多通道频率测量模块设计

设计了一种用于柴油机转速频率测量的多通道转速频率处理模块.该设计结合了ARM处理芯片与Flash-CMOS结构FPGA芯片的优势,可以提高转速测量准确性和可靠性.该模块在实际运用中,达到了较高的精度并体现出优良的性能.     

PARYLENE真空涂覆后模块BGA芯片的返修工艺研究

Parylene真空涂覆是一种近年来国内用于材料表面防护的新工艺，由于其优异的表面防护效果正逐渐为越来越多的用户认可。但经过真空涂覆的电子电路模块由于表面有一层极薄的聚对二甲苯膜层，造成了其上的球栅阵列（BGA）等类型芯片的返工困难。为了解决这个问题，通过试验及数据分析，形成了独特的返修工艺。     

表面贴装技术中对印刷电路板的设计要求

表面贴装技术是第四代电子装联技术。要保证表面贴装技术中的焊接质量,必须重视印刷电路板的设计。根据我所引进的表面贴装技术设备的生产现状,对表面贴装技术中的印刷电路板的设计提出一些要求。概略介绍对印刷电路板的基准标准点设置、定位孔与组合板设计、贴片元器件布置以及布线与焊盘设计的要求。     

闭环消磁电流控制仪的设计与实现

为提高舰艇的磁隐身能力,利用ARM芯片和uC/OS-Ⅱ系统研制闭环消磁电流控制仪,并进行实验验证。实验结果表明,系统在实时性、结果精度等方面都达到了要求。     

基于DSP和FPGA的故障电流相控分断装置

文章介绍了故障电流相控分断的基本原理和方案;详细介绍了基于这种方案的相控分断装置的软硬件设计。装置以高性能DSP芯片TMS320F28335和现场可编程门阵列FPGA为核心,其中DSP作为主控芯片,FPGA为协处理器和执行单元,同时采用高精度ADC芯片AD7606来满足硬件设计要求;装置使用改进半波傅氏算法和自适应算法相结合的策略进行电流零点预测,提高了预测的准确性和快速性。实验证明装置具有良好的精确度、实时性和可靠性。     

智能低压直流断路器的设计

介绍了智能低压直流断路器的基本组成和控制系统方案.详细介绍了其核心部件智能保护装置的硬件设计和软件实现.装置以高性能DSP芯片TMS320F28335为核心,采用16位高精度ADC芯片AD7606采集模拟量,并进行了双机热备的容错设计和自诊断设计,有效提高了设备的精确度和可靠性.文中介绍了快速脱扣器驱动模块.针对断路器...     

利用TRIZ提高燃料电池增湿器的增湿能力

本文利用TRIZ创新方法提高燃料电池增湿器的增湿能力.通过TRIZ冲突分析、物质-场、"小人法"模型构建、分析与求解,获得8个解决方案,针对解决方案进行可行解的失效分析,最终确定两种组合解,并通过样机研制及试验证明其有效性.     

SMT表面贴装技术工艺应用与探讨

随着微电子和计算机等技术的发展,贴片元器件被广泛使用,这对电子组装工艺提出了新的要求。表面贴装技术SMT（Surface Mounted Technology）作为新一代的电子装联技术,已经运用于包括军品行业的各个行业,本文从实际出发,对表面贴装工艺流程中几个关键的工艺过程进行了分析和探讨。     

坞内船舶外板喷涂机器人多功能创新设计

采用专利挖掘策略的气泡图模型,分析了船体外板喷涂机器人的技术疏密区,进一步,引入积极参数和消极参数建立了改进TRIZ模型,进行了技术补充分析,获得了更加详细的功能。以专利分析结果中技术稀疏的漆雾回收功能为例,利用改进TRIZ模型,详细设计了增加真空罩防护等措施方案,并申请了专利,并将此方法推广到专利分析的其他技术稀疏功能。结果表明：通过建立一种基于专利分析与改进TRIZ的组合方法,可实现船舶外板喷涂机器人多方面功能的创新设计。     

一种高精度声呐波束发射系统的设计与实现

为解决传统声呐发射系统利用移位寄存器的冗余效应的设计方法所引起的精度不高问题,介绍一种采用DSP芯片与FPGA芯片结合设计的声呐发射系统的方法.该系统可同时产生多路信号,每路信号均可独立调节、设定,且各路信号可严格同步,并可按要求设定时延控制、循环发射等功能,各路信号间的延时精度可达200 ns,从而为波束发射系统的开发提供了一种新的思路.实践表明,该方法具有实现过程简单、精度较高的特点,适合于工程应用.     

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。