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在风力发电设备安装船的典型装载工况下,应用三维势流理论进行波浪诱导载荷长期预报,以主要载荷控制参数为依据进行设计波的选取,应用DNV的SESTRA模块将设计波载荷施加于船体进行船体结构直接计算分析。计算结果表明:船体结构设计均满足要求。 相似文献
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某甲板驳船的主尺度比超出规范要求,为此,在频域内采用三维线性势流理论的波浪载荷计算方法,选取修正P-M双参数波浪谱及相应海域的波浪散布图,分析不同装载工况下船体所受波浪载荷并进行总纵强度分析. 相似文献
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船体分段焊接变形仿真 总被引:1,自引:0,他引:1
船体分段在焊接过程中产生的焊接变形会使船体结构强度降低,然而精确预测和控制焊接变形是个难题.文章提供了准确预测焊接变形的固有应变等效载荷法.这种方法运用有限元法结合固有应变理论以及实验结果对焊接变形进行分析:引入简化的弹-塑性分析杆-弹簧模型,通过分析得到固有应变受焊接区域约束度及最高温度分布情况的影响;将固有应变转化为等效载荷,应用弹性有限元分析求得整个结构的焊接变形.计算结果与LEECH计算及实验结果吻合较好. 相似文献
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预测船体分段焊接变形方法概述 总被引:5,自引:1,他引:4
船体分段在焊接过程中产生的焊接变形会使船体结构强度降低,精确预测和控制焊接变形是现代造船工艺的要求.焊接变形分析方法包括实验法、解析法、数值分析法、等效载荷法等,常用的是后两种方法.数值分析法采用热弹-塑性有限元模型精确模拟焊接现象,但计算工作量大;等效载荷法计算焊接区域的固有应变,并将其转化为等效载荷,进而应用弹性有限元分析求得整个结构的焊接变形. 相似文献
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Containership stowage plans are a pivotal teaches in the system of container transportation. With the increasing containers shipping, planning containership stowage has become more and more complicated. So intelligent stowage planning for containerships is of great significance. An effective stowage plan may improve efficiency of transportation system. First, the progress of containership stowage plan at home and abroad is reviewed, including the latest developments, such as the application of various optimization methods and computer techniques to the problem. Then, the complexities of the problem are discussed and areas where investigations are still needed are pointed out. This will provide a reference for further research on the subject. 相似文献
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货运重载是适应国家经济社会发展和提高铁路自身企业效益的需要,是我国铁路的发展方向;从理论上计算了重载铁路到发线的有效长,详细分析了影响到发线的各种参数,提出适应系列重载列车的到发线有效长。 相似文献
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33m汽车渡船运载大型容器时甲板上的载荷情况复杂,如果能简化为合理的力学模型,并根据力学叠加原理,直接应用结构力学中的一些基本公式来进行计算,这比采用三弯矩和五弯矩方程要简便明了,并能得到满足工程要求的效果。 相似文献
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Calwin S. Parthibaraj PL.K. Palaniappan Angappa Gunasekaran 《Maritime Policy and Management》2017,44(6):705-726
The support of containerization to trade development demands an efficient solution method for the container loading problem in order to reduce shipment and handling time. Hence, the stowage planning of containers is critical to provide speedy delivery of resources from the area of supply to the area of demand. Moreover, information on container terminal activities, structure of ship, and characteristics of containers is distributed among stowage planners. This information imposes constraints, and so the master bay plan problem (MBPP) becomes NP-hard. Therefore, a multi-agent systems (MAS) methodology is designed to effectively communicate the information and solve the MBPP sustainably. In the designed MAS methodology, an information exchange system (IES) is created for stowage planners to bid for ship slots in each experimental iterative combinatorial auction (ICA) market. The winner in the ICA experiments is provided with the ship slots, and the entire bay plan is prepared. Further, the ship-turnaround time is validated using the data obtained from the benchmark problem. 相似文献
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集装箱船舶实配过程的遗传算法解决策略 总被引:4,自引:0,他引:4
本文基于模糊优选的多目标优化遗传算法和隔离小生境技术的多峰函数优化遗传算法,建立了集箱船舶实配模型。计算机模拟的结构表明,计算结果符合工程要求,具有推广应用价值。 相似文献