CW-2系列转向架轴箱定位节点垂向刚度研究

介绍了CW—2系列转向架运用中出现的故障,结合轴箱定位结构分析了定位节点刚度较大带来的问题,并得出定位节点垂向刚度较大也是导致转向架出现较多运营可靠性问题的初步结论。利用动力学分析软件,计算了不同节点定位刚度对轮轨垂向力、构架垂向振动、节点处动态垂向力和车辆其他动力学性能的影响趋势,以TGV高速列车的2种转向架的试验比较进行了验证。     

自动控制跟踪激光导向系统在地铁中的应用

主要介绍了自动控制跟踪激光导向系统的性能、原理以及在地铁施工中的应用     

Japanese perspective of driver information systems

A perspective view of of Japanese R&D activities of Driver Information Systems is given from the standpoint of developing joint projects by public and private sectors. First, a brief history of the R&D activities is illustrated from above mentioned standpoint. Then, two major projects, AMTICS and RACS, and the social backgrounds of these projects are explained. In order to give a clear idea of both projects some technical details are treated.Based on the history and the present status of the developments, the basic design conceptions of Japanese Driver Information Systems are explained and several factors or reasons which have influenced to the design conception are discussed. Then, the promoting systems of the R&D activities are generally explained and present status of the projects and future problems in developing more advanced systems are also handled. A brief discussion on the establishment of international standard is also mentioned as a final comment.     

锰毒作用表现的研究

调查研究表明，慢性锰中毒早期主要表现为类神经征，继而出现锥体外系神经受损症状，肌张力增高，手指明显震颤，腱反射亢进，并有神经情绪改变。严重患者锥体外系神经障碍恒定而突出，表现为帕金森样症状。锰中毒患者的肌电图、脑电图、气脑造影、脑血流图、脑CT和MRI均有不同程度的改变，为临床诊断提供了较多的参考依据，同时也为现行的锰中毒诊断标准提供了新的内容。     

Leave the expressway or not？ Impact of dynamic information

This study investigates drivers＇ diversion decision behavior under expressway variable message signs that provide travel time of both an expressway route and a local street route. Both a conventional cross-sectional logit model and a mixed logit model are developed to model drivers＇ response to travel time information. It is based on the data collected from a stated preference survey in Shanghai, China. The mixed logit model captures the heterogeneity in the value of ＂travel time＂ and ＂number of traffic lights＂ and accounts for correlations among repeated choices of the same respondent. Results show that travel time saving and driving experience serve as positive factors, while the number of traffic lights on the arterial road, expressway use frequency, being a middle-aged driver, and being a driver of an employer-provided car serve as negative factors in diversion. The mixed logit model obviously outperforms the cross-sectional model in dealing with repeated choices and capturing heterogeneity regarding the goodness-of-fit criterion. The significance of standard deviations of random coefficients for travel time and number of traffic lights evidences the existence of hetero- geneity in the driver population. The findings of this study have implications for future efforts in driver behaviormodeling and advanced traveler information system assessment.     

间接通达指路标志研究

论述了部分国家和地区指路标志间接指引的规定,及我国指路标志间接指引存在的问题。从美国、日本、英国、瑞典、韩国和我国台湾省在间接指引标志设置的规定和实例来看,间接指引多采用符号化方式对道路编号进行指示,也可用图形化方式表示。我国一般在匝道出口或交叉口标志上列出路线编号或路名来表示间接指引,很难区分直接指引和间接指引,易引起误解。在国内外比较研究的基础上,提出我国间接指引标志设计原则:间接指引以指示路线为主;标志内容应简单易懂;重要道路间接指引应多次指示。提出了5套间接指引标志设计方案,并给出了间接指引标志的设置位置和使用范围,供科研、设计、标准制订者参考。     

磁导航车体运动数字控制系统数学模型研究

探讨磁导航车体运动数字控制系统的数学模型。用实验方法建立磁导航车体运动数字控制系统典型环节的时间连续数学模型,结合车体运动机械操纵环节的传统数学模型建立整个控制系统的时间连续数学模型。利用Z变换方法把控制系统时间连续数学模型转换成离散数学模型,引入数字控制系统典型环节的数学模型,建立磁导航车体运动数字控制系统的离散数学模型。设计数字控制系统的二次型最优控制器并进行计算机仿真。仿真分析结果验证了数学模型的有效性。     

高速公路场景图像的二值化及交通标志定位检测方法

采用CCD摄像机采集高速公路场景图像，并通过图像颜色空间变换，将图像的RGB量值转换为色度-饱和度-亮度（HSV）量值。采用基于阈值的方法对场景图像中颜色饱和度分量进行二值化分割处理；利用场景二值化图像形状特征（周长、形状参数、圆形性参数）去除非目标区域，并通过搜索场景二值化图像方向投影值序列的突变点实现标志准确定位。采用HSV颜色模型中的亮度分量和最佳阈值法对场景图像中标志区域进行二值化处理。结果表明，应用上述方法能取得良好的效果。     

模糊逻辑推理在消除交通流诱导负效应中的应用

针对交通流诱导可能产生的负效应问题,提出了诱导负效应消除的原理和模糊逻辑推理方法。在原理设计中,考虑了出行者的出行行为对网络交通流分配的影响;在实现方法上,应用模糊推理技术对分流交通量进行了预测,并设计了路线交叉口信号灯配时方案调整的模糊控制算法,模拟结果验证了模糊逻辑推理技术的有效性。研究表明:交通流诱导负效应的产生主要是由于信息条件下的道路出行者路线选择行为的不确定性引起的,而且交通流诱导与控制同时进行是消除交通流诱导负效应产生的关键。     

关于高速公路交通安全设施的设置

交通安全设施对减轻事故的严重度,排除各种纵、横向干扰,提高道路服务水平,提供视线诱导,增强道路景观等起着重要的作用,属于道路的基础设施.