燃油箱系统等效应力分析及改进

为了研究矿用自卸车燃油箱系统支架与车架纵梁之间的角焊缝出现开裂的原因,建立有限元模型,考虑路面不平度的影响,通过有限元分析软件Adina对不同充液高度条件下的两种燃油箱壁厚进行流固耦合数值计算。计算结果表明在不同充液高度条件下降低燃油箱壁厚时,车架纵梁上的最大等效应力出现不同程度的降低。     

The effect of road traffic noise on the prices of residential property – A case study of the polish city of Olsztyn

The key factors that determine the prices of real estate are location, technical standard of property as well as the local environment. In urban agglomerations, road traffic noise has a considerable impact on the purchasing decisions made by apartment buyers. This is a widespread problem in Central-Eastern Europe. The main objective of this study was to verify the working hypothesis that apartment prices are correlated with traffic noise levels in Olsztyn, the capital city of the Region of Warmia and Mazury in north-eastern Poland.The study was carried out in four principal stages. Firstly, traffic noise intensity was determined for apartments (objects of real estate transactions concluded in 2013), based on an acoustic map for the city of Olsztyn. The map was developed in line with the provisions of Directive 2002/49/EC of the European Parliament and of the Council of 25 June 2002 relating to the assessment and management of environmental noise. Secondly, the values of the Noise Depreciation Sensitivity Index (NDSI) were calculated. NDSI determines the percentage change in property prices per dB increase in noise levels. The distribution of unit prices of apartments was mapped relative to noise levels, and the relationships between the analyzed variables were assessed. Thirdly, linear correlations between the unit prices of apartments and noise levels were analyzed. The strength and direction of relationships between the analyzed parameters were determined based on Pearson’s correlation coefficient. In the last stage, the distribution of the unit prices of apartments was mapped by ordinary kriging, a geostatistical estimation method. The research hypothesis was confirmed by comparing the spatial distribution of traffic noise levels measured in stage 1 with the spatial distribution of apartment prices.     

Achieving political acceptability for new transport infrastructure in congested urban regions

This paper analyzes the efficiency and political acceptability of road pricing and infrastructure policies targeted at relieving urban congestion. It combines a stylized transport model of an urban road network with a model of the political process that incorporates interactions between voters, citizen interest groups and politicians to explore the possibilities to reach political acceptability for efficient transport policies. In a numerical illustration, the paper compares a set of pricing and investment policies in terms of efficiency and acceptability. The illustration shows how conflicting interests can lead to non-efficient policies being chosen.     

大粒径ATB水稳定性评价方法研究

沥青稳定碎石基层在我国沥青路面中的应用越来越广泛,其路用性能的优劣对路面使用寿命影响很大。文章通过浸水马歇尔试验和冻融劈裂试验,对不同级配大粒径沥青稳定碎石混合料的水稳定性进行了对比试验研究。与浸水马歇尔试验相比,冻融劈裂试验更能体现不同级配混合料水稳定性的差异,并能较好地模拟混合料水损坏过程,是评价大粒径沥青稳定碎石混合料水稳定性的优选方法。     

武汉九峰城市森林保护区林荫路的规划与设计

基于九峰城市森林保护区林荫路作为低速观赏性道路的特殊功能分析,提出其交通性、观赏性及生态性的规划设计理念,并从道路布线中直线、曲线段的合理布设．以及道路断面布置中不同功能带、本身绿化和路边休憩点布设等方面探讨规划的具体设计方法,以此构建“路在林中．人在景中”的景观道路氛围。     

冷再生技术在国道324线岑容公路中的应用

目前,冷再生技术广泛用于旧路的维修、改造及升级中。文章结合国道324线岑溪一容县一级公路沥青砼路面大修工程实践,介绍了路面基层冷再生技术及施工工艺。从实施效果来看,冷再生技术有保证质量、施工速度快、工程造价低和节能环保等优点,是一种较实用的公路沥青路面大修养护新的技术。     

打造人文、科技、绿色的展西路

断头路历来是城市路网建设中的疑难杂症,影响了路网的整体功效。在奥运三大理念指导下,针对北京展西路断头的控制因素,通过与城市设计、环境评测、景观设计等相结合的一体化设计,把展西路建设地极具人文、科技、绿色特征,体现北京科学发展观的三大核心理念,成为类似项目的典范。该文介绍的有关设计经验,可供道路专业人员参考。     

制定筑路机械油耗定额之我见

本文浅谈了在制定筑路机械燃油消耗定额时应考虑的几个因素,给出了测定计算机械台班油耗定额的参考计算公式。     

换乘模式下货物运输路径问题

目前货运企业主要采用直达运输方式,但随着收货人对供应链时效要求的提高,现有 的运输方式限制了货运企业的发展。为充分利用现有公路运输能力,文章研究换乘模式下的 货物运输路径问题,扩大运输辐射范围。针对此问题,建立了以所有货物的在途时间最短为目标的数学模型,设计了相应的算法,最后结合实例数据,以 Python 语言求解货物运输时间, 得出最优的运输路径。有效减少了公路货物运输的在途时间,降低了货运企业的成本,而且 在满足收货人需求的同时减少了货车的碳排放量。