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IHO国际海道测量数据传输标准(S-57)自颁布以来,极大地推动了电子海图的发展。但随着时间的推移和科技的进步,S-57的局限性愈来愈明显,为此,IHO建立了通用海洋测绘数据模型(S100),并开发了基于S100的电子海图产品规范(S101)。本文主要对基于S101与S57的电子海图产品做个简要的比较,为大家了解电子海图产品今后的发展方向提供参考。 相似文献
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随着计算机技术的不断发展,在船舶导航领域,电子海图技术的应用越来越广泛,并逐渐取代传统的纸质地图。电子海图与地理信息系统相结合,能够为舰船提供精确的定位信息和导航信息,同时也能提供信息查询、存储等功能。S-57数据标准是电子海图的关键标准,本文首先介绍电子海图显示平台的基本组成,然后针对S-57数据标准的数据模型和拓扑结构进行分析,重点介绍电子海图显示平台中地理位置信息的坐标转换和船舶航迹信息的查询等功能,对于改善传统的电子海图显示平台有重要的意义。 相似文献
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本文介绍了电子海图生产现状,同时对国内外现有的S-101电子海图生产系统进行了分析,提出了不同的建设方案,并进行了分析比较。 相似文献
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面向S-57电子海图显示与信息系统的研制开发 总被引:1,自引:1,他引:0
我国已研制成功并决定正式生产和使用S-57电子海图。此文针对当前我国缺少S-57国际标准电子海图的实用显示与信息系统,使用visualC++6.0和CARIS ENCX商用控件,研制开发了电子海图显示与信息系统,能有效地实现显示、水线设定和查询等多项功能。 相似文献
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对S-57电子海图数据的读取以及分层显示技术进行了研究.目前在以电子海图为基础的航海信息系统开发中,一般是利用第三方提供的开发引擎,存在多限制、灵活性较差等缺点.通过对S-57格式电子海图数据模型以及结构的研究,采用STL对系统电子导航海图进行封装,实现对电子海图数据的读取;利用GTK技术和OpenGL技术实现电子海图的显示. 相似文献
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介绍了电子海图有关标准的背影,根据最新的标准阐述了电子海图显示和信息系统的基本功能,并着重讨论了其中的数据管理功能。 相似文献
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金属疲劳裂纹扩展率曲线与S-N曲线之间的关系 总被引:3,自引:0,他引:3
目前有两种不同的理论用于预报金属结构的疲劳寿命。一种是基于S-N曲线的累积疲劳损伤理论,另一种是基于裂纹扩展率曲线的疲劳裂纹扩展理论,如果都把一个构件的最终断裂作为疲劳破坏的定义,则S-N曲线和裂纹扩展率曲线均是反映金属在疲劳载荷作用下的基本材料特性。尽管在过去这两种曲线是分别测试的,但它们之间应该存在一些相互关系。本文的主要目的就是讨论它们之间的关系。基于S-N曲线的一个一般表达式和裂纹扩展率曲线的一个有代表性的表达式,本文建立了两种曲线之间的一个正式关系,这表明只需要测试一种曲线,而另一种曲线就可以根据已有的试验结果导出。文章以一个中央裂纹平板作为例子,演示了如何根据一种曲线推导另一种曲线。 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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《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,(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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Lynne Zeitlin Hale Mark Amaral Abdulrahman S. Issa B. A. J. Mwandotto 《Coastal management》2013,41(1):75-85
Site-based projects were initiated in Chawka Bay-Paje, Zanzibar, and Nyali-Bamburi-Shanzu, Kenya, to demonstrate the benefits of an integrated coastal management (ICM) approach for addressing coastal issues such as tourism development and enhancement of resource-dependent village economies in eastern Africa. A two-year, multidonor project used three primary strategies to make rapid, but sustainable, progress toward ICM. These included using interagency government teams for ICM planning, adopting an internationally recognized framework for ICM as a project ''road map,'' and explicitly incorporating capacity-building strategies into all aspects of the project. Within two years, integrated ICM action strategies, prepared through participatory processes, were being implemented at both sites, and both teams were working to expand the scale and scope of ICM in their nation. More importantly, the project helped create committed, capable, interagency groups that continue to work together to address urgent ICM issues. 相似文献
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This paper presents a simplified method for the reliability- and the integrity-based optimal design of engineering systems and its application to offshore mooring systems. The design of structural systems is transitioning from the conventional methods, which are based on factors of safety, to more advanced methods, which require calculation of the failure probability of the designed system for each project. Using factors of safety to account for the uncertainties in the capacity (strength) or demands can lead to systems with different reliabilities. This is because the number and arrangement of components in each system and the correlation of their responses could be different, which could affect the system reliability. The generic factors of safety that are specified at the component level do not account for such differences. Still, using factors of safety, as a measure of system safety, is preferred by many engineers because of the simplicity in their application. The aim of this paper is to provide a simplified method for design of engineering systems that directly involves the system annual failure probability as a measure of system safety, concerning system strength limit state. In this method, using results of conventional deterministic analysis, the optimality factors for an integrity-based optimal design are used instead of generic safety factors to assure the system safety. The optimality factors, which estimate the necessary change in average component capacities, are computed especially for each component and a target system annual probability of system failure using regression models that estimate the effect of short and long term extreme events on structural response. Because in practice, it is convenient to use the return period as a measure to quantify the likelihood of extreme events, the regression model in this paper is a relationship between the component demands and the annual probability density function corresponding to every return period. This method accounts for the uncertainties in the environmental loads and structural capacities, and identifies the target mean capacity of each component for maximizing its integrity and meeting the reliability requirement. In addition, because various failure modes in a structural system can lead to different consequences (including damage costs), a method is introduced to compute optimality factors for designated failure modes. By calculating the probability of system failure, this method can be used for risk-based decision-making that considers the failure costs and consequences. The proposed method can also be used on existing structures to identify the riskiest components as part of inspection and improvement planning. The proposed method is discussed and illustrated considering offshore mooring systems. However, the method is general and applicable also to other engineering systems. In the case study of this paper, the method is first used to quantify the reliability of a mooring system, then this design is revised to meet the DNV recommended annual probability of failure and for maximizing system integrity as well as for a designated failure mode in which the anchor chains are the first components to fail in the system. 相似文献