基于系统规划的公路桥收费策略

在我国有公路桥的城市很多,为此制定相应的基于系统最优的公路桥收费策略,不仅可以方便居民的正常出行,还有助于政府利用桥梁收费达到城市交通平衡和解决市政桥梁建设资金问题的双重目的。     

高速公路通信系统的发展规划与思考

高速公路通信系统是高速公路的重要组成部分,可为道路的安全运行、高效运输、科学管理、优质服务提供可靠、快速的信息传输手段．最大限度地发挥高速公路安全、畅通、经济、便捷、舒适的特点,从而确保高速公路获得最佳的规模效益和社会效益．故应科学合理地利用高速公路的通信资源,以在实现国家高速公路网规划的同时,也形成一个具有规模的通信系统。     

路面铣刨刀具失效机理与形式分析

对路面铣刨刀具结构组成、切削时象、工作状态和失效机理的进行了简洁的论述。着重分析了刀具正常失效和非正常失效产生的原因．提出了保证刀具正常失效的措施。     

工期固定多目标资源优化的方法

资源是指为完成工程任务所需的劳动力、材料、机械设备和资金等的统称。资源优化就是通过改变工作的实施时间,使资源按时间的分布能够符合优化目标。     

高速公路动态交通流Elman神经网络模型

为了提高高速公路交通流建模的精度,分析了离散的高速公路动态交通流数学模型,基于Elman网络原理,建立了回归神经网络交通流模型。回归神经网络的输入层、上下文层、隐含层和输出层的节点数目分别选为8、30、30和2,采用Levenberg-Marquardt算法对回归神经网络进行训练,并对一条5路段的高速公路进行仿真。结果表明:回归神经网络平均相对误差为8.683 7×10-5,最大相对误差为4.237 1×10-4,与BP神经网络和RBF神经网络相比较,Elman回归神经网络能更好地逼近交通流数学模型,真实地描述交通流基本特性,能准确地建立动态交通流模型,适应交通状况的变化。     

基于串联排队网络的三峡-葛洲坝水利枢纽联合调度模型

为了提高三峡-葛洲坝水利枢纽的整体通过能力,分析了三峡-葛洲坝水利枢纽联合调度的实际需求,建立了三峡-葛洲坝水利枢纽联合调度数学模型,考虑了闸室面积利用率最大、整体待闸时间最小两个目标函数和船舶编排过程中的八个约束,应用串联排队网络理论求解模型。算法将申报船舶按照航向分成四个船舶序列,动态计算每艘船舶的权重,兼顾船舶长度与宽度优先,待闸时间约束、葛洲坝船闸通航条件限制和任务均衡的要求,循环排船,逐步优化。应用结果表明应用该数学模型和编排算法编制一个计划期的两坝五闸计划仅需2 min,编排时间短,葛洲坝2#船闸的闸室面积利用率高于70%,并且客船和旅游观光船均排在前面的闸次中,说明客船的待闸时间约束是满足的,并且在航向上是上下航向交替运行,没有出现倒闸情况,编制的计划满足实际调度需要。     

成都铁路枢纽客运系统的分析与研究

以成都铁路枢纽客运系统为研究对象,作者讨论了客运专线引入枢纽对客运系统的影响,城市形态及其发展规划与铁路客运站选址的相互关系,铁路与城市交通网络体系中其它运输方式的衔接方式、换乘关系及协调发展;提出了未来三十年成都铁路客运系统车站的分工布局、客货线路在枢纽内的走向及疏解原则,同时提出近期新成都站的建设方案以及市内各种交通运输系统与之协调共谋发展的措施。     

Foldable container in empty container repositioning in intermodal transportation network of Belt and Road Initiative: strengths and limitations

In 2013, the concept of the ‘Silk Road Economic Belt and the 21st-Century Maritime Silk Road (Belt and Road)’ was initiated by the Chinese government, which involves Asian, European and African continents and their adjacent seas. Logistics plays a core role in such a large framework of economy and trade. In recent years, China, European Union, and Southeast Asia pay much attention to the design and development of the intermodal transportation network towards both economic and environmental efficiency. In this paper, we propose an empty container repositioning model in the intermodal transportation network of Belt and Road (B&R) Initiative by considering both standard and foldable containers. In this model, empty containers are repositioned from the inland of the original area, such as China, to other areas of B&R Initiative related countries and regions, such as European Union and Southeast Asia. We develop a mixed integer linear programming model to determine the optimal repositioning of empty containers via the intermodal transportation network. An Artificial Bee Colony algorithm is developed to solve large size problems in practice and numerical experiments are conducted to show the efficiency of our proposed algorithm. We provide managerial insights regarding the impact on the network performance of foldable containers transportation.     

Effects of the ‘Belt and Road’ initiative on the wine import logistics of China

China’s Belt and Road (BR) initiative is expected to facilitate international trade between the countries involved. In this study, we review the special requirements of wine logistics and the market growth potential of wine consumption in China. A model minimizing generalized logistical costs is developed and applied to wine imports in China, so that the best candidate cities in which to locate transport gateways and distribution centers can be identified. Our analysis suggests that the most preferred gateways are Shanghai, Tianjin, Guangzhou, and Hong Kong, which all have similar delivery costs. In comparison, Beijing and Chongqing have much higher delivery costs, mainly because they do not have good access to marine transport and/or efficient domestic distribution networks. For long-distance intercontinental transport of large volumes of wine, marine shipping remains the only viable delivery mode. However, wine distribution within China extensively uses air, road, and water transport. Therefore, cities with excellent multi-modal transport services are better positioned to become wine logistics gateways. Our study also highlights the importance of value-added services and good government support, which are important factors that influence distribution costs and quality.     

基于船舶供电网络的模拟系统设计

本文主要介绍了基于船舶供电网络的模拟系统的主要功能和设计方法,该模拟系统采用集中式管理分布式控制的硬件架构,可模拟在各种不同的电网结构和不同的运行工况下,电网中各设备的状态和参数,并通讯至能量管理系统,能便捷的验证能量管理系统功能的有效性,提高软件开发人员的故障效率。