信号控制技术的智能化创新应用研究

随着我国城市发展的进一步加速,城市交通问题日益突出,交通拥堵呈现多面化、扩大化的趋势。针对典型交通拥堵问题,利用交通控制技术,在其应用方面提出了几种交通信号控制的智能化应用新方法,包括拥堵协调控制、行人过街控制、逆向可变车道控制、"集装箱"移动式智能信号控制系统等。经过长时间的实际运行,应用系统控制方法在维持交通秩序、缓解交通拥堵、疏导交通组织方面都取得了显著效果。     

基于复杂网络的交通序列数据特性

为了进一步研究交通流特性,采用复杂网络方法对交通序列数据进行分析。提出了箱型图-聚类算法模型用于识别和填充初始数据中的缺失值和异常值;通过相空间重构方法将一维数据重构为网络节点,选取连接阈值确定网络节点的连接关系,将交通序列数据构建为复杂网络,对复杂网络的结构和定量指标进行分析。研究结果表明交通序列数据复杂网络的结构一定程度上可以反映路段的交通流状态。该结果有助于优化数据预处理方法,拓展复杂网络在交通序列数据研究中的应用。     

Study on the Reduced Traffic Congestion Method Based on Dynamic Guidance Information

This paper studies how to generate the reasonable information of travelers' decision in real network. This problem is very complex because the travelers' decision is constrained by different human behavior. The network conditions can be predicted by using the advanced dynamic OD(Origin-Destination, OD) estimation techniques. Based on the improved mesoscopic traffic model, the predictable dynamic traffic guidance information can be obtained accurately.A consistency algorithm is designed to investigate the travelers' decision by simulating the dynamic response to guidance information. The simulation results show that the proposed method can provide the best guidance information. Further,a case study is conducted to verify the theoretical results and to draw managerial insights into the potential of dynamic guidance strategy in improving traffic performance.     

Incident Detection Method of Expressway Based on Traffic Flow Simulation Model

The expressway traffic incidents have the characteristics of high harmful, strong destructive and refractory. Incident detection can guarantee smooth operation of the expressway, reduce traffic congestion and avoid secondary accident by informing the accident, detection and treatment timely. In this paper, an incident detection method is proposed using the toll station data that takes into account the traffic ratio at the entrances and crossway in the network. The expressway traffic simulation model is improved and a simulation algorithm is established to describe the movement of the vehicles. A numerical example is experimented on the expressway network of Shandong province. The proposed method can effectively detect the expressway incidents, and dynamically estimate the traffic network states so as to provide advice for the highway management department.     

Condition-Based Maintenance Decision-Making for Equipment

At present, condition monitoring and fault diagnosis technology and their application in engineering have been widely studied. Relatively little attention has been paid to condition-based maintenance decision-making for equipment. In this paper,based on the decision-making policy in traditional condition-based maintenance,the connotation of condition-based maintenance for equipment was defined, and its characteristics were analyzed.Working contents of condition-based maintenance for equipment were provided,which were divided into three stages. The influence factors in condition-based maintenance for equipment were analyzed. The key links of equipment maintenance contents and decision-making process were proposed. The condition-based maintenance decision-making policy presented in this paper can provide a practical reference for equipment maintenance.     

Brusselator系统的Hopf分岔

本文主要研究Brusselator系统的动力行为.首先,分析了系统产生Hopf分岔的原因,然后详细讨论了Brusselator系统平衡点的稳定性,并且证明了Brusselator系统当临界平衡点失稳时会产生超临界Hopf分岔,即从平衡点处分岔出稳定的极限环,进而得到了Brusselator系统出现Hopf分岔所需的参数条件;最后,数值模拟的结果显示了与理论分析的一致性.     

基于复杂网络的城市交通系统复杂性概述

主要同顾了复杂网络在城市交通网络中的相关研究概况,包括城市交通网络拓扑结构复杂性、道路交通流与复杂网络及网络交通流与复杂网络之间相结合的研究,并就交通系统特有的属性提出了综合应用复杂网络、系统科学、非线性动力学、城市交通等理论来研究城市交通复杂性的重要意义。最后对进一步需要讨论和分析的问题进行了展望。     

提高循环水浓缩倍率的措施

循环水系统作为降低工业生产用水成本与保护环境的重要方式，是当前社会重点关注的内容。循环水浓缩倍率是重要的经济指标，对循环水系统运行产生了至关重要的影响。针对目前循环水补水为矿井水，水质较差，导致循环水水质恶化的情况，提出合理化的水处理措施，避免了系统腐蚀、结垢的风险，浓缩倍数由2.3提高到目前的4倍。