基于计算机视觉的交通事故现场测量系统

本文描述了基于计算机视觉进行道路交通事故现场测量系统的构成及系统基本工作过程。     

活塞环径向压力分布的精确测量方法

为深入研究活塞环径向压力分布的规律，本文分析了活塞环径向压力分布传统测量法的缺点，研究了活塞环变形与径向压力的关系，提出了一种电测量方法，能够精确测量活塞环径向压力分布。实际测量结果表明，采用新方法测量活塞环径向压力分面，结果稳定可靠，重现率高，并且有较高的精度。     

人体胸部侧向碰撞模型参数值确定方法

本文以人尸体胸部无反弹冲撞式滑车侧向碰撞试验为基础，建立与试验相适应的人体胸部侧向碰撞模型。通过导出试验与模型之间误差的函数关系和应用最小误差理论。探讨了如何根据测试胸部生物力学特性的试验数据确定定最佳参数的方法问题。     

轮胎非稳态转向特性非线性仿真模型

本文以轮与路面之间的滑移速度为出发点，在稳态指数统一模型的基础上，建立了轮胎非稳态转向特性非线性仿真模型。在实验研究中，发现了动态过程回正力臂和附加的回正力矩的滞后特性。仿真和试验结果对比表明，该模型足以反映轮胎非线性转向特性，可用于前轮及汽车操纵动力学仿真方面的研究。     

Ride Quality and Dynamics of Rail Vehicle Models for Microcomputers

This paper describes mathematical and computer models for ride quality and dynamics of rail vehicles developed for running on personal computers. The purpose of the computer simulations is for prediction of ride quality in order to study the dynamic stability of the system and the effect of track quality and irregularities on ride quality.

In deriving the equations of motion for dynamic stability, the tangential forces acting on the contact areas between the wheels and rails are of fundamental importance in railway vehicles dynamics and are included in the analysis [1]. These forces are due to the creep phenomenon between the wheel and the rail on which it is rolling. Track irregularities are defined in terms of four components consisting of gauge, cross level, alignment and vertical surface profile [2]. Relation of allowable track irregularities versus speed is given by the FRA Track Safety Standards. Analytical representation of track irregularities should include both PSD (Power Spectral Density) for CWR (Continuous Welded Rail) as well as discrete inputs from track joints.

In this paper, the rail vehicle suspension analysis and dynamics mathematical and computer models are described. The computer models are written in Fortran 77 and designed to run on personal computer. The paper also discusses programming considerations that must be taken into account when programming for microcomputers under DOS (IBM's Disk Operating System) and MS or RM Fortran Compilers. Most of the considerations are however, valid in general with respect to engineering software development and programming for microcomputers.

Computer graphics is a powerful tool for visualization of the resulting solutions such as the display of the characteristic roots for the eigenvalues solution on a root locus plot and representation of acceleration levels versus the “Reduced Comfort Boundary” limits defined by the International Standards Organization” (ISO 2631-1985). In this paper some examples of these resulting outputs are presented and their significance discussed.     

广州城市轨道交通变电所综合自动化和电力监控

介绍了广州城市轨道交通变电所综合自动化系统的网络结构与主要设备配置,以及将变电所综合自动化系统集成于综合监控系统以实现电力监控的设计方案.对综合监控系统中电力调度子系统提出了具体设计要求和技术指标,并对电力调度子系统信息流程及信息传输网络的安全策略进行了介绍.     

激光参数对高强度不锈钢搭接焊接结构和断裂行为的影响

通过焊接和拉伸试验及微观组织分析,研究了焊接参数对高强度301L-HT板搭接非熔透激光焊接接头结构、断裂行为和力学性能的影响.结果表明：激光焊缝的硬度为HV215,δ铁素体比电阻点焊少,热影响区硬度更接近于母材;焊缝几何结构对激光参数敏感,熔深变化的规律性更明显,特定部位的熔宽与焊接参数耦合有关;板材厚度相同的焊接接头变形刚度接近,焊缝的几何结构决定最后的变形和断裂行为,焊接内板的弯曲变形角度比外板大,两板的弯曲角度差随熔深增加而减小;焊接板弯曲角度和焊接强度随焊缝尺寸同步升高;焊缝硬度低于母材和热影响区导致拉伸变形集中在很窄的区域,焊接接头的断裂位移都小于2mm.     

列车运行控制系统车载设备发展探讨

综述了国外列车运行控制系统的主要技术特点,介绍了国内列车运行控制系统的发展过程,简要分析了我国车载设备存在的不足之处。对列车运行控制系统车载设备的系统设计、安全性及发展方向等问题进行了探讨。     

电气化铁道接触网导线高度的动态检测

介绍了安装在运营电力机车上的电气化铁道接触网导线高度动态检测装置的组成、工作原理、安装及机械设计,并进行了精度分析,给出了现场使用情况和检测结果。该装置充分利用了激光相位测距技术,在不影响机车正常运作的情况下,实现了导线高度的动态检测,较好地克服了人工检测及检测车检测的局限。     

机车车体蒙皮结构动态特性分析

建立某机车车体有无蒙皮结构的2种有限元实体模型;分析了蒙皮结构在车体结构有限元分析中的具体影响;提出了车体蒙皮结构在动态特性计算中的处理方法。指出要提高机车车体结构的有限元分析精度,就必须考虑蒙皮对结构动态性能的影响。