按超长车辆外廓尺寸验算平曲线加宽值

车辆的外廓尺寸是公路几何设计中的重要控制因素。《公路工程技术标准》明确规定了设计车辆的种类及其外廓尺寸,作为确定道路交叉布置和道路几何形状的基本依据。而实际上因某些特殊需要,公路上经常出现外廓尺寸超出设计车辆最大尺寸范围的超长车辆,现行路线规范中平曲线加宽值不能满足其转弯要求。结合水东服务区设计实例,对超长车辆转弯时平曲线半径加宽值验算进行详细论述,具有一定的实际意义。     

自动售检票设备液晶显示屏定时开关控制的开发与应用

根据液晶显示屏的原理和控制方法,编制一个定时控制液晶显示器关闭/开启的控制软件,应用在广州地铁的AFC系统设备上,以此达到延长液晶显示屏的使用寿命,节能降耗的效果.     

非机动车影响下信号交叉口转向通行能力模型的比较

混合交通条件下,非机动车显著影响着信号交叉口转向机动车通行能力．文章剖析了现有的非机动车影响下交叉口通行能力的解析算法,建立了基于VISSIM的通行能力仿真模型,标定了模型参数．通过算例,比较了各种解析和仿真模型．通过仿真实验分析了非机动车对机动车延误、转弯速度的影响．研究表明：各种模型得到的结果差别较大,其中,HCM（2000）与Chen等人（2007）的方法计算的通行能力与仿真实验结果较为一致．假设非机动车在机非冲突区总能够抢先通过,将导致低估机动车通行能力;而只考虑绿灯初期非机动车成群通过造成的影响,将导致高估通行能力．随着冲突非机动车流量的增加,单位数量的非机动车对机动车通行能力、延误和转弯速度的影响逐渐减小．转向车流的仿真通行能力值与平均转弯速度显著线性相关．     

某微型车四轮集中转向机构设计及验证

在一些特定的场合,如汽车在站台、码头等地方作业时,由于空间狭小,需要使用到转弯半径小、转向灵活的微型车。针对此种需求,论文设计出了一种新型的微型车四轮集中转向机构,通过CATIA软件DMU运动机构模块对该转向机构进行了运动学仿真分析。结果表明,设计的转向机构满足微型车的转向要求;将该转向机构应用于实车上进行试验验证,试验表明该机构能很好地完成转向功能。     

某车型减小最小转弯半径优化及验证

在底盘平台化大趋势下,年款车型的底盘基本沿用。但随着人们对整车性能如机动性等提出了更高的要求,此时需要在原平台基础上,在保证改动量最小化基础上进行分析及实车验证,以满足市场要求。文章在影响因素理论分析基础上,结合整车开发范围定义,最终针对某款车型选定增大转向器行程方案,并完成理论分析及实车验证,仅花费数万元的修模代价,即实现对最小转弯半径优化,解决了市场抱怨问题。     

Optimal design of a short‐turning strategy considering seat availability

We develop a methodology to optimize the schedule coordination of a full‐stop service pattern and a short‐turning service pattern on a bus route. To capture the influence of bus crowding and seat availability on passengers' riding experience, we develop a Markov model to describe the seat‐searching process of a passenger and an approach to estimate the transition probabilities of the Markov model. An optimization model that incorporates the Markov model is proposed to design the short‐turning strategy. The proposed model minimizes the total cost, which includes operational cost, passengers' waiting time cost and passengers' in‐vehicle travel time cost. Algorithm is developed to produce optimal values of the decision variables. The proposed methodology is evaluated in a case study. Compared with methodologies that ignore the effect of bus crowding, the proposed methodology could better balance bus load along the route and between two service patterns, provide passengers with better riding experience and reduce the total cost. In addition, it is shown that the optimal design of the short‐turning strategy is sensitive to seat capacity. Copyright © 2016 John Wiley & Sons, Ltd.     

Innovative detector layout for automated traffic turning volume counting

Because of many advantages, loop detectors are the most common practice for obtaining data to control intersections. However, they have some drawbacks, including the fact that multiple detectors are usually required to monitor a location. The current practice in many cities is to install four consecutive loop detectors per lane, or two at the stop bar and one as an advanced detector. In some cities, there are also departure detectors. All these configurations have some practical problems and do not produce accurate counts especially in shared lanes. In this paper, a new placement configuration for departure detectors is proposed and named the mid‐intersection detector (MID). In this configuration, departure detectors are moved back to the middle of the intersection in such a way that they can be activated by more than one movement at different times. In some cases, departure detectors lack equations for calculating turning movements, a problem solved by MIDs because each movement passes more detectors along its path (without increasing the number of loops), and therefore they can produce more accurate and reliable data for obtaining turning movement counts. Copyright © 2017 John Wiley & Sons, Ltd.     

摆式悬架高速磁悬浮列车转向特性研究

为分析某摆式悬架高速磁悬浮列车的转向特性,设计摆式机构和主动电磁导向系统,建立了计算转向特性参数的一般性公式,用数值方法解算了车辆的转向特性参数.给出了悬架的运动形式和受力情况、最小弯道通过判据、主动电磁导向力和阻尼力的大小及分布方式.     

计算机联锁与翻车机联系电路的结合方案

介绍了计算机联锁与翻车机联系电路的技术条件,并结合站场实际对推重及排空作业、联系电路的结合设计及计算机联锁软件处理情况做了认真阐述。     

高速磁悬浮列车转向能力研究

分析了影响列车转向能力的3个主要因素:导向电磁铁长度、摆杆的摆动范围与拉力、相邻转向架对搭接电磁铁的挤压与拉伸,并提出了保持列车摆式结构不变、取消车辆搭接电磁铁、适当减小转向架和导向电磁铁长度的改进方案,使改进后的高速磁悬浮列车能满足较小转弯半径的要求.