制动梁端轴折断的原因分析及对策

对制动梁端轴折断的原因进行了分析，指出了主要的４种原因和现有规章制度中存在的漏洞，并针对原因和漏洞提出了相应的对策。     

复杂地质深水长大钻孔桩施工关键技术

结合国道主干线广州绕城公路西二环南段北江特大桥主桥主墩2.5 m桩基施工,介绍了复杂地质深水长大钻孔桩施工工艺和方法,重点阐述了复杂地质深水钻孔平台设计与搭设、直径280 cm钢护筒制作与安装、"先冲击、再旋钻"钻孔方法、气举反循环泥浆循环方式、高级PHP泥浆的调配应用及施工控制、桩基成孔、钢筋笼制作与安装及水下混凝土灌注等关键施工技术。     

城市轨道交通互联互通网络化行车组织方案初探

互联互通是城市轨道交通未来发展趋势之一,通过组织互联互通网络化运营,不仅可以有效减少乘客换乘次数,节约出行换乘时间,而且可以有效提高列车及其他设施设备的利用率,降低运营成本。基于重庆牵头开展的城市轨道交通互联互通示范工程,在设备设施已实现互联互通的基础上,通过研究列车运营组织的互联互通,总结列车跨线交路方案设计原则和步骤,研究确定快慢车行车组织下越行站数量,归纳互联互通列车开行方式及行车间隔的公倍数规律、周期性规律。在此基础上,以重庆轨道交通互联互通行车组织进行验证,以期为行业提供一定的借鉴和参考。     

基于最优控制的静水面多船避碰控制研究

多船避碰在船舶的导航与控制领域是一个非常困难的问题,传统的几何避碰方法较难处理这类问题。文中采用最优控制方法,从船舶的运动方程出发,由避碰的实现过程设计目标函数,采用广义梯度方法求解。仿真实验结果显示,在静水面情况下,该方法能得到较好的避碰效果。     

An adaptive model for highway travel time prediction

Traffic congestion caused by either insufficient road capacity or unexpected events has been a major problem in urban transportation networks. To disseminate accurate traveler information and reduce congestion impact, it is desirable to develop an adaptive model to predict travel time. The proposed model is practically implementable to capture dynamic traffic patterns under various conditions, which integrates the features of exponential smoothing and the Kalman filter by utilizing both real‐time and historic data. The model is simple in formulation while robust in performance in terms of accuracy and stability. With a constraint or nonconstraint smoothing factor, the proposed model is tested with both real world and simulated data and demonstrated itself a sound model that outperforms others (e.g., Kalman filter and simple exponential smoothing) specifically under recurring and nonrecurring congestion. Copyright © 2012 John Wiley & Sons, Ltd.     

Toll pricing framework under logit‐based stochastic user equilibrium constraints

This paper addresses the toll pricing framework for the first‐best pricing with logit‐based stochastic user equilibrium (SUE) constraints. The first‐best pricing is usually known as marginal‐cost toll, which can be obtained by solving a traffic assignment problem based on the marginal cost functions. The marginal‐cost toll, however, has rarely been implemented in practice, because it requires every specific link on the network to be charged. Thus, it is necessary to search for a substitute of the marginal cost pricing scheme, which can reduce the toll locations but still minimize the total travel time. The toll pricing framework is the set of all the substitute toll patterns of the marginal cost pricing. Assuming the users' route choice behavior following the logit‐based SUE principle, this paper has first derived a mathematical expression for the toll pricing framework. Then, by proposing an origin‐based variational inequality model for the logit‐based SUE problem, another toll pricing framework is built, which avoids path enumeration/storage. Finally, the numerical test shows that many alternative pricing patterns can inherently reduce the charging locations and total toll collected, while achieving the same equilibrium link flow pattern. Copyright © 2013 John Wiley & Sons, Ltd.     

GPS货运信息管理系统的开发与应用

利用编程技术和系统集成技术将WiFi技术、RFID技术、GPS差分定位、GIS技术等应用到港口生产中,实现了集输港车辆、货物申报、过磅、现场装卸的“全程式”监控.     

大型集装箱船舱盖布置适应性研究

随着国际航运市场的发展,大型集装箱船不断涌现。文章拟通过分析大型集装箱船的船体变形,研究如何对舱盖板进行合理分块,协调布置舱口盖相关装置,以充分满足航行过程中舱口盖适应船体结构大开口变形的问题。     

基于最小二乘法的气象信息组网技术及实现磁

根据最小二乘法设计了一种陆战场大区域气象信息数据组网架构,改变了传统的气象保障途径和模式,提高了远程火力打击气象保障能力,给出了基于组网技术的气象信息数据随空域变化的全弹道精确调用实现方法。     

基于 FLAC -3D 强度折减法的边坡稳定性影响因素敏感性分析

通过建立均质土坡模型,利用 FLAC -3D 软件的强度折减法,求解边坡稳定系数,系统地研究了边坡稳定性影响因素的敏感性问题。利用边坡稳定安全系数以及塑性贯通区作为边坡失稳的判据,通过每次改变一个参数变量来确定稳定系数 。