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.     

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。     

车载信号系统软件开发用半实物仿真平台

基于无线通信的列车控制(CBTC)系统与传统的基于轨道电路的信号系统在原理上不相同,其车载计算机的在线动态调试不能仅依赖于地面轨旁设备安装完毕后再在线路上进行硬件调试和软件修改.建立一套可模拟车辆运行条件的半实物仿真平台,在实验室环境下先期对车载计算机进行硬件调试以及软件的设计、验证和测试是非常必要的.介绍了CBTC系...     

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。     

铁路枢纽车站信号集控设计方案研究

根据目前国内铁路枢纽车站站场布置及作业办理现状,为减少行车办理中间环节,简化流程,提高效率,通过研究枢纽车站信号集中控制设计方案及相关技术,对比分析了3种联锁和控显方案,探求枢纽内车站(场)行车作业办理安全、可靠、高效的解决方案,为涉及枢纽车站信号集中控制有关的工程设计提供技术支持。     

悬索桥主塔顶横梁牛腿支架设计与施工

主塔顶横梁一般距桥面较高,普通支架体系很难满足工程需要.为此,研究了牛腿支架体系（包括三角牛腿、分配梁、贝雷梁、碗扣式脚手架和方木等）在主塔顶横梁施工的应用.从数值分析、现场施工及监测数据来看,该支架体系受力明确、合理,能够克服普通支架体系的不足,且便于施工,可为类似工程提供参考.     

拉格朗日法对溜管输送混凝土流变数学模型探讨

考虑溜管中混凝土重力与管壁的摩擦力，运用拉格朗日法建立了在重力作用下混凝土在软管溜筒中流变的数学模型，运用牛顿迭代求解，并将计算结果与输送情况作了比较。