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宛宁 《船舶设计技术交流》2009,(3):38-43
多年来,叶轮式流量计在许多领域得到了较多的实际应用,其工作原理比较简单,概括的讲就是应用流体动量矩原理测量流量的装置。叶轮的旋转角速度与流量成线形关系,测得旋转角速度就可测得流量值。目前叶轮式流量计的研究重点仍然集中在流量的采集与流量曲线参数校正上,不论采用无磁还是有磁传感器,对其流量曲线的校正都是相当麻烦和困难的,功耗与可靠性均达不到理想的效果,制造难度和成本也较高。应用LC9723-IC芯片解决上述问题是目前较好的方法。 相似文献
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本文以船用通风系统空气流量测量为基础,介绍一种新颖的差压式流量计,阐述了该流量计的工作原理、基本结构、性能特点和安装方法,对应用过程进行了分析,对应用的效果进行了总结。突出了该流量计在船用流量测量中的优势和应用前景。 相似文献
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科里奥利质量流量计原理及其应用 总被引:2,自引:0,他引:2
本文介绍了科氏力质量流量计的工作原理,并推导证明了科氏力流量计测量的质量流量大小仅与传感器左右检测信号的时间差成正比,而与其他参数无关;还介绍了如何选用及安装质量流量计。 相似文献
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采用理论分析、仿真计算和试验测量相结合的手段,对现有高压空气放空质量流量计算方法进行评估.首先分析传统计算方法的根源和适用模型,并在计算程序中增加对亚音速流状态的计算.然后用Flowmaster软件对与船舶接近的主要高压放空工况进行建模计算.最后首次采用科氏力质量流量计测量了这几种放空工况的真实质量流量.对3种方法的结果分析表明:科氏力质量流量计可用于可压缩流高速流动工况的试验测量,采用Flowmaster计算出的质量流量曲线能更加接近试验测量曲线. 相似文献
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《舰船科学技术》2013,(9):118-122
虚拟计量是基于计算机系统和油气水多相流体力学的数字化测量技术,其核心原理为:通过普通的通信协议和控制系统,获取井筒、水下采油树、水下管汇和海底管道上压力、温度信息,综合目标油气田流体的特性参数,建立目标油气田的多相流体在井筒、油嘴和海底管道内的多相流数值计算模型,通过对质量、动量及能量方程的求解,获得各个油气井的单相产量。水下虚拟计量技术既可以用于水下油气田产量的计量,也可以作为在线多相计量装置的参考评价系统,从而大大节省水下油气田开发费用。目前这一技术已经应用在国外油气田开发中,我国崖城13-4气田首次在国内应用这一创新技术。该技术在满足生产需求的同时,大大降低了海上油气田开发投资。 相似文献
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《船舶与海洋工程学报》2014,(1):126-126
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. 相似文献
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《船舶与海洋工程学报》2014,(2)
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. 相似文献
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《船舶与海洋工程学报》2014,(4)
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; 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
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。 相似文献
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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. 相似文献
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《船舶与海洋工程学报》2014,(1)
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. 相似文献
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《船舶与海洋工程学报》2014,(2)
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. 相似文献
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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). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
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. 相似文献