弹塑性固有应变法在厚壁球面舱壁结构焊接中的应用

针对热弹塑性有限元法仅适用小规模焊接的弊端,采用弹塑性固有应变法对厚壁球面舱壁结构的焊接工艺进行模拟,并对球面舱壁结构的焊接工艺进行优化,最终给出球面舱壁结构合理的焊接工艺.在大型有限元软件ANSYS的基础上,通过开发的热弹塑性焊接计算程序得到单道焊缝焊接时的残余应变;通过残余应变等效,对球面舱壁的各焊缝处施加温度载荷;通过一次弹塑性有限元法得到厚壁球面舱壁结构的整体变形.通过开展不同焊接工艺下球面舱壁结构的焊接变形分析,给出厚壁球面舱壁结构合理的焊接工艺.     

基于Web的机舱远程监控系统设计

使用基于Web的监控技术实现机舱设备的远程监控与管理是当前船舶自动化发展的趋势。本文把基于Web的网络技术应用到船舶机舱设备远程监控和故障诊断领域,提出了利用LabVIEW的Web发布工具实现远程监控的系统方案,给出了该系统的基本结构、功能、硬件组成和利用LabVIEW实现Web发布的具体方法。远程用户通过Web浏览器可对现场监控机发出监控指令,获取机舱设备的状态参数。当出现异常数据本船无法判别时,可通过远程故障诊断系统进行在线诊断。     

Development of port service network in OBOR via capacity sharing: an idea from Zhejiang province in China

The ‘Silk Road Economic Belt and the 21st-Century Maritime Silk Road’ (One Belt One Road, OBOR) strategy initiated by the Chinese government has a significant impact on the business and logistics modes which involves Asia, Europe, Africa, and their adjacent seas. Many countries and ports are developing new strategies that are suitable for this economic environment. Compared with many ports in the world, the ports in Zhejiang province of China have a novel property. In addition to Ningbo-Zhoushan port, there are several other sea ports and river ports in that province. In this paper, we propose a concept of port service network that consists of a huge hub and multiple ports. Ports of small and medium sizes can share their capacities of different types of port service with the hub when the service capacities are integrated into the network. We develop a mixed integer nonlinear programming model to determine the optimal decisions in such a network with constraints on the budget to conduct integration. An optimization algorithm incorporated with a genetic algorithm is developed to solve large size problems. We provide managerial insights on the policies of government, including expanding port capacity, reducing fixed integration cost, and providing better financial condition.     

便携式多参数水质监测系统的设计

本文针对海洋环境中的温度、酸碱度、盐度及溶解氧多个参数对象,以STM32F 103 ARM为核心控制器设计了多参数水质监测系统,可以实时的检测四个参数的数值,并通过蓝牙无线传输将数值显示在上位机的L C D上。实验结果证实该设计可以对海洋环境的多参数进行准确、实时、便携的监测。     

Evaluation of transit proximity effects on residential land prices: an empirical study in Austin,Texas

The Austin MetroRail line in Texas, U.S.A. began operations in 2010 and since then transit-oriented development projects have been fuelled around train stations. Traditional location theory holds that proximity to a transit station should be capitalized into land prices, and numerous empirical studies have demonstrated the effects with mixed results. However, to date no empirical study has investigated this relationship between the newly built rail line and land prices in Austin. This study fills the research gap and suggests a positive effect associated with transit proximity by employing spatial hedonic models. This study also contributes to the existing literature especially in the context of Texas cities where there is a lack of relevant research on transit-capitalization-related topics, and provides insights for decision-makers with different perspectives regarding further rail investment or transportation financing strategies such as value capture programs.     

海流对潜布水雷水中弹道的影响研究

针对某型水雷的水中弹道问题,分析了某型潜布沉底水雷的水下无动力运动过程中的受力情况,在分析海流对其作用力的基础上,建立了研究其水下散布的水下无动力运动的六自由度空间弹道数学模型和海流影响分析模型,并用Matlab软件编写了潜射水雷水下散布仿真程序,并对不同流速条件下的水雷散布进行了研究,给出了仿真结果和分析结论。     

水下潜器改进S面控制及控制系统仿真(英文)

S surface controllers have been proven to provide effective motion control for an autonomous underwater vehicle (AUV). However, it is difficult to adjust their control parameters manually. Choosing the optimum parameters for the controller of a particular AUV is a significant challenge. To automate the process, a modified particle swarm optimization (MPSO) algorithm was proposed. It was based on immune theory, and used a nonlinear regression strategy for inertia weight to optimize AUV control parameters. A semi-physical simulation system for the AUV was developed as a platform to verify the proposed control method, and its structure was considered. The simulation results indicated that the semi-physical simulation platform was helpful, the optimization algorithm has good local and global searching abilities, and the method can be reliably used for an AUV.     

越人——我国古代天生的航海家

<正>公元2500年前的一天,中国大陆东南沿海一隅,一支由楼船、戈船、扁舟、轻舟等混编而成的船队正待启航,或者是一次征服,或者是一次移民,或者仅仅是一次巡游。风和日丽,波澜不兴,但船员们知道看似平静的水域蕴藏着怎样的凶险,不过从他们脸上看不到畏惧,更不会退缩,无数次惊涛骇浪中的体验早已化为一种从容。     

浅谈保修厂厂长工作要点

公交企业的保修厂作为一个独立的工作系统,承担着运营车辆的维修、保养任务,工作头绪多且涉及面宽.保修厂厂长如何做好管理工作,本人结合自己的认识和经验总结工作要点如下,供参考.