船舶自动舵控制系统实施改造的研究及实现

介绍了TS-75型自动舵系统的组成概况，分析了舵机抖动的机理，指出了该舵机抖动的根本原因是由于其控制电路的故障引起的，并提出解决该问题的有效方法是利用PLC（Programmable Logic Controller）技术对舵机控制系统进行改造。通过对船舶自动舵控制系统的控制原理、控制方法及存在的问题进行研究后，设计了基于PLC技术的自动舵控制方案，讨论了其具有的优点。利用PLC的模块化结构组态自动舵控制系统，实现船舶自动舵的自整定PID（Proportional Integral Differential）制，说明了STEP7 PID—TUNE的使用方法。基于PLC自整定PID控制的自动舵满足船舶的各种动态特性指标，能提高舵机控制系统的可靠性和经济性。     

大型船舶自动舵系统精准智能航向控制研究

为保持船舶在指定轨迹上航行,目前使用最为广泛的技术是船舶航向自动舵控制系统。基于航行安全和节约成本的考虑,船舶航行对自动舵的精确度提出了越来越高的要求。目前,通常采用船舶操纵运动模型研究船舶自动舵控制系统。通过分析船舶运动及其受到干扰力作用的情况,建立船舶控制系统数学模型。本文结合PID控制、模糊控制和粒子群算法,分析研究船舶航向自动舵控制系统。     

在线自整定PID控制的船舶自动舵

介绍了继电型自整定PID控制的基本原理及PLC实现的基本方法,设计了基于PLC的在线自整定PID船舶自动舵.该自整定PID自动舵能够自动适应船况和海况的变化,实现无扰动切换、变增益调节等功能,克服了舵机振荡.实船应用证明了该自整定PID船舶自动舵的有效性.     

在线白整定PID控制的船舶自动舵

介绍了继电型自整定PID控制的基本原理及PLC实现的基本方法，设计了基于PLC的在线自整定PID船舶自动舵。该自整定PID自动舵能够自动适应船况和海况的变化，实现无扰动切换、变增益调节等功能，克服了舵机振荡。实船应用证明了该自整定PID船舶自动舵的有效性。     

BP神经网络和PID船舶自动舵控制方法

船舶自动舵控制十分复杂,再加其它因素的干扰,使得单一神经网络或者PID控制无法对船舶自动舵进行高精度控制,而且船舶自动舵控制速度慢,为了改善船舶自动舵控制效果,利用BP神经网络和PID控制的优点,设计了BP神经网络和PID相融合的船舶自动舵控制方法。首先分析船舶自动舵控制原理,然后初始化PID参数的范围,并采用BP神经网络获取PID控制器的3个参数最优值,从而实现船舶自动舵控制,最后在Matlab平台实现了的船舶自动舵控制仿真模拟实验。结果表明,本文方法可以对船舶自动舵变化趋势进行很好的跟踪和控制,获得了高精度的船舶自动舵控制结果,而且船舶自动舵控制速度快,能够适合船舶自动舵的实时性变化特性,具有较强的抗干扰能力,具有一定的推广价值。     

船舶自动舵自适应神经网络控制算法研究

在我国船舶自动舵控制领域,其核心技术严重依赖于国外厂商,因此本文主要对船舶自动舵的工作方式进行研究。通过采用PID控制方法,建立精确的自动舵控制数学模型。在设计PID控制策略时,需要综合考虑外部非线性因素和时变不确定等影响,通过适度提高PID控制器中的反馈力度,能够显著提升自动舵的控制水平,然后针对反馈控制环节,设计自适应神经网络算法,对反馈控制参数进行自学习优化,进一步提升了船舶自动舵的预测能力。     

基于模糊控制原理的船舶自动舵设计

在现代船舶控制系统中,自动舵的运用给船舶的运输安全提供了重要的保证,但是由于自动舵系统具有非常复杂的时变和不确定性特征,传统的自动控制技术已经很难满足其要求,因此必须采用智能化的控制算法来实现自动舵系统的高效运行。本文通过建立精确的自动舵控制数学模型,结合模糊控制原理和滤波算法,实现了自动舵性能的提高。文中简要概述模糊控制的原理,给出了若干的仿真控制曲线,文末给出了自动舵的稳定性控制仿真曲线。     

在线自整定PID船舶自动舵的设计与实现

介绍了常规PID自动舵参数整定的困难,简述了继电型自整定PID控制的基本原理及PLC实现的基本方法,提出了基于PLC的在线自整定PID船舶自动舵的设计和实现方案,该自整定PID自动舵能够自动适应船况和海况的变化,实现PID参数无扰动切换、变增益调节、抗积分饱和、微分先行等功能,克服了常规PID舵机振荡等缺陷。实船应用表明,该自整定PID船舶自动舵的有效性。     

船舶舵机控制系统故障分析及其改造

分析了船舶随动舵工作原理和舵机振荡的原因,给出了舵机随动控制系统常见故障的解决办法.通过与半导体分立器件的对比,设计制作了采用集成电路的随动舵控制电路板,在实船应用中获得了良好的控制效果.     

基于反馈线性化的船舶自动舵动态滑模控制

针对船舶自动舵的航向控制问题,结合高阶滑模和动态滑模控制的设计思想设计了一种船舶自动舵动态滑模控制器.首先设计出包含舵机特性的船舶航向控制仿射非线性系统模型,其次通过状态反馈的方法将原模型变为等价的完全可控型线性化系统,然后设计出动态滑模控制器.仿真结果表明,所设计的动态滑模控制器不仅能很好的自动跟踪设定的航向,而且能有效的抑制系统的抖振现象,达到设计目的,为研究船舶自动舵控制提供一种参考.     

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

正~~     

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;     

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.     

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。     

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.