Airport apron roundabout – Operational concept and capacity evaluation

The paper presents one of the initial steps in the evaluation process towards possible implementation of an innovative taxiway intersection design at Munich Airport apron. A roundabout is proposed as a potential solution for the 12-line intersection area expected at redesigned Apron 3. Although it is a common solution used in road transport for complex intersections, the roundabout has never previously been used for airport surface operations nor has its possible use been considered or analyzed. The paper presents preliminary design and operations concepts of the apron roundabout, followed by its capacity evaluation under Munich Airport operating conditions. The aim was to analyze whether a roundabout is suitable to replace a conventional intersection, in terms of capacity.     

A bi-level model for single-line rail timetable design with consideration of demand and capacity

This paper proposes a bi-level model to solve the timetable design problem for an urban rail line. The upper level model aims at determining the headways between trains to minimize total passenger cost, which includes not only the usual perceived travel time cost, but also penalties during travel. With the headways given by the upper level model, passengers’ arrival times at their origin stops are determined by the lower level model, in which the cost-minimizing behavior of each passenger is taken into account. To make the model more realistic, explicit capacity constraints of individual trains are considered. With these constraints, passengers cannot board a full train, but wait in queues for the next coming train. A two-stage genetic algorithm incorporating the method of successive averages is introduced to solve the bi-level model. Two hypothetical examples and a real world case are employed to evaluate the effectiveness of the proposed bi-level model and algorithm. Results show that the bi-level model performs well in reducing total passenger cost, especially in reducing waiting time cost and penalties. And the section loading-rates of trains in the optimized timetable are more balanced than the even-headway timetable. The sensitivity analyses show that passenger’s desired arrival time interval at destination and crowding penalty factor have a high influence on the optimal solution. And with the dispersing of passengers' desired arrival time intervals or the increase of crowding penalty factor, the section loading-rates of trains become more balanced.     

沥青混合料搅拌设备选配导热油加热器的方法

为解决当前施工单位在沥青混合料搅拌设备选配导热油加热器时存在的实际问题，通过给出的导热油加热器的发热量、导热油循环泵流量和扬程以及沥育罐热交换面积的具体计算方法，从而可方便地选择适宜设备实际工况的导热油加热器。     

基于模拟退火技术的舰载米波搜索雷达信号的方向估计

本文阐述了舰载米波雷达天线阵转动时多目标回波信号的模型,提出了采用模拟退火线性优化神经网络实现舰载米波搜索雷达天线阵转动时多目标回波信号的方向估计。仿真结果表明该是有效的,并且具有速度高、准确的优点。     

弧形支座更换橡胶支座的设计方案

弧形支座上摆螺栓折断已成为既有线小跨度钢筋混凝土梁的一种突出病害。介绍弧形支座产生病害后,更换橡胶支座的一种整体设计思路,对橡胶支座的选择以及设计的其他环节进行详细地介绍。     

有轨电车运营模式与运输能力研究

在我国多个城市有轨电车的建设与运营过程中,系统运输能力及其提高措施难以确定。结合国内外已运营线路的经验与新线设计中的模拟分析,对有轨电车运营模式、运输能力以及服务标准进行研究,探讨运输能力影响因素与关键技术标准,提出在半专用路权、路口开放的线路条件下,有轨电车的运营模式应灵活设置,路口控制周期控制在150 s以内,最小发车间隔在高峰时段建议3～6 min,舒适度标准建议采用5～6人/㎡的站席标准;提出优化有轨电车运输能力的措施,如行车计划与信号优先系统匹配、提高有轨电车在封闭区间的运行速度等。     

深圳地铁二期工程建设期安全事故分析

通过统计与分析深圳市地铁二期工程在建设期所发生的安全事故,发现坍塌是地铁工程建设期间的多发事故,地铁工程在基坑工程、盾构推进、隧道暗挖和高支模施工的过程中易发生安全事故.结合地铁建设过程中的主要工法,通过进一步分析,发现对辅助工法施工重视不够,临时承重结构施工时抢工期常常是引发事故的重要原因.结合工程事故的分析及建设管理经验,提出事故预防的重点,以期为下阶段大规模的地铁工程建设活动提供安全管理经验.     

信号控制平面交叉口通行能力与信号周期之间的关系

探讨了信号控制交叉口的通行能力与信号周期之间的关系,研究发现信号交叉口进口道的通行能力并不一定随信号周期之增加而增加;给出进口道通行能力与信号周期之间关系的判断准则,并运用该准则进一步分析整个交叉口的通行能力与信号周期的关系。     

粉喷桩复合地基承载力的评定方法

介绍了利用静载试验确定粉喷桩复合地基承载力的试验装置,试验方法及其承载力评定方法。