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北良港#3变电所所供电力变化较大,导致其功率因素极低,为此进行了改造,使用了磁控电抗器。介绍了#3变电所的概况。提出了改造要达到的目标,详细介绍了改造方案,作了经济性分析。这一方案达到了节能降耗的目的。 相似文献
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文中根据工程实践,对超高加筋土挡墙的稳定性进行了深入地研究。给出了针对高落差挡墙的设计方案,阐述了加筋土挡墙稳定性验算的方法和原理,系统地分析了加筋土挡墙的内部稳定性和外部稳定性,最后通过工程实例,验算了两阶超高加筋土挡墙的稳定|陛,给出了详细的计算结果,为加筋土挡墙的设计提供了理论依据和技术支持。 相似文献
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陶润元 《中国远洋航务公告》2008,(2):31-33
中远集团2008年安全生产工作电视电话会于1月4日隆重召开。总裁魏家福、党组书记张富生作了重要讲话,肯定了2007年的安全生产工作并提出了新的要求。张良副总裁在会上作了工作报告,全面系统地总结了集团2007年安全生产工作,认真分析了当前中远集团所面临的形势,指出了存在的问题和薄弱环节,提出了一系列的保障措施,部署了今年的安全生产工作任务。国家海事局刘功臣常务副局长到会并作了重要讲话,同时对中远集团安全工作给予了充分的肯定,提出了五点要求。 相似文献
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中国船舶重工集团公司技术档案馆历时四个月的保持共产党员先进性教育活动目前告一段落。活动总体上达到了先进性教育活动的目标要求,取得了四方面的成效:一是广大党员思想素质得到了新的提高;二是党组织的凝聚力得到了增强;三是推动了单位的改革和发展;四是坚持教育促发展,推动了向中央档案馆移交档案等工作的顺利进行,做到了“两不误,两促进”。 相似文献
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港口设备运行服务项目伴随着新的港口设备管理模式应运而生,并获得了成功实践。介绍了秦皇岛港采取的设备运行项目风险管理。介绍了风险管理的目标、机构和流程图,有效降低了项目现实和潜在风险,保障了项目的顺利实施。 相似文献
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The authors have already examined a method for evaluating the capsizing probability of a ship in the dead ship condition based
on a piecewise linear approximation of the restoring arm. Here, this method is extended to ships with trapped water on deck.
This is because the stability of ships having a relatively high bulwark, such as fishing vessels, could substantially deteriorate
due to trapped water on deck. First, the mean amount of water trapped on deck was estimated as a function of the significant
wave height and the mean wave period using a model experiment in irregular beam seas. Second, the restoring arm curve with
trapped water on deck was calculated hydrostatically and then approximated with a piecewise linear curve. Third, the roll
angle was estimated using a nonlinear and uncoupled equation of absolute roll angle under stochastic wave and wind exciting
moments. The short-term and long-term capsizing probabilities were calculated for a fishing vessel operating off Kyushu. Numerical
results quantitatively demonstrated that the effect on capsizing probability of trapped water on deck cannot be ignored when
accurately evaluating the stability of fishing vessels. 相似文献
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针对长甲板室纵向围壁端部与主船体露天甲板交界处的应力集中问题,采用结构有限元数值分析方法,探讨在空间布置受到限制的条件下,应力集中交界处圆弧型肘板臂长、圆弧半径等参数变化对应力分布和大小的影响,并得到降低应力集中系数的圆弧型肘板参数的最佳值。文中根据研究结果,对某艘实船的长甲板室纵向围壁端部与主船体露天甲板交界处圆弧型肘板进行优选设计,有效地降低了该处的应力集中水平。 相似文献
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本文在分析川江上游运输船舶现状的基础上,提出船型比选的原则,并阐述了对现有船型比选的思路和方法,最后介绍了采用VB开发的计算机比选程序。 相似文献
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在分析岸边集装箱起重机钢丝绳报废更换标准和各机构钢丝绳缠绕形式的基础上,对钢丝绳更换工艺的控制要点和重要措施进行了深入研究和探讨,并比较了新旧工艺的特点.实践证明,采用新的换绳工艺,可使钢丝绳更换效率大幅提高. 相似文献
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Vishwanath Nagarajan Dong-Hoon Kang Kazuhiko Hasegawa Kenjiro Nabeshima Toshihiko Arii 《Journal of Marine Science and Technology》2009,14(3):296-309
The influence of a rudder’s axial force on the prediction of full-scale powering performance of a ship is investigated in
this paper. Axial force characteristics of different rudder types were investigated by open water experiments. Viscous scale
effects on the rudder’s axial force were investigated by carrying out open water experiments with different sizes of rudder.
Experiments were carried out in the towing tank for a model ship fitted with different rudder systems to investigate the influence
of rudder’s axial force on full-scale propulsion performance prediction. Based on the experiment results, a new prediction
method is proposed for estimating full-scale power that considers scale effect on rudder’s axial force. Good performance of
the proposed prediction method is demonstrated by estimating the engine power of a ship installed with a special high lift
twin-rudder system from model experiments and comparing it with the values measured on the ship during full-scale experiments. 相似文献
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D.E. Pitfield 《Research in Transportation Economics》2008,24(1):5-14
The phenomenon of the wide world growth in low-cost airlines has resulted in a focus on their pricing strategies, on issues of cost recovery and on their impact on the traffic and market shares of legacy carriers or other low-cost carriers when they are in competition, either directly or at adjacent airports.This paper provides a brief overview of the characteristics of these low-cost carriers as well as their history and geography. It goes on to outline ways in which these carriers compete and manage demand, ranging from price competition to advertising; some of these methods directly reflect their special characteristics. Some empirical evidence is presented which indicates a correlation in fare setting behaviour between competitors and insights are offered on cost recovery.The impact of the start-up of low-cost carriers is also analysed, focusing on their impacts on other low-cost carriers. The case of Ryanair competing with easyJet on London-Venice is examined along with Southwest and Frontier on Denver-Las Vegas. 相似文献
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文章建立了S型铺管船的船体、托管架和管线动态耦合模型。考虑了海浪、风和海流载荷作用下以及动力定位系统的控制下,分析时域内管道对船舶运动和受力特点的影响。主要包括:建立起重铺管船的动力定位运动模型,建立基于碰撞-接触原理的V型托辊和托管架模型,设计具有PID伺服系统的张紧器模型,提供连接托管架和船尾的非线性弹性铰接模型。进行时域动态模拟得到结果,通过与非铺管作业工况下的运动响应的对比表明,管线对船舶横摇运动影响较大,对纵摇和垂荡运动有一定程度的影响;管道对船舶纵荡、横荡和艏摇三个自由度上的受力影响极大。 相似文献