“泰鑫1”采选矿船的选矿系统支撑装置设计

本文对“泰鑫1”采选矿船的选矿系统支撑装置的功能和结构布置、强度校核等方面的设计进行了介绍,并对该装置设计中的关键技术进行阐述和总结,为此类装置在船上的应用提供设计参考。     

长江深水砂被铺设施工工艺

因与先期软体排护底工程有重合区域,针对区域内存在块石及透水框架的问题,为避免对铺设的软体排造成破坏,在现有铺排船铺设软体排的基础上,采用铺排船进行深水砂被铺设处理,达到了阻隔碎石垫层、抛石等挤入淤泥和部分的水平排水的目的。     

S型铺管船固定式托管架设计

以某铺管船设计项目为依托,本文介绍了固定式托管架的基本设计、结构设计和连接锁紧装置设计及计算。该托管架总长约79 m,高约7 m,铰点间距15.5 m,可应用于水深最大为350 m、管径为4 in～60 in（1 in=2.54 cm）的管线铺设,并可在5级海况（风速22.7 m/s,有义波高4.0 m）下待命而不弃管。     

Optimisation and heuristic approaches for assigning inbound containers to outbound carriers

Due to economical and/or geographical constraints, most of the time overseas containers cannot be directly shipped to their destinations. These containers visit transhipment ports where they are first unloaded and temporarily stored and then loaded onto smaller vessels (feeders) to be transported to their final destinations. The assignment of these containers to outbound vessels necessitates several factors to be taken into account simultaneously. In this paper, we develop a mathematical model to reflect multiple objectives with priorities and to assign these containers to different vessels at the transit container port terminal. Although we solve a single-objective (with the weighted sum of objectives) mathematical model to optimality, we also propose two heuristic approaches to solve this complex problem for a transit agency. The first heuristic is shipment based and has four variants differing in how the opportunity costs of the assignments are calculated. The second greedy heuristic is trip based, where the goal is to maximise the capacity utilisation of the vessels. The heuristics return very promising solutions in ignorable computational times. We also provide real-life cases and present our conclusions.     

Container terminal employees’ perceptions of the effects of sustainable supply chain management on sustainability performance

ABSTRACT

Sustainability has become an important issue in container terminal operations. However, relatively little research has been conducted to assess its association with sustainable supply chain management (SSCM). In this study, SSCM consists of internal sustainability practices and external sustainability collaboration. We empirically examined the effects of internal sustainability practices and external sustainability collaboration on sustainability performance in container terminal operations at the Port of Kaohsiung in Taiwan. We developed a model adopting the SSCM construct, which consisted of two dimensions: internal sustainability practices and external sustainability collaboration. Several research hypotheses were formulated from the theory and the hypotheses were tested using survey data collected from 141 employees who worked with container terminals. We found that internal sustainability practices and external sustainability collaboration positively affected sustainability performance, whereas external sustainability collaboration had a positive influence on internal sustainability practices. There is a discussion of the implications of these findings for developing sustainability and improving sustainability performance in container terminals and ports.     

Optimal container ship size: a global cost minimization approach

ABSTRACT

Currently, the best container ship size in a service is determined mainly by the liner operator, considering only the economies of scale of ships. Its external diseconomies to the ports and shippers are usually not considered in the decision-making process, which may reduce the overall efficiency and lead to global nonoptimality. This study incorporates the cost to the shipping companies at the main lines, ports, and feeder services, as well as the external costs to shippers and ports in a hub-and-spoke network, and determines the best ship size and the number of weekly services to minimize the overall costs. The external cost to the shippers in the feeder ports is assumed to be proportional to the feeder cost, and a sensitivity analysis is provided. The maximum container ship size is estimated according to different levels of freight demand. A numerical analysis shows that the optimal size should be smaller than the current biggest container ships in service.     

基于改进三弯矩法在某物探船可调桨推进轴系校中计算的应用

为使轴系校中计算模型更接近实船轴系运转工况,确保采用可调桨推进系统的船舶安全运行,在考虑螺旋桨水动力影响下,采用改进三弯矩法对轴系校中数值计算模型进行改进。并以某物探船为例,对其可调桨推进系统进行动态轴系校中计算。数值计算结果显示：考虑螺旋桨水动力等动态因素影响的动态轴系校中计算确保了采用调距桨推进轴系船舶在各种工况下的安全运转。     

吊装状态下的重吊船运动响应和结构强度分析

针对一艘万t级大开口重吊船在整体吊装时的结构强度问题,采用挪威船级社的SASAM软件对整船有限元模型进行水动力和有限元分析,获得该船在吊装状态下的运动响应和结构强度,为吊装作业和结构设计提供参考和依据。     

基于能力曲线的某风电安装船动力定位系统失效分析

风能是一种优秀的绿色能源,随着风电开发延伸到海上,带有动力定位系统的风电安装船开始得到广泛应用。文章基于动力定位能力曲线对一艘风电安装船的动力定位系统进行失效分析,寻找出最危险的工况,为实际工程提供参考,以便在作业时尽量避开这些工况。     

海底、海面对水下航行体阻力影响的模型试验研究

文章针对水下航行体开展了不同距离的近海底、近海面的模型阻力试验研究,建立了模型试验及分析方法,获得了海底和海面对阻力的影响规律。模型试验表明:采用低速浅浸深试验方法完全可以达到分离近海面、近海底影响的试验目的;仅有自由表面影响存在时,当水下航行体航行在大于其艇长1/3的深度上时,在实际中可认为没有兴波阻力;仅考虑海底壁面影响,当水下航行体航行在距海底超过其1/4倍艇长的距离时就可以不再考虑海底的影响;同时存在自由表面和海底壁面影响时,要完全避免限制水域的干扰需要水下航行体潜深超过1/3倍艇长的同时,水下航行体距海底的距离不宜小于1/2倍的艇长。