地铁车辆不锈钢车体的强度分析

结合国内某地铁车辆不锈钢车体,在分析其结构特点和不锈钢材料的力学性能的基础上,建立了车体结构的有限元模型,并借鉴国内外的地铁车辆技术标准和实际运行状态确定了载荷工况,分析了车体结构在各个工况下产生的应力、变形和模态。结果表明该不锈钢车体的强度满足要求。     

轴对称回转体的CFD分析及厚边界层理论计算

本文采用CFD计算技术和厚边界层理论的积分法,对轴对称回转体周围的绕流场速度分布、表面压力、摩擦阻力系数以及边界层厚度分布进行了数值分析计算。本文提供了两种方法的计算结果,并与有关文献给出的试验结果进行了比较和验证。对比表明,计算结果和试验结果的趋势基本一致,在一定程度上验证CFD方法和厚边界层积分法的有效性和可靠性。     

汽车车身计算机辅助设计系统的集成环境

本文分析了计算机辅助车身设计的特点，指出必须集成的观战构建车身ＣＡＤ系统，并给出了一车身身ＣＡＤ系统集成环境的组织结构。     

汽车车身面漆颜色的选择

主要介绍了车身面漆颜色与工业美学、安全性、生产管理、材料成本等因素之间的联系,为选择车身面漆颜色提供参考。     

Using longitudinal methods for analysis of a short-term transportation demonstration project

This paper documents an application of panel, or longitudinal data collection in the evaluation of a TSM (Transportation Systems Management) demonstration project. The project was a four-week demonstration of staggered work hours in downtown Honolulu during February–March 1988. The 4 wave panel survey elicited commuting experiences of approximately 2,000 downtown employees at two week intervals before and during the project. The sample involved both employees who participated in the project by shifting their work hours, and those who did not. The panel survey was augmented by floating-car observations of travel times on major routes into downtown Honolulu on the same four dates.The purpose of the analysis was to determine whether employee commute times were affected, and if so, how these changes were distributed among various employee segments. Two methods were used. First, travel time changes were estimated using paired t-tests. Second, regression equations were used to estimate project time savings as a function of trip length, route, and location of residence. Results show that travel time savings due to the project were typically small, less than ten percent. Nonparticipants experienced greater savings than participants, and some segments of participants experienced longer travel times during the project. The panel method proved to be an effective way to measure project travel time impacts and shows that the method is appropriate in short time applications.Presented at the Annual Meeting of Transportation Research Board, January 7–11. 1990, Washington, D.C.     

探讨客车不锈钢车身制造工艺

随着海外出口客车量的增加,海外车辆对于客车车身防腐的要求也越来越高。不锈钢材料在客车车身上应用技术日益成熟,为满足海外客车的防腐要求,不锈钢做为客车车身材料的应用也越来越广泛。本文主要阐述客车不锈钢材质选择、车身设计结构、车身制造工艺难点和控制。     

有机废弃物填埋场自然坝体消险加固方案研究

某有机废弃物填埋场封场之前存在岩溶和滑坡、崩塌等地质灾害,通过对场地条件和地质条件进行分析,对边坡稳定性进行计算,提出边坡加固方案,对于不稳定、欠稳定的楔形体区域采用框架梁+锚杆的支护,对于边坡整体稳定性较好的区域采用喷锚支护,确保填埋场封场后坡体自身安全并提高其抗渗能力.     

100%低地板现代有轨电车轻量化研究

100%低地板现代有轨电车具有节能、环保、投资小、载客量适中、乘坐舒适性高、后期维护费用低等特点,同时面临着严峻的轻量化及减重要求。对车体结构轻量化以及车体部件和内饰部件轻量化材料的应用开展研究,介绍了相关设计结构及应用方案。     

时速350 km双层动车组相关技术参数对车体模态的影响

以某时速350 km、16辆编组的双层动车组为研究对象,考虑车辆平衡对车辆布局进行优化,并对动车组除车体外的其他部件进行轻量化设计。建立车体有限元计算模型,采用控制变量法分析车体相关部位参数变化对车体模态的影响,优化车体结构,确定车辆整备状态下的模态频率。结果表明,通过合理的列车布局方案及编组形式,相比于16辆长编组单层动车组,双层动车组的定员可提高31.8%;通过对动车组其他部件质量进行有效控制,质量降低2.4 t;车辆整备状态下菱形模态振动频率可达10.318 Hz。     

海上半浮体漂移轨迹研究

通过水上半浮体漂移过程的模拟研究,总结出一种循其轨迹,寻其“源头”的模拟计算方法。首先分析外海流系,沿岸流系,风海流、潮流,并以数学方程式描述之,然后作半浮体漂移的推算,最后以实例验证。本研究可给海事查证工作作参考。