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171.
按照TB/T 3225—2010《铁道货车交叉杆组成》要求,选择液压伺服作动器实现交叉杆组成的水平载荷加载和垂直方向扭转位移施加,从水平运动机构和扭转运动机构2方面出发,研制交叉杆组成疲劳试验台。试验台经转K2/K6型和转8G/转8GA转向架用交叉杆组成验证,功能满足标准要求,且使用方便,节约成本。 相似文献
172.
Dewan Md Zahurul Islam J. Fabian Meier Paulus T. Aditjandra Thomas H. Zunder Giuseppe Pace 《Research in Transportation Economics》2013
In this paper an introduction to the principles and methods used in logistics and supply chain management is presented. It begins by a discussion on fundamentals and explains the relevant terms. Next policy and practice associated with logistics and freight services are regarded with a focus on the EU policy for the sector which greatly influences the development of logistics chains and services. Mathematical formulation of typical transport and logistics-related problems is also presented followed by a discussion on the concept of sustainability. 相似文献
173.
将货物、车体和摇枕作为1个系统,基于弹簧悬挂装置垂向受力的变化,提出货车垂向平稳性评价指标。运用建立的货车在曲线上运行时的垂向平稳性模型,以C64k敞车为例,研究4种典型装载工况下重车重心高、货物重心横向和纵向偏移量与货车通过小半径曲线时垂向平稳性的关系。研究表明:用作用在每个弹簧悬挂装置的垂向载荷变化判定货车运行的垂向平稳性,可更直观描述货车装载工况对车辆垂向平稳性的影响;对货车的垂向平稳性影响以货物重心的纵向偏移量最大,而重车重心高度的影响最小;计算结果为确定合理的重车重心高度以及货物重心横、纵向偏移量的限制值提供了科学依据。 相似文献
174.
In this paper we use advanced choice modelling techniques to analyse demand for freight transport in a context of modal choice. To this end, a stated preference (SP) survey was conducted in order to estimate freight shipper preferences for the main attributes that define the service offered by the different transport modes. From a methodological point of view, we focus on two critical issues in the construction of efficient choice experiments. Firstly, in obtaining good quality prior information about the parameters; and secondly, in the improved quality of the experimental data by tailoring a specific efficient design for every respondent in the sample.With these data, different mixed logit models incorporating panel correlation effects and accounting for systematic and random taste heterogeneity are estimated. For the best model specification we obtain the willingness to pay for improving the level of service and the elasticity of the choice probabilities for the different attributes. Our model provide interesting results that can be used to analyse the potential diversion of traffic from road (the current option) to alternative modes, rail or maritime, as well as to help in the obtaining of the modal distribution of commercial traffic between Spain and the European Union, currently passing through the Pyrenees. 相似文献
175.
道路汽车甩挂运输在货物运输效率和节能减排效果上有显著的效益,正逐步得到社会各界的广泛关注。文章基于广西甩挂运输发展现状,预测分析广西发展道路甩挂运输的市场前景,并提出了广西发展甩挂运输的对策。 相似文献
176.
张庆琛 《铁路通信信号工程技术》2020,(6):110-114
介绍适用于印度东部货运专线D S6-60型联锁系统的操作显示规范的主要特点,对海外控显产品的研究与实现做一举例说明. 相似文献
177.
178.
Companies working in a collaboration are able to achieve higher vehicle capacity utilisation and reduced empty running, resulting in lower costs and improved sustainability through reduced emissions and congestion. Collaboration produces higher volumes of goods to be moved than individual companies which means that further efficiencies may be possible by relaxing the freight mode constraints and considering rail and higher capacity vehicles. This paper explains how real world data has been used in a model to quantify the economic and environmental benefits in the FMCG sector delivered through collaboration utilising road and rail freight modes. Data for one month was provided by 10 FMCG companies and included freight transport flows between depots and customers, inter depot movements, and supplier collections. Detailed road and rail costs and operating characteristics were obtained and, with the transport flows, applied to a network design model which was used to validate the company data sets. A strategy examining the potential use of alternative higher capacity vehicles and rail for the flows between nine regional consolidation centres showed cost and CO2 savings. Just under half the inter-regional flows benefited from double deck trailers, longer heavier vehicles for 30% of the flows and rail with different wagon configurations for the rest. In summary there was a 23% reduction in cost with 58% fewer road kilometres and a 46% reduction in CO2 emissions. The ability to backhaul the same mode of transport between most of the regional centres was one of the strengths of this strategy. 相似文献
179.
The paper defines the field of Freight Demand Management (FDM), and positions it as an important component of transportation policy and management. To establish the rationale for FDM, the paper studies the effects of the agent interactions at the core of supply chains, and identifies the important role played by the receivers of supplies in determining when and how deliveries are made. The paper classifies the various modalities of FDM, and summarizes the real-life experiences of their implementation. To illustrate the potential of FDM, the paper analyzes Receiver-Led Consolidation (RLC) programs. The paper provides background on consolidation programs, and estimates a behavioral model to shed light on the factors explaining receivers’ interest in cargo consolidation. The resulting model is used to estimate expected participation in a RLC program in New York City. These results are complemented with freight-trip generation analyses, and a behavioral micro-simulation to estimate potential reductions in freight traffic and vehicle-miles-traveled. The results show that RLC programs could bring significant benefits to large metropolitan areas, reducing freight vehicle-miles-traveled and congestion levels. 相似文献
180.
Understanding the relationship between socioeconomic factors and the Less-than-Truckload (LTL) freight flows is important for transportation planners and policy makers. This paper explores the impacts of information technology, urbanization on LTL freight flows by using a spatial autocorrelation model with freight flow data from a leading LTL company in China. The results show that all IT variables and urbanization variables have positive effects on freight flows. Distance, as expected, is negatively correlated with the freight flow volume. The application of the spatial autocorrelation model further shows that origin dependence, destination dependence and OD dependence are all significant, justifying the consideration of spatial interdependence. Finally, policy implications are discussed based on the estimated results. These findings shed light on the impacts of internet and urbanization on freight transportation, and contribute to the design of freight policies and the development of the LTL industry. 相似文献