排序方式: 共有87条查询结果,搜索用时 15 毫秒
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信号控制平面交叉口非机动车交通安全分析 总被引:1,自引:0,他引:1
运用统计方法研究非机动车与机动车的交通冲突,分析了非机动车在信号控制道路平面交叉口的交通安全.研究表明,非机动车交通流率的增加将导致非机动车和机动车交通冲突的增加.对于机动车车头时距和非机动车及机动车的行驶速度而言,存在一个非机动车和机动车交通冲突的高发区域;而在该区域的左右两侧,交通冲突趋于减少.最后,针对非机动车交通安全的内在机理提出5项改善措施. 相似文献
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在路面基层施工中,施工机械设备的配置及性能是决定路面基层施工质量的关键。结合工程实践,从施工机械设备配置入手,对施工机械设备的性能及使用进行分析,该方法为快速、高质量修建高速公路提供技术保障。 相似文献
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一种基于TLX量表的公路设计负荷综合评价方法解决了公路设计任务负荷难以量化评价的问题。结合工程实例。采用该法对设计负荷进行计算,得到了量化的评价结果,验证了该方法的可行性和可操作性。 相似文献
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多孔沥青混合料具有改善生态、热环境、光环境、防洪、吸声降噪和提高行车安全等优势,但不同空隙结构沥青混合料对径流污染控制和温度的调节功能还不明确.因此,重点研究不同空隙结构沥青混合料的热物参数,并通过室内模拟太阳辐射试验系统,研究不同空隙结构沥青路面内部温度变化规律,得出增大沥青混合料的空隙率,能够降低其导热系数,从而降低沥青路面内部的温度;同时在明确径流污染主要评价指标的基础上,研究了不同空隙结构沥青混合料控制径流污染的效果,进而明确了不同空隙结构沥青混合料的热阻和控制径流污染效能.最后,从透水、承载、耐久和生态效能综合考虑,建议多孔沥青混合料的有效空隙率应为15%~20%,为今后设计出生态环保型透水路面提供依据. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(11):1401-1437
There are many situations where physical testing of a vehicle or vehicle controller is necessary, yet use of a full-size vehicle is not practical. Some situations include implementation testing of novel actuation strategies, analysing the behaviour of chassis feedback control under system faults, or near-unstable situations such as limit handling under driver-assist feedback control. Historically, many have advocated the use of scale vehicles as surrogates for larger vehicles. This article presents analysis and experimental testing that examines the fidelity of using scaled vehicles for vehicle chassis dynamics and control studies. In support of this effort, this work introduces an experimental system called the Pennsylvania State University Rolling Roadway Simulator (the PURRS). In the PURRS, a custom-built scale-sized vehicle is freely driven on a moving roadway surface. While others have used scale-vehicle rolling roadway simulators in the past, this work is the first to attempt to directly match the planar dynamic performance of the scale-sized vehicle to a specific full-sized vehicle by careful design of the scale vehicle. This article explains details of this effort including vehicle dynamic modelling, detailed measurement of model parameters, conditions for dynamic similitude, validation of the resulting experimental vehicle in the time, frequency, and dimensionless domains. The results of the dynamic comparisons between scale- and full-sized vehicles clearly illustrate operational regimes where agreement is quite good, and other regimes where agreement is quite poor. Both are useful to understand the applicability of scale-vehicle results to full-size vehicle analysis. 相似文献
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道路疲劳试验的内容之一,就是用车辆在被测路基上进行反复多次的碾压,并将碾压的次数,作为综合分析被测路基的一个重要参数.道路疲劳试验常见的计数方法,多采用人工计数或用机械传动控制点动开关的电子计数.本文在分析了上述两种计数方式存在的弊病后,提出了一种原理先进、性能优越的非接触式计数器,经实践证明,效果良好. 相似文献