蒸汽减温管路改进

分析蒸汽减温管路的工作流程,构建蒸汽减温管路的模型。针对蒸汽减温管路存在的管路及阀门穿孔外漏问题,提出降低介质流速与控制饱和蒸汽湿度相结合的方案。仿真结果表明,改进后的蒸汽减温管路蒸汽品质得到改善,可为系统的设置提供依据和参考。     

蒸汽减温管路改进

分析蒸汽减温管路的工作流程,构建蒸汽减温管路的模型.针对蒸汽减温管路存在的管路及阀门穿孔外漏问题,提出降低介质流速与控制饱和蒸汽湿度相结合的方案.仿真结果表明,改进后的蒸汽减温管路蒸汽品质得到改善,可为系统的设置提供依据和参考.     

空气除湿技术在农产品干燥领域的应用研究

除湿干燥技术在农业工程领域有着十分重要的作用,是农产品生产加工和储存运输过程中的重要环节。近年来随着空气除湿技术的兴起,其在农产品干燥领域的应用也日益广泛。本文主要介绍热风除湿、冷却除湿、液体吸收除湿、固体吸附除湿等四种空气除湿技术的工作原理及其在农产品干燥领域的应用研究。     

谷物冷却机的使用和维护

1 结构和工作原理 谷物冷却机是制冷技术、通风技术、自控技术在谷物冷藏中的综合应用。谷物冷却机由制冷系统（压缩机、蒸发器、冷凝器、后加热装置、干燥器）、空气过滤器、离心风机、可编程控制系统、移动箱体等组成。其工作原理如下：向仓库内吹入经过冷却和湿度调节的适合所存放谷物特性的一定温度和湿度的空气,实现谷物的低温储藏。即被离心风机吸入的空气经过网滤滤去杂物,在流经蒸发器时进行热交换后被冷却,冷却程度按设定的出风温度自动控制。     

射流送风对地下景观内部湿环境的改善

为了解决某地下景观观赏玻璃内表面的结露问题,在原有混合通风除湿系统基础上,增加射流风口,引入环境低露点空气,并及时排除内部的湿负荷,使得玻璃内表面附近空气湿度下降.通过应用软件对该除湿系统进行了气流组织计算,从速度场的分布可以看出新系统比原系统有较合理的流场.并且运行一段时间后,玻璃下方空气的相对湿度有明显的降低,说明...     

转轮除湿技术在纸浆运输船上的应用分析

为保证海上干纸浆运输的安全性,对纸浆运输船除湿技术进行分析。结合纸浆运输船的布置特点,采用吸附转轮除湿系统作为纸浆船货舱除湿系统,该系统具有体积小、可靠性高、除湿量大、对货物无污染和能耗低等技术特点,其采用的固体吸附分离除湿技术可实现连续循环作业。对该系统的风管布置和设备维护管理特点进行分析,其采用集中处理和通风总管的布置方式有效节约空间和提高设备使用的可靠性,同时采用防火风闸和普通蝶阀串联的方式消除通风总管对货舱防火分隔和破舱稳性的影响。对货舱内的低密度干热除湿空气从舱底经过纸浆堆码空隙或气囊间隙上升流动的过程进行有限元模拟评估,优化计算出进风口和出风口的具体布置及风口流通面积,从而实现货舱内除湿空气的循环流动并达到最佳的除湿效果。采用温湿度传感器和可编程逻辑控制器(Programmable Logic Controller, PLC)实时采集和控制全船货舱的温度和湿度,实现对整个除湿系统的集中自动控制和管理。     

一次船舶中央空调故障特例

<正>某新造船上配套使用了某品牌船用直接蒸发式中央空调装置,投入营运后姊妹船在进入冬季制热运行时,先后出现蒸汽加热器散热管破裂蒸汽外泄事故。当时在投入加热运行时,发现住舱湿度很大,地板上有一层水珠,四壁呈湿漉状,检查蒸汽加湿器控制阀已经处于关闭状态,确认房间湿度大并非加湿过量引起的,同时发现空调器出风箱的风管接头及调风门处有水滴下落。停机打开空调器检查,发现蒸汽加热器有多根加热紫铜管破裂,大量的蒸汽向外溢出。破裂管全部位于加热器下部及靠近制冷蒸发器的位置,破裂口为局部凸起的爆裂状。     

嵌入式系统在舰船温湿度控制中的应用

目前研究的舰船温湿度控制方法控制过程损耗过多,控制耗时过长。为了解决上述问题,基于嵌入式系统研究了一种新的舰船温湿度控制方法,选用三星公司生产的TSD6382G8芯片提供控制电压,内部电路采用手动复位方式,利用嵌入式系统管理平台内部操作系统进行舰船蒸汽制冷,引入显示屏显示结果,通过数据交互实现温度控制。使用嵌入式系统的人机交互界面完成除湿工作,在进行冷却除湿过程中,需要对冷却空气进行传热,实现湿度控制。实验结果表明,将嵌入式系统应用在舰船温湿度控制中,可以很好地减少控制损耗,缩短温度湿度控制响应时间。     

船舶蒸汽伴行系统设计探讨

对蒸汽伴行系统设计和布置进行优化,可以降低蒸汽消耗,节约成本;可以简化操作流程,节省时间;可以提升燃油加热速度,提高船舶快速反应能力.本文对蒸汽伴行系统的设计计算以及布置要点进行探讨,以求最优标准化方案,为各型船舶的蒸汽伴行系统设计提供参考.     

膨胀土边坡抗滑桩数值模拟分析

以引江济淮膨胀土边坡为研究对象,以温度场模拟湿度场、建立温度场与湿度场等价转化条件,进而采用数值模拟方法研究膨胀土边坡吸湿膨胀变形机理、抗滑桩对膨胀土边坡的加固机理及抗滑桩在边坡上的最佳布置位置。取现场原状中等膨胀土并分别制成初始含水率15%(初始干密度1.45 g/cm~3)、初始含水率17.5%(初始干密度1.53 g/cm~3)、初始含水率20%(初始干密度1.60 g/cm~3)的三种土样,然后进行室内试验并获得土体普通物理力学指标参数及热力学指标参数。利用这些参数,进行不同土质条件下膨胀土边坡吸湿膨胀变形的数值模拟及有抗滑桩条件下膨胀土边坡吸湿膨胀变形模拟。计算结果表明,不同土质条件下随着降雨时间增长边坡土体变形均在增长,但膨胀土初始含水率大、干密度大,边坡土体变形较小;抗滑桩能够大大降低膨胀土边坡滑坡风险,抗滑桩布置在边坡中部时,膨胀土边坡的变形最小。     

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。