有源滤波器复合控制策略的研究

传统PI控制存在缺陷,为了实现无差精确控制,本文设计了基于模糊自调整的广义积分控制策略,通过模糊辅助调整器来动态调节广义积分控制器的各个控制参数,使此电流控制器可以同时获得较好的动态性能及稳态性能。该控制方法有效地提高了系统的目标跟随特性、抗干扰性和鲁棒性,并且具有计算量小、容易工程实现的特点。仿真与实验结果验证了文中所提出的复合控制策略的有效性和可行性。     

船舶航向PID型模糊控制器研究

航速变化及由此引起的干扰使得船舶航向控制较为困难。基于常规max-min型Mamdani模糊控制器(fuzzy controller,FC),再增加积分项,将PD型模糊控制器与PI型模糊控制器相并联,构造了一种新的船舶航向PID型模糊控制器。该模糊控制器充分利用了常规PID控制器的设计经验来调节参数。不同航速下的5 446TEU集装箱船及"育龙"号实习船模型仿真结果表明,与常规PID控制器和模糊控制器的效果相比,不但航向设定值跟踪控制性能得到了保证,还具有更好的鲁棒性和抗干扰能力。     

船用核动力装置稳压器模糊自适应控制器设计

运用模糊控制理论,为解决船用核动力装置在强迫与自然工况转换时冷却剂回路压力变化波动较大的问题,提出一种自适应模糊PI控制器,即利用模糊控制器实现压力调节系统工作参数的在线优化整定.通过对某船用稳压器的仿真研究表明,本控制器在继承原有PI控制特点上,能有效抑制一回路压力波动,减少压力超调时间.     

基于模糊PI的冷凝器过冷度控制技术研究

论文简述了冷凝器过冷度产生的原因以及减小过冷度的方法,运用模糊PI的方法设计出冷凝器在不同工况下的过冷度控制器.通过仿真表明,模糊PI控制器较之常规PI控制器,对于冷凝器过冷度的控制性能更好.     

冷凝器真空压力模糊PI控制系统

分析冷凝器真空形成的原因以及影响真空稳定的因素,通过模糊PI的方法设计出冷凝器在不同工况下的真空压力控制器。通过仿真表明,模糊PI控制器较之常规PI控制器,对于冷凝器真空压力的控制性能更好。     

基于参数自适应方法的同步发电机双模糊逻辑励磁控制

为了克服常规PI和PI+PSS控制器在时变系统中的缺点,设计了一种新型的同步发电机参数自适应的双模糊逻辑励磁控制器,即基于同步发电机每个瞬间的速度偏差及加速度偏差,电压偏差及电压偏差的微分,按照相平面上的标准模糊隶属度函数构建双模糊逻辑控制器.运用Simulink分别对基于参数自适应的双模糊逻辑控制器和常规PI、PI+PSS控制器在同步发电机励磁系统中进行仿真,结果表明,基于参数自适应方法的双模糊逻辑控制策略在励磁系统中具有较好的控制性能.     

通用模糊控制器的研究与设计

对通用模糊控制器进行了研究与设计,其模糊控制用推理法实现,并且将PI控制结合进去以改善控制器的静态特性。文中着重讨论了模糊控制的软件实现方法,给出了通用模糊控制器的控制方案、硬件组成及主要的程序流程图。     

船用永磁同步电机参考模型自适应模糊控制研究

随着交流电机控制技术的快速发展,传统的船用电机PI控制无论是精度还是鲁棒性都已不能满足要求,而非线性间接参考模型自适应模糊控制,是通过在线实时调节自适应参数来满足被控对象的输出渐进跟踪参考模型的输出,以达到一定的控制性能。模糊控制并不需要被控对象的精确数学模型,利用模糊系统的万能逼近特性构造未知函数,再根据跟踪误差和误差变化率等信息,构造出被控对象的等效控制器。将其这些特性应用到永磁同步电机控制中,并采用Lyapunov稳定性分析理论设计出间接型自适应模糊控制器,对永磁同步电动机调速系统进行控制。仿真结果表明:系统在控制性能和适应性、鲁棒性等方面优点显著。     

同步电动机单参数模糊PID励磁控制器的研究

针对同步电动机,本文提出了一种简单、实用的单参数模糊PID控制的励磁调节算法.与传统的模糊PID控制器相比,该算法具有调节参数少、算法简单且易实现的优点.为证明其优越性,文中对此算法进行了仿真分析,仿真结果表明该控制方案无论在响应时间上还是在超调量的大小上都明显优于传统的PID控制器.     

水力发电机组从稳定状态到非稳定状态的频率特性研究

从PID参数变化对频率特性影响出发,利用劳斯稳定判据,分析了水力发电机组从稳定到不稳定状态的频率特性,并得出了相应的结论.实例分析表明,应用带阻滤波器对水力发电机组进行校正是一个有效的方法,将使水力发电机组获得良好的动态特性和调节品质.因而具有很强的工程实用价值。     

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.     

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.