两轴全挂车体集装箱包装系统的运输动力学仿真

针对全挂重卡汽车的负载有集装箱体的全挂车体进行多自由度的动力学分析,为后续研究全挂车体对包装集装箱作用减振和降重奠定基础。通过建立全挂车体集装箱包装系统的动力学模型,使用MATLAB进行随机高斯白噪声仿真,并经过滤波处理得到虚拟路面激励。以各轮胎为输入激励,使用软件的微分方程求解模块对两轴全挂车体集装箱系统进行多自由度的动力学微分方程求解。通过模拟仿真,得到在相应时域内取等效步长,得到振幅位移曲线及车体在运行中的振动趋势。结果表明,在模拟仿真的虚拟激励作用下,其垂直位移在5. 5 s时达到最大数值0. 007 8 m;同时通过振幅位移曲线的趋势和虚拟激励趋势相吻合,校核了仿真的效果,为后集装箱包装的全挂车体研究提供新思路。

多体集装箱房屋纵向刚度的理论和有限元研究

首先,基于蒙皮理论分析了目前广泛使用的20ft、40ft集装箱单箱的纵向刚度,并将其应用于多层多跨的集装箱房屋中。然后,利用位移协调和经典力学理论,得出了单层多跨、多层单跨、多层多跨的集装箱房屋纵向刚度公式。最后,采用ABAQUS有限元软件进行了建模分析,有限元模拟与理论分析吻合较好,充分验证了理论分析的正确性。分析结果可为集装箱房屋的设计、施工提供参考。

移动式T11型交换体罐式集装箱的设计

交换体罐式集装箱(Swap-body tank container)源于欧洲,属于内陆集装箱的一种,与ISO标准系列罐式集装箱类似,具备集装箱多式联运所必要的基本特征。本设计的可移动式T11型交换体罐式集装箱是基于ISO系列1标准罐式集装箱的基础,参照EN1432及GB1589标准,以公路、铁路车辆为基点,按照IMDG可移动罐柜导则中适用运输介质品类最广的T11型进行设计,产品主要的性能、参数、尺寸符合相关规范要求,设计文件通过了中国船级社审查批准。介绍了交换体罐式集装箱主要特征和设计规范及标准及移动式T11型交换体罐式集装箱结构形式,阐述了其主要技术参数的选取和罐体计算情况,并以1/2罐体为对象建立了有限元分析模型并进行了计算,相关技术通过了中国船级社的技术审查。

从干散货与集装箱联营的异同看航运业联营发展趋势

2001年正当全球航运界为航运再次步入低潮而焦虑时,两家干散货联营体(Pool)悄然诞生了,它们就是专门经营好望角型船的CapersInternational(CI)联营体和专营灵便型船的International Handybulk Carriers(IHC)联营体.

Modeling of container terminal logistics system based on multi-agent

The similarities and differences between the container terminal logistics system(CTLS)and the Harvard-architecture computer system are compared in terms of organization and architecture.The mapping relation and the modeling framework of the CTLS are presented based on multi-agent,and the successful algorithms in the computer domain are applied to the modeling framework,such as the dynamic priority and multilevel feedback scheduling algorithm.In addition,a model and simulation on a certain quay at Shanghai harbor is built up on the AnyLogic platform to support the decision-making of terminal on service cost.It validates the feasibility and creditability of the above systematic methodology.

Peripheral Challenge in Container Port System:A Case Study of Pearl River Delta

The growth of peripheral ports to dominant hubs has been well documented in North America and Europe,and has led to the elaboration of several theoretical models.However,although changes in containerization growth have been taking place in the South and East Asia in recent years,particularly in China,only a few studies have fo-cused on this region.The Pearl(Zhujiang) River Delta(PRD) has a typical port system with hub and peripheral ports,and provides an excellent case for studying the Peripheral Challenge.This paper introduces the theoretical evidence of the Hayuth model and analyzes the evolution of the container port system in the PRD with five phases:1) phase I:preconditions for change and phase II:initial container port development in the 1970s and early 1980s;2) phase III:diffusion,consolidation,and port concentration in the middle and late 1980s;3) phase IV:the load center in the 1990s;and(4) phase V:the Peripheral Challenge since the late 1990s.The results illustrate that the Shenzhen port presents mounting challenges to the Hong Kong port,descending from a transshipment hub of China to a regional load center of Southeast China.Furthermore,this paper explores five points that have led to the evolution of the port system in the PRD:1) competition in the regional port systems;2) different interested parties;3) shift of investment strategies of in-ternational terminal operators;4) integration of shipping networks and reorganization of carriers;and 5) cost-based competition.

The Investigation of the Effect of Heaving and Pitching on Wave-Induced Vertical Hull Vibration of a Container Ship in Regular Waves

The aim of this paper is to investigate the effect of heaving and pitching of ship motion due to springing bending moment. The investigation was conducted both experimentally and validated theoretically. Series of experiment were carried out using a container model-ship of which length was 3 meter, and the possibility of the so-called nth resonant springing vibration is tested by taking n from n = 2 to n = 4. The bending moment due- to vibration is also measured. The following conclusions were obtained： （l） Occurance of the higher order resonant vibration between 2nd-4th is recognized experimentally; （2） The results indicated that heaving and pitching of ship motion influenced the springing bending moment accurately.