SPSM and its application in cylindrical shells

In naval architectures, the structure of prismatic shell is used widely. But there is no suitable method to analyze this kind of structure. Stiffened prismatic shell method (SPSM) presented in this paper, is one of the harmonic semi-analytic methods. Theoretically, strong stiffened structure can be analyzed economically and accurately. SPSM is based on the analytical solution of the governing differential equations for orthotropic cylindrical shells. In these differential equations, the torsional stiffness, bending stiffness and the exact position of each stiffener are taken into account with the Heaviside singular function. An algorithm is introduced, in which the actions of stiffeners on shells are replaced by external loads at each stiffener position. Stiffened shells can be computed as non-stiffened shells. Eventually, the displacement solution of the equations is acquired by the introduction of Green function. The stresses in a corrugated transverse bulkhead without pier base of an oil tanker are computed by using SPSM.     

A comparison of Chinese,Japanese, and Korean shipyard production technology

This paper compares Chinese, Korean, and Japanese shipyard production technology. Development in the world shipbuilding over recent years has influenced focus areas related to shipyard manufacturing technologies and product performance. Software systems, information technology, production technology, and local challenges of shipyards are compared with shipbuilding outputs among these three countries. Various technologies developments, shipyard production and the problems in Chinese, Japanese, and Korean shipyards are discussed respectively. Finally, future areas of research are pointed out.     

09-3X型捣固装置结构原理分析

通过对09-3X型捣固装置的结构原理分析计算,并与09-32型对比,阐述09-3X型捣固装置满足3枕连续式捣固稳定车的作业需要,且结构合理,使用维护方便。     

地铁供冷车站冷冻水大温差系统节能分析

结合某地铁车站工程,对冷冻水系统采用标准温差(7℃/14℃)与大温差(7℃/14℃)两种工况下冷水机组、冷冻水泵、空调末端的初投资及运行费用进行分析,得出采用大温差技术节能效益明显、适用于地铁单独供冷车站的结论。     

电动化领域相关专利情报分析

本文通过专利数据库和专利分析软件对我国电动化领域专利进行检索并实现IPC分类分析,得到数据图表。通过分析发现H02J小类,G06K小类,G05D四个小类中专利专利数量基数较小,且其中有很多大组类在本领域申请数量极低,可重点考虑。     

Design of Wind Turbine Blade for Solar Chimney Power Plant

Aiming at the global efficiency of solar chimney power plant (SCPP), we design a wind turbine generation device to elevate its electricity generating efficiency. Based on wind power utilization theory, a new method is proposed to design a type of wind turbine blade for SCPP. The lift and resistance coefficients on different Reynolds numbers of NACA4418 airfoil, which is suitable for experimental solar electricity generation system, are determined by Profili-V2.0 airfoil design software, a program written in Matlab to calculate chord length of the airfoil. The optimization is conducted by class-shape-transformation (CST) parameterization method and Xfoil software. An airfoil design program is designed on the basis of blade element theory and attack angle with the highest lift coefficient to iteratively determine the inflow angle and setting angle. Prandtl’s tip-loss factor is applied to correct the setting angle, after the airfoil data are input into AutoCAD to build an airfoil model which is then imported into Solidworks to draw blades. A new way is put forward to design wind turbine blades in SCPP.     

筑路机械液压系统的污染与控制

通过对筑路机械液压系统的污染分析，较全面地阐述了液压油污染物的种类及其对系统的危害，描述了系统污染的基本评定方法，提出了污染控制应采取的基本措施和注意的问题。     

“深冷”集装箱的开发

美国集装箱服务公司(Container ServicesCo.以下简称CSC公司)和GoReefers国际物流公司达成协议,双方合作共同开发深冷集装箱市场,由CSC负责制造,并使用于欧洲、南美、美国、新西兰、中国和非洲之间的冷冻货航线。新航线将采用CSC公司的“低温动力”(cryo-power)冷藏箱,其主要技术特征是有一套以可循环CO2为致冷剂的低温制冷系统。CSC公司宣称,低温动力为非机械制冷模式,不需额外消耗能源,不增加维护和监控费用。这也就意味着可适用于与标准干货箱相同的任何运输方式,从而降低了运输成本。     

中长期铁路网规划技术评价指标体系的研究

铁路网规划的技术评价是铁路路网健康发展和科学管理的需要。针对当前我国铁路路网规划的现状,从定性和定量两个方面建立了铁路网络布局规划方案的技术评价指标体系,为中长期铁路网的规划和发展提供了依据。     

承重跨越式支架在路中高架车站施工中的应用

结合承重跨越式支架在重庆轨道交通路中高架车站施工中的应用实践,介绍了承重跨越式支架的结构形式、结构验算、施工方法以及施工主要安全措施等,可为类似工程施工提供参考。