船舶改装项目为例,采用迁移矩阵法对船舶在满载和空载状态下的总振动固有频率和振型进行计算分析.对改装后的船体总振动固有频率进行预报,为船舶改装结构设计和设备避振提供工程指导.采用的计算方法可为船舶总振动固有频率和振型的预报分析提供借鉴.     

散货船的总振动模态计算和动力响应预报

针对某散货船建立一维梁模型和混合有限元模型。在总振动计算的基础上,对3种不同的螺旋桨激振力的施加方式进行比较研究,计算其尾部及上层建筑的强迫振动响应,最后根据船舶振动基准进行振动评价。计算结果表明,该散货船的振动特性良好,对该类型船舶的振动和响应预报具有一定的参考价值。     

陀螺效应对船舶推进轴系回旋振动的影响

本文将陀螺效应应用到船舶推进轴系的回旋振动计算中,在轴系回旋振动几何模型的基础上建立有、无陀螺效应的计算模型,并给出轴系回旋振动时的临界转速。文章选取5艘已设计完成的船舶推进轴系为实例,采用两种计算模型分析各自的回旋振动临界转速。结果表明,陀螺效应提高了船舶推进轴系回旋振动的临界转速,为设计过程中精确确定轴系的转速禁区给出了依据。     

改装船舶总振动分析计算

以某船舶改装项目为例,采用迁移矩阵法对船舶在满载和空载状态下的总振动固有频率和振型进行计算分析。对改装后的船体总振动固有频率进行预报,为船舶改装结构设计和设备避振提供工程指导。采用的计算方法可为船舶总振动固有频率和振型的预报分析提供借鉴。     

船舶低频振动噪声的自主控制方法

在船舶航行过程中,由于设备长时间运行出现振动的情况从而产生噪声,严重影响设备的使用寿命,威胁船舶航行安全。为了有效解决船舶低频振动噪声,保障船舶平稳、安全的运行。结合振频离散峰值特征对船舶低频振动噪声的自动控制方法进行分析和研究,通过分析船舶设备振动频率范围,对船舶设备振动噪声控制算法进行完善,从而获得船舶振动噪声响应特征数据,并根据振动噪声计算结果对船舶设备低频振动噪声控制系统进行设计,以达到保障船舶设备运行稳定性,提高船舶安全的设计目标,最后通过仿真实验证实,船舶低频振动噪声的自主控制方法可有效控制船舶设备振动产生的噪声,保障设备运行的稳定性和安全性。     

船舶结构振动噪声时域预报方法研究

针对船舶结构振动噪声频域预报方法存在计算规模大、求解效率差和易出现"峰值遗漏"等现象的不足,本文基于波动理论,提出了船舶结构振动噪声时域预报方法,形成了船舶结构振动噪声时域预报方法流程,并辅以相应的数值验证.研究结果表明,船舶结构振动噪声时域预报方法可有效解决频域分析方法存在的计算规模大、求解效率差和易出现"峰值遗漏"等现象的不足,提高了预报效率和精度,可为船舶结构振动噪声预报评估提供方法支撑.     

船舶轴系扭转振动消减方法研究

船舶轴系是船舶推进系统的主要组成部分,轴系产生的扭转振动是引发船舶推进系统事故的重要因素之一。在分析了船舶轴系扭转振动产生的原因、计算方法以及减振措施之后,并以某型船舶为例,利用轴系扭振计算软件,研究了优化该船轴系扭振的措施。     

波浪扰动对船舶结构振动的影响

波浪扰动会使得船舶振动,继而会引起一系列连续的并且有一定强度的振动应力,这些影响会严重影响船舶结构的稳定性,并且会损害船舶结构,成为船舶航行过程中的危险隐患。本文的研究目标为大型船舶,讨论波浪扰动对大型船舶结构振动的影响,并且通过水池模型进行一系列的实验来对船舶结构振动的影响做对比分析。通过改变船舶的船型、重量分布、刚度等船舶的参数来观察波浪扰动对船舶结构振动的影响,结合理论计算及实验数据分析,得到船舶参数变化之后波浪扰动对船舶结构振动的影响的几点结论。     

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。     

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）.     

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.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

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.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。