鱼雷扩展螺旋机动搜索弹道设计

当不能准确掌握目标运动信息时,对鱼雷发射平台而言,目标位置散布于一定的区域之内。要提高鱼雷搜索捕捉目标的概率,可利用鱼雷航程远的特性,设计一种扩展螺旋机动搜索弹道,使鱼雷搜索范围尽可能地覆盖目标散布区域。基于这种设想,提出描述鱼雷扩展螺旋机动搜索弹道的参数和确定方法,并对这种弹道进行仿真和分析,得出其适用条件和不足之处。     

目标散布已知情况下鱼雷发现概率计算方法

在目标散布概率密度已知的情况下,根据声自导鱼雷的搜索手段和机动搜索弹道,计算其相对于目标散布中心点的相对弹道。利用微积分原理,通过仿真方法计算积分区域,并对被积函数进行数值积分计算,求解声自导鱼雷机动搜索弹道发现目标的概率。     

潜艇鱼雷发射初期弹道研究

阐述了鱼雷初期弹道的概念,重点研究利用动量定理和动量矩定理建立潜艇发射鱼雷初期弹道的数学模型。用Runge-Kutta法对鱼雷初期弹道进行仿真,并根据仿真结果分析了各种因素对鱼雷初期弹道的影响,从而得出发射鱼雷时各参数的最优值。     

不同发射参数下潜射鱼雷初始弹道建模与仿真

为研究潜射鱼雷发射参数设定对鱼雷初始弹道的影响,建立鱼雷初始弹道数学模型,对鱼雷在纵平面的初始弹道进行了研究,利用Simulink编程进行了仿真,得出在不同发射参数设定下弹道的袋深、最大超调量和到达设定深度所需时间.仿真结果表明,鱼雷横舵管制舵角和出管速度对鱼雷初始弹道都有影响,其中鱼雷横舵管制舵角影响较大,为进一步优...     

基于目指信息的潜射线导鱼雷尾转声制导方式研究

针对目指信息保障下潜射线导鱼雷远距离攻击时,采用线导+尾流自导鱼雷捕获目标概率较低的问题,提出当鱼雷越过目标推算航向线后将尾流自导转换为声自导的制导方式。介绍目指信息传输模型、目标运动假设模型、鱼雷曲线转向模型和线导+尾流自导推算前置点导引模型;提出一种鱼雷尾转声制导方式,分析目标推算航向线、尾转声时机、尾转声鱼雷航向和鱼雷到达目标散布中心后的机动搜索方案。通过仿真计算,分析了线导+尾流自导、线导+声自导和线导+尾转声等3种制导方式在不同初始态势下的鱼雷捕获概率,验证了采用尾转声制导方式兼具尾流自导鱼雷抗干扰能力强和声自导鱼雷捕获概率高的特点。     

舰艇摇摆对鱼雷初期弹道影响的研究

阐述了鱼雷初期弹道的概念,重点研究了在水面舰艇摇摆情况下利用动量定理和动量矩定理建立鱼雷初期弹道数学模型。用Runge—Kutta法对鱼雷初期弹道进行仿真,并根据仿真结果分析了舰艇摇摆对鱼雷初期弹道的影响。     

基于Simulink的飞航式火箭助飞鱼雷空中弹道仿真

为研究飞航式火箭助飞鱼雷空中弹道参数设计问题,首先分析其空中运动过程,根据空中弹道的特点,建立了纵向运动方程组。采用MATLAB/Simulink软件建立了仿真模型,并就发射倾角、雷箭分离条件等对空中弹道的影响进行仿真计算。本文的研究成果对飞航式火箭助飞鱼雷空中弹道设计及作战效能研究有一定的参考价值。     

声自导鱼雷追踪导引弹道分析

为提高声自导鱼雷发现目标后在追踪段的命中目标概率,根据鱼雷和目标的相对运动方程,采用数值分析[1]的方法,对追踪导引弹道进行分析,研究追踪导引弹道的性质,得到追踪导引弹道的益率半径极小值,并通过该曲率半径极小值与鱼雷旋回半径进行比较,判断鱼雷是否脱离理论轨迹,从而为使用者根据不同的条件提供适当的射击方案,占领合适的射击阵位,同时对鱼雷设计者进行鱼雷设计具有重要意义.     

火箭助飞鱼雷入水点散布误差综合分析

火箭助飞鱼雷的入水点散布误差是影响其射击效率的重要因素.根据火箭助飞鱼雷空中弹道的特点,从干扰因素的不同来源出发,分析了火箭助飞鱼雷入水点散布的主要误差源,讨论了其影响火箭助飞鱼雷射击效率的内外因素及作用规律,并据此对相关系统的改进或进行误差补偿提出了建议,对实际使用武器时有效地减小入水点散布误差,提高火箭助飞鱼雷的射击效率有一定的指导意义.     

舰载反鱼雷鱼雷齐射作战能力研究

分析了舰载反鱼雷鱼雷单雷射击作战能力的不足,提出了双雷齐射的作战使用方法.通过ATT作战能力模型的分析,建立ATT攻击弹道、自导检测、射击诸元解算、来袭鱼雷弹道及舰艇的规避模型.采用蒙特卡洛法进行研究,运用Matlab工具仿真计算,定量分析了射击距离、报警舷角及展开角对反鱼雷鱼雷拦截命中概率的影响.仿真结果对反鱼雷鱼雷作战使用研究具有一定的指导意义,同时为反鱼雷鱼雷的设计与研制等提供参考.     

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。