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Abstract In response to an initiative to develop an advanced traffic information system in Bangkok, this paper explores practical guidelines for the optimal location of road sensors, such that the data collected on spot speeds reflect an entire link's average speed. In particular, the authors use microsimulation software to investigate optimal detector locations, using the sum of squared errors and root mean squared errors. The analysis hypothesizes that road segments are 0.4, 0.6, 0.8, 1.0, 2.0 and 3.0 km in length and are specially designed to replicate typical arterial streets in Bangkok. The results show that a single detector location can produce good estimates of link speed only for segments that are shorter than 1.0 km. For distances of 1.0 km or more, the results suggest that two detectors be used for good link speed estimates under all traffic conditions. 相似文献
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路面平整度是衡量路面质量的重要标准,也是运输经济的一个重要指标。 综合当前路面平整度状况,对现有路面平整度的检测方法和相关问题进行了总结,以促进相应方法在路面质量检测中的合理使用与推广。 相似文献
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本文综合考虑交通流数据的质量及其成本等因素,对服务于ATMS的移动型检测器最小样本量的确定原则进行设计,建立一种基于行程时间估计最小样本量的确定方法,并利用微观仿真模拟软件对城市道路不同服务水平下的交通运行状态进行模拟分析。通过设置不同的检测器样本量方案,并利用优化方法对不同方案采集的交通流信息进行分析,确定合理的移动型检测器最小样本量。 相似文献
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H. Yamazaki Y. Karino T. Kamada M. Nagai T. Kimura 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2008,46(4):255-270
It is important to consider the robustness when designing brake control systems, because of the model's uncertainties that result from the nonlinear characteristics of wheel-to-rail adhesion forces and brake material friction coefficients. This paper presents the experimental results from the new wheel-slip prevention control using nonlinear robust control theory. The authors performed experiments for the proposed wheel-slip prevention control to compare it with the conventional control laws. The experimental results proved the comparative effectiveness of the proposed control and showed high brake performance under nonlinear characteristics of brake dynamics. 相似文献
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Hui Liu Juan Su Xu Liang Xi Zhang Ya-Jun He Hai-Qiang Huan Ji Ye Wei-Dong Zhang 《西安交通大学学报(英文版)》2011,1(1)
A novel and sensitive HPLC-UV method has been developed for the simultaneous determination of twelve major compounds in Longdan Xiegan Pill.The chemical profile of the twelve compounds,including geniposidic acid(1),geniposide(2),gentiopicroside(3),liquiri 相似文献
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IntroductionThemainfeatureoftheC-DTListhatithasaphaseerrordetectorwithlinearcharacteristics,whichmeansthatithasawiderlock-inr... 相似文献
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A simple and accurate high-performance liquid chromatography(HPLC)coupled with diode array detector(DAD)and evaporative light scattering detector(ELSD)was established for the determination of six bioactive compounds in Zhenqi Fuzheng preparation(ZFP).The 相似文献
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文章针对可调桨桨叶在受到重大损伤经焊补修复后对桨叶螺距和可调桨静平衡的检测进行了探索和研究,设计适合可调桨修理专用的检测装置,成功地消除可调桨所存在的螺距和静不平衡量偏差超差的缺陷,有效地提高了可调桨修理的检测精度,取得了显著的效果。 相似文献