共查询到19条相似文献,搜索用时 109 毫秒
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正确选取集装箱接地压力,直接关系到集装箱堆场投资的大小,以往,设计人员均按集装箱堆放层次的总重量由底层四个支点传给地而。这样设计的堆场投资大,安全系数偏高。 相似文献
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堆场是专业煤炭码头最重要的组成部分之一,通常采用分货种、分货主的垛位堆放策略,由于煤炭品种比较多,堆场的垛位大小和数量都处在动态的变化中。针对专业煤炭码头物流系统仿真建模中的问题,提出了堆场网格化建模方法,并结合实际专业煤炭码头进行仿真建模和试验研究。结果表明网格化建模方法可以更准确、更细化地描述码头堆场的动态变化过程。 相似文献
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当今世界物流中集装箱化的主导地位正在不断增强,但是散杂货物流市场势力不仅没有退缩,反而在强劲扩大;散杂货物流甚至是选择和落实新建工厂地段的重大因素。最近,德国ThyssenKrupp钢铁公司决定拆资29亿美元在美国开办钢铁厂,就是不知道美国一个州最合适德国人开办的钢铁厂,向来办事认真谨慎的德国人在美国公开招标。消息一经传出,美国有许多州积极参与激烈竞争,其中最有希望成为德国ThyssenKrupp公司钢铁厂所在地的是两者均位于美国南部濒临墨西哥湾的罗易斯安那州和亚拉巴马州;由于两者地理优势差不多,于是所谓散杂货物流市场机制是否成熟将是德国钢铁制造商在美国落实新钢铁厂选择地址的重大因素。美国罗易斯安那州政府官员向德国钢铁制造商介绍该州拥有占地3000英亩的散货堆场可以为德国ThyssenKrupp公司钢铁厂提供理想服务,因为该堆场就靠近密西西比河,可以停靠75000-80000载重吨大船,而且距离墨西哥湾不远,与新奥尔良相距仅仅60英里。而美国亚拉巴马州政府官员告诉德国钢铁制造商 相似文献
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分析钢板入库作业流程及堆放原则,建立钢板入库决策模型,以优化堆场空间利用率及电磁吊行驶时间为目标,针对该问题寻优过程的复杂性特征,采用遗传模拟退火算法求解。与传统人工决策方案相比,该优化结果可以提高堆场利用率,缩短入出库作业时间。 相似文献
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为了减少钢板在堆场的翻板量,实现精细化钢板物流管理,对船厂入库钢板如何安排堆放的问题进行了研究.首先分析船厂月钢板需求量分批次入库分配的过程,结合堆场堆存现状及钢板的出入库计划建立数学模型,在此基础上,采用遗传算法对数学模型进行求解,并运用VB.Net计算机语言进行编程.实例表明钢板分配策略能大大减少钢板在堆场作业过程... 相似文献
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国际航运的发展使港口堆场空间的需求不断上升,港口土地资源愈发紧张。针对如何在港口内部有限堆场面积的前提下显著增加集装箱的堆存容量和降低倒箱率的问题,研究堆场立体式堆场新模式——采用立体货架堆放集装箱。围绕该模式对码头装卸工艺进行设计,并与其他装卸模式下的场地利用率进行对比分析。结果表明,基于该模式研发的装卸工艺,优化和改进了现有堆场系统,提高了堆存容量,减少翻箱率,从而实现港口生产和经营的高效化。 相似文献
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This paper addresses a highly researched area, the reshuffling problem in ports, using a new paradigm-modified containership service order in light of credit risk assessment. Container stacking and reshuffling operations can cause ship delays and additional risk. In deep-sea terminals, outbound containers are tightly stacked according to the retrieval sequence. Due to lack of space, terminals stack containers in multiple tiers. This means any delay in the arrival of a ship can impose extra handlings and reshuffling of containers delaying future cargo handling. This paper addresses the reshuffling problem with a concept similar to the credit scoring and rating of creditworthiness used in the banking industry. By utilizing this comparison to the banking credit risk concept, a heuristic estimation model is proposed that illustrates the side effects of unscheduled modifications in containership service order. Further, the mega-ship trend amplifies the reshuffling debate. Probability of delay, reshuffles given delay, and call size at delay are introduced as the three-point risk metrics of the model. Numerical simulations illustrate the functionality to develop terminal stacking strategies as well as emphasize the mega-ship phenomenon and its side effects on terminals (i.e. yard operation deadlock). 相似文献
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日照港散货堆场的装卸工艺,主要有“堆取分开”和“堆取合一”两种形式。从建设成本、占地面积、使用性能等三个方面来看,各有优缺点。根据日照港的设备选型情况,对两种布置形式进行比较。 相似文献
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应用GIS技术,研究开发了一套港口散货堆场图形化管理信息系统,成功应用于广西防城港20万t级矿石码头,取得了良好的效果. 相似文献
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散装水泥船水泥滑移附加倾侧力臂分析 总被引:1,自引:0,他引:1
散装水泥的颗粒大小、堆装形式和休止角等与普通大宗散货(如煤、黄砂、砂石等)不同,其滑移特性对稳性存在不利影响。对散装水泥船的水泥滑移进行了研究,提出了滑移附加倾侧力臂计算方法,为保障内河散装水泥船的稳性安全提供了确实可行的方法。 相似文献
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Tiago A. Santos 《Maritime Policy and Management》2017,44(7):859-881
A novel methodology is developed for determining the characteristics of a cargo roll-on/roll-off (ro-ro) ship and the fleet size required for a given short sea shipping route. The ship and required fleet size to satisfy the transportation demand (for each pair of speed and freight rate) are determined using a database of existing cargo ro-ro ships to obtain the main technical characteristics of the most suitable ship. The time charter, voyage costs and revenue are then calculated considering the technical characteristics of each ship. Fuel costs are corrected for the actual ship speed and loading condition. A number of restrictions in the transportation problem are considered leading to the exclusion of unfeasible solutions. The maximum profit over the period of a year is identified among the feasible pairs of speed and freight rate. This general methodology is applied in a case study that considers the route between Leixões (Portugal) and Rotterdam (Netherlands). The study allows the identification of the most suitable ship and fleet sizes for different market penetration levels and quantifies the impact on shipping company profit of changes in parameters such as fuel costs, time charter costs, emission control area, installed propulsion power and stacking factor. 相似文献