小水线面双体船稳定鳍装置航行试验研究

小水线面双体船(SWATH)是一种新型高性能船舶,文章对小水线面双体船的运动方程进行简单分析,对SWATH船稳定鳍装置进行实船性能试验,试验结果表明,稳定鳍装置调整船舶纵倾的能力满足设计要求,能够有效改善SWATH船纵向运动的稳定性。     

SWATH纵向运动稳定性分析与航行姿态控制研究

论文参考水翼艇运动方程对SWATH(小水线面双体船)纵向运动进行了理论推导,得出了特征方程。将该方程应用到了某型SWATH中,对该船光体的纵向运动稳定性进行了预报分析。结合空气动力学提出了稳定鳍的设计方法,并对稳定鳍和船舶光体耦合后的运动稳定性进行了预报分析。通过对两次预报结果的分析比较,证明了采用固定式稳定鳍调节SWATH航行姿态的可行性。     

鳍结构对SWATH船纵向稳定性及运动性能的影响

针对保持SWATH船纵向运动稳定鳍的结构尺寸难以确定的特点，从实船对鳍的展长和弦长取值的约束条件出发，利用计算机仿真出SWATH船在40kn的航速范围内保持纵向运动稳定的鳍结构尺寸的变化范围，然后，从这一范围内确定出不同航速且具有一定运动性能要求的鳍尺寸变化范围。以此为基础仿真出了对应于不同航速SWATH船在静水中的升沉和纵摇运动性能指标的变化范围。结果表明，此方法直观、有效，能初步确定稳定鳍尺寸并分析静水中鳍尺寸对SWATH船运动性能影响。     

SWATH船运动中断分析和减横摇控制器设计

针对SWATH船实航时产生的水平筛动问题,研究由横荡、横摇和艏摇的耦合运动产生的船舶运动中断(MII),提出设计SWATH船稳定鳍减横摇控制器,减小MII。通过理论分析MII产生原因和SWATH船稳定鳍工作时产生减摇作用的力和力矩特性,验证利用稳定鳍减小SWATH船横摇运动,抑制MII的可行性。在保证SWATH船升沉和纵摇运动的基础上,设计稳定鳍减横摇控制器,减小SWATH船横摇。仿真结果表明,控制器使SWATH具有良好的纵向运动性能,有效减小了横摇运动,抑制MII。     

小水线面双体船纵向运动稳定性的简化判据及分析

本文根据劳斯判据分析了小水线面双体船（SWATH）静水纵向运动方程的稳定性，给出了适合于工程应用的纵向运动稳定性简化判据和临界巡航速度的计算方法。通过对三艘SWATH的实例计算，讨论了船形以及鳍的尺度、纵向位置和组合形式的变化对纵向运动稳定性的影响，提出了一种较完善的提高SWATH纵向运动稳定性的途径。     

基于多目标遗传算法的SWATH船稳定鳍优化设计

针对稳定鳍的各参数对SWATH船纵向运动性能具有较大影响的特点,建立了稳定鳍的多目标优化模型,并运用基于Pareto解的多目标遗传算法对其求解.然后,以SWATH-6A为例对稳定鳍进行了优化设计.从仿真结果来看,在相同条件下优化得到的稳定鳍能使SWATH船具有更好的纵向运动性能.因此,本文的优化方法是合理的、有效的,有一定应用价值.     

小水线面船的运动稳定性

SWATH运动稳定性的分析计算在运动方程基础上进行。本文给出小扰动运动方程组。潜体产生的 Munk力矩是导致 SWATH纵向和横向运动稳定与否的重要因素。本文讨论了不带鳍的本体纵向稳定条件 ,以及稳定鳍在增稳和改善运动品质上的作用和优选方法。横倾运动稳定性初步分析时忽略相对高阶小量 Cn,特征方程自然去耦而分解成两个二次方程式 ,便于计算分析。通过目标船的实例分析 ,证明了鳍的作用不单是增稳且能改善运动品质。 Cnβ 是一关键导数 ,直接影响航向稳定性 ,甚至导致横甩。如应用导管螺旋桨将有利于改善稳定性。试验一再表明 :试验结果与计算结果的符合程度让人满意。     

小型高速SWATH船下体型线研究

根据帐篷函数法和切片理论分别编制了SWATH船的阻力、纵向运动理论预报程序,理论计算值与试验数据相一致.针对小型高速SWATH船主机置于下体后,下体型线的3种典型变化情况,理论分析了下体型线改变对SWATH船的阻力及纵向运动性能的影响,并对其做出综合评价.     

SWATH船纵向运动的鲁棒H∞控制研究

建立了SWATH船纵向运动控制系统的数学模型,并针对模型和外部扰动的不确定性,在SWATH船纵向运动控制中引入了状态反馈H∞控制方法;充分利用LMI(Linear Matrix Inequality)理论处理方法的优点对控制规律进行了优化。仿真结果表明,利用此方法设计的控制器对SWATH船所受到的外部扰动具有较好的抑制作用,能满足系统纵向运动性能的要求,具有一定的实用性。     

SWATH船纵向运动的分数阶PI~λD~μ控制

针对小水线面双体船(SWATH)的纵向运动稳定性问题,对某SWATH船设计了一种分数阶PIλDμ控制器。首先,在控制器设计过程中,引入ITAE准则获得分数阶PIλDμ控制器的优化参数,并以类似方式得到优化参数的最优PID控制器。然后,以SWATH船为研究对象,分别采用分数阶PIλDμ控制器和最优PID控制器对其等效Nomoto模型和考虑风浪干扰后的模型进行仿真研究。最后,对它们的控制性能及控制能量消耗进行比对分析。通过分析发现,本文所提出的分数阶PI~λD~μ控制器的控制效果明显优于最优PID控制器,且分数阶PIλDμ控制器更为节能。     

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.