一种基于实时预测算法的船舶姿态控制器设计

在船舶研发和改进过程中,研究减摇设备是重要课题之一。传统减摇设备的滞后性导致其不能有效避免波浪引起的船舶侧翻等灾害,故本文设计一种基于实时预测算法的船舶姿态控制器。将不规则波分解为大量规则波叠加建立波面模型,分析波倾角并建立船舶的传递模型。基于卡尔曼滤波算法设计船舶的横摇预测系统,再以减摇鳍为核心设计姿态控制器,最后进行模拟仿真。结果表明,预测系统预测结果准确,预测值误差较小,姿态控制器减摇效果良好,浪向角120°下横摇角被控制在5°以内。     

基于细菌觅食算法的船舶舵减横摇PID控制器设计

为解决传统舵减横摇PID控制器在外界环境变化时,控制参数不能实时调节,导致减摇效率降低的问题,将细菌觅食算法(BFO)与传统的PID控制结合,设计基于细菌觅食算法的船舶舵减横摇PID控制器(BFO-PID控制器),将船舶的实际船体参数引入到船舶横摇运动控制系统中,通过仿真实验对比船舶在加入BFO-PID控制器前后船舶横摇角的变化,分析改进后的控制器对该型船舶舵减横摇的适用性,实验表明,运用改进后的舵减摇控制器,船舶在不同遭遇角下均具有较好的舵减摇效率,证明控制器改进的有效性,细菌觅食算法提高了舵减摇控制器的鲁棒性。     

船舶舵减横摇H∞鲁棒控制系统

研究了船舶舵减横摇鲁棒控制系统设计问题。根据船舶运动和流体力学原理,指出了舵上产生的横摇力矩及船舶航向(艏摇)与横摇的分频特性,是舵-航向/横摇综合控制技术的基础。提出广义输出干扰的概念,将舵减横摇控制系统广义对象的奇异控制问题转化为非奇异标准控制问题,给出了艏摇/横摇耦合运动的线性分式变换模型和广义对象状态空间实现,设计了舵减横摇H∞鲁棒控制系统,并用结构奇异值理论对所设计的系统进行了鲁棒稳定性和鲁棒性能分析。通过数字仿真,证明所设计的控制系统具有良好的减摇控制效果和鲁棒性。     

移动重块式船舶减摇系统研究

船舶在风浪中会产生横摇,有效控制横摇可以提高船舶航行的安全性和经济性.移动重块式减摇系统具有机理简单、控制灵活的特征,对于不同的海况和工况具有很强的适用性,但对控制方案的安全性和最优性有较高要求.本文选择模型预测控制方法MPC构建控制器,成功实现了满足约束条件的最优化控制.案例船模的水池减摇试验充分验证了MPC控制器的有效性和优越性,对移动重块减摇系统的工业应用具有重要借鉴意义.     

PID控制器在船舶减摇水舱控制器设计与优化的应用

减摇水舱控制系统中的摇摆台控制一般采用PID控制系统,借助PID控制系统的算法优势,传输摇摆角度信号,有效控制减摇。PID系统采用免疫遗传算法,该算法能够建立起数学模型,推理运算出目标函数值,向电液伺服阀输出动作指令,控制船舶横摇。本文分析了PID控制器在船舶减摇水舱控制器设计中的应用,提出优化PID控制器的设计方法,经过仿真实验证实,改进优化的变参数PID控制器能够有效控制船舶横摇角、鳍角速率,提高减摇效率。     

基于硬件在环的舵鳍联合减摇实验系统设计

针对在实验室条件下如何验证船舶舵鳍联合减摇控制器性能和效果的问题,设计并构建基于Matlab/Simulink环境下的硬件在环仿真实验系统。该系统采用实际装备中的控制器,并在控制器中编写船舶航迹保持控制算法及舵鳍联合减摇的最优控制算法,利用实际的物理信号进行实时通信,完成半实物仿真实验,结果表明,该实验系统能够实现舵鳍联合减摇的模拟仿真,舵鳍联合减摇控制算法有效可行。     

基于模糊滑模理论的水面航行器减摇控制

水面航行器运动控制系统中存在很多不确定因素,难以对其建立精确的数学模型,针对这一特点,将模糊滑模算法运用到水面航行器减摇控制中,使控制器保持滑模算法对参数摄动和外界扰动不灵敏、反应迅速和鲁棒性强的特点.同时,引入模糊控制对滑模控制器的抖振进行优化,减弱对舵机和鳍机的机械磨损.在充分考虑舵角和航速等约束条件下,设计分离型舵鳍联合减摇模滑模控制器,进行Matlab仿真对比研究.仿真结果表明:设计的模糊滑模控制器能使船舶具有良好的航向保持和减摇效果,同时,系统抖振相比单独使用滑模控制器明显减弱.     

基于遗传算法的减摇鳍-被动水舱综合平衡系统最优控制器研究

综合减摇鳍与被动减摇水舱2种减摇装置的优缺点,采用一种优良的全航速下的减摇方案-减摇鳍-被动水舱联合综合减摇装置,在此基础上建立船舶-减摇鳍／水舱系统的数学模型。针对系统数学模型的复杂性,并考虑实际应用,采用遗传算法进行了PID控制器参数的寻优。同时,结合实船进行仿真,对仿真结果进行了分析。分析结果表明,基于遗传算法设计的综合系统控制器可以满足系统要求,为综合系统的实际应用提供理论依据。     

基于FDLQR的喷流舵船舶航向横摇控制研究

本文探讨了目标船在随机海浪干扰下的喷流舵减摇控制问题。首先,介绍喷流舵流体动力特性,并通过内插值获取理想线性控制输入。将水面船舶4自由度非线性耦合模型简化为3自由度直航线性模型,并针对单舵舵减摇控制问题,提出基于线性模型的分频线性二次型最优控制方法,构建了航向/横摇综合控制仿真数学模型。最后,在不同工况进行喷流舵控制对比仿真研究。结果表明,喷流舵在航向/横摇控制性能上可以获取更优的效果。设计的分频线性二次型最优控制器具有较强的性能跟踪能力,并兼顾到控制成本。基于该控制方法的喷流舵控制对实际船舶航向横摇控制,尤其在低航速航行时的控制具有重要的参考价值。     

大型船舶横向非线性减摇自适应控制系统

传统船舶横向非线性减摇控制系统使用PID模糊控制器,在随机复杂海浪情况下横摇角恢复慢,减摇控制效果差,因此设计一种大型船舶横向非线性减摇自适应控制系统。系统硬件设计中设计了整体硬件架构,并针对减摇鳍的构造与船舶行驶特征设计工作流程,调整角度实现减摇;软件设计中,利用改进的无模型自适应控制方法嵌入到系统中,引入混沌遗传优化算法增强自适应能力,增强控制效果。为验证设计系统的控制效果,设计实验,设计系统的减摇率为24.67%,与传统系统相比提高了7.34%,说明设计系统减摇控制性能更优越。     

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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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。     

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.