The design of bus route systems — An interactive location-allocation approach

An interactive modelling approach is developed to solve the practical problem of bus route network design. Possible bus routes are identified with facilities which can be located. Zones or pairs of zones in the urban area are identified with customers who will be allocated to the established facilities. It is shown that the classical Set Covering Problem is useful under the assumption of fixed demand; the Simple Plant Location Problem is effective under the assumption of demand which is sensitive to the level of bus service provided.     

城市轨道交通车地无线的网络架构及应用

基于目前城市轨道交通运营及安保对车地无线通信网络的需求,通过对WLAN(无线局域网络)及TD-LTE(时分长期演进)技术方案的对比分析,提出更为适用于城市轨道交通的TD-LTE车地无线技术方案.结合郑州市轨道交通1号线一期工程的实例,验证该方案能够实现高速移动状态下的大带宽传输、多业务承载,可解决轨道交通车地通信的瓶颈问题,满足承载需要.     

人类仿真技术在铁路系统中的应用

摘要：对应用于铁路人机工程学的人类仿真方法进行了总结,即一种仿真器是采用虚拟现实技术来模拟环境,例如驾驶仿真器、乘坐舒适度仿真器、铁路车站仿真器等。另一类仿真器则采用计算机仿真技术来评价列车司机工作时承受的精神负担、列车碰撞引起的旅客运动方式及损伤等。     

25Hz相敏轨道电路自动调压系统研究

根据铁路现场对轨道电路检修要求和《铁路信号维修规则技术标准I》中对25Hz相敏轨道电路轨道电压的规定,总结出铁路现场对自动调压系统的需求,并结合目前单片机和传感器技术的发展,对25Hz相敏轨道电路自动调压系统进行了研究。     

地铁商业物业租赁定价实证研究

结合地铁商业物业租赁的行业背景,对影响地铁沿线商铺定价的客观因素进行分析,并以武汉市的样本为例进行实证分析,建立地铁沿线商铺定价的特征价格模型。在此价格模型基础上,根据地铁商业物业自身特点进行整租模式、终端商铺模式等因素修正,最终构建地铁公司的商业物业租赁定价模型。该模型通过结合特征价格模型和修正因子,在一定程度上克服了传统市场化定价方法的主观性,有利于完善传统商业地产的租赁定价模式,为地铁物业的商业租赁定价提供参考。     

Research on the Influence of Vertical Deformation of Bridge on the Track RegularityEI北大核心

Research purposes: The vertical deformation of high-speed railway (HSR) bridge will cause the track irregularity, which threatens the safe and efficient operation of the HSR. Taking the 32 m simple supported beam bridge as the research object, based on the existing mapping analytical model for bridge vertical deformation and rail geometry, the influence of the track regularity of the CRTS Ⅰ slab ballastless track structure caused by the key parameters such as the bridge vertical deformation amplitude, the hanging length of the beam end and the vertical stiffness of mortar layer were studied, and the corresponding measures to control the rail deformation were proposed, to provide theoretical reference for comprehensive treatment of rail deformation of HSR bridge. Research conclusions:(1) The pier settlement, the vertical rotation of the beam end and the beam fault will cause the rail to follow the beam deformation, and "up-warping" of the rail on the vertical deformation boundary will appear. (2) The rail deformation is directly proportional to the vertical deformation amplitude of the bridge and the key to control the rail deformation is to reduce the vertical deformation of the bridge. (3) The rail deformation can be controlled by reducing the hanging length of beam and vertical stiffness of mortar layer. (4) The research results can provide a theoretical reference for controlling the vertical rail deformation of high-speed railway bridges. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

The Reinforcement Analysis of Prestressed Anchor Frame Beam in the Deep Cutting Slope under Three Dimensional Strong EarthquakeEI北大核心

Research purposes: In order to further study the reinforcement of prestressed anchor frame beam in the deep cutting slope under three dimensional strong earthquake, a model of the deep cutting slope is built through FLAC 3D simulation software, the seismic wave to the model from three directions of x,y and z is input, and the dynamic response of the slope is analyzed. Then, the prestressed anchor frame beam reinforcement measures are applied to the model, and this paper analyzes the reinforcement effect of the prestressed anchor frame beam to the deep cutting slope under three dimensional strong earthquake. Research conclusions:(1) The prestressed anchor frame beam has a good effect on restraining the horizontal displacement of the deep cutting slope. (2) Under the three dimensional strong earthquake, the prestressed anchor frame beam has a good effect on the horizontal acceleration and horizontal velocity of the deep cutting slope, which reduces the peak of horizontal acceleration and horizontal velocity. (3) Through the comparison of the response before and after the reinforcement of the prestressed anchor frame beam is given under the 9 degrees three dimensional strong earthquake, it can be concluded that the prestressed anchor frame beam can provide good reinforcement effect to the deep cutting slope. (4) This research can be used for reference to the earthquake resistance of the slope engineering. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

轨道交通车辆模态参数辨识方法研究

运用子空间辨识数值算法直接辨识出轨道交通车辆动力学系统的状态方程,对系统矩阵进行特征值分解后获得模态频率和阻尼比,运用稳态图来确定系统的物理极点,最后获得所识别系统的模态参数。利用此法,对轨道交通车辆垂向仿真模型进行了模态参数辨识研究。研究结果表明:如以轨道不平顺作为车辆输入、以车体和构架的位移响应作为系统输出进行辨识,则即使在噪声信号较大时,仍能获得良好的识别效果;运用仿真模型的加速度输出信号进行辨识时,车辆模态参数的识别精度受噪声影响很大;当噪声信号为原信号的5%时,以构架加速度作为输入、车体振动响应作为输出,仍能有效地识别车体的模态参数。     

曲线对高速货车转向架焊接部件疲劳损伤的影响

依据UIC510—3:1994规定的疲劳试验加载方法,基于有限元法研究了不同左右曲线变换次数取值时高速货车转向架焊接构架及摇枕疲劳关注部位累积损伤的变化程度及规律。仿真结果及综合分析表明,当左右曲线变换次数取值变化并不十分显著时,其对结构疲劳损伤影响很小,样机疲劳试验中可直接应用UIC规范中的建议值。     

JC型弹性旁承体安装时侧翼橡胶层应力分析

对目前货车转向架装用的JC型双作用弹性旁承体进行了非线性有限元计算,分析了旁承体两侧翼橡胶层在安装及工作时的应力,给出了JC型双作用弹性旁承体在安装时的相关建议。