Information
Edited & Published: Editorial Office of Journal of Dalian Jiaotong University
Publication Period: Bimonthly
Publisher: Dalian, Liaoning Province, China
Language: Chinese
Superintendent: Liaoning Provincial Department of Education
Sponsored by: Dalian Jiaotong University
Editor in Chief: Chen Bingzhi
Executive Editor in Chief: Guo Ruijun
China National unified serial number: CN 21-1550/U
International Standard Serial Number: ISSN 1673-9590
Periodical website: https://dltd.cbpt.cnki.net
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Traffic Signal Control Using License Plate Recognition Data: A Review
LI Ruimin;NG Jiehui;LIU Yilin;The license plate recognition data obtained from video detectors features a high sampling rate, wide coverage, and contains various dynamic and static traffic state information. This paper systematically reviews and analyzes the relevant research on optimizing traffic signal control based on license plate recognition data over the past 20 years at home and abroad. The research shows that license plate recognition data can support the estimation of multiple traffic state parameters such as travel time, traffic flow, and queue length. It not only provides decision support for traffic signal control optimization(such as timing optimization and subarea division), but also offers real-time evaluation feedback for the implementation of signal timing optimization schemes. Currently, license plate recognition data mainly supports three aspects in the field of signal control optimization: traffic signal timing optimization, signal control subarea division, and signal control evaluation. However, its potential value and information capacity in the "analysis-optimization-evaluation" closed-loop feedback mechanism have not been fully exploited. Future research can further explore the following aspects: the innovative integration of license plate recognition data with intelligent connected vehicle trajectory data, the application of new technologies such as reinforcement learning, hybrid learning, and large models, the expansion of new directions in signal control optimization, and the development of control and simulation modeling methods for license plate recognition data. The above research aims to provide references for the deeper application of license plate recognition data in the field of traffic signal control.
Optimization of Benchmark Train Stopping Scheme for Intercity Railways Considering Route Accessibility
LIU Di;LIU Jiashuo;WANG Yu;RONG Wenyu;With the rapid development of urban agglomeration economy, the stop scheme of the benchmark train on intercity railways, as the framework of the overall line stop strategy, is particularly important. It plays a crucial role in enhancing the operational efficiency of the line and reducing passengers' travel time. Firstly, a spatio-temporal network of the benchmark train on intercity railways is established, the meaning of line accessibility is clarified and its expression is given. Secondly, with the objective of maximizing line accessibility and minimizing the number of stops, and in combination with constraints such as train stop requirements, the number of stops, and the minimum service frequency limit of stations, an optimization model for the stop scheme of the benchmark train on intercity railways is constructed. A "linear weighting + genetic algorithm" model-solving algorithm is designed. Taking the actual operation data of the Changchun-Hunchun Intercity Railway in the first quarter of 2024 as an example, the validity of the model is verified. The results show that the line accessibility of the optimized scheme is 1.26 higher than that of the actual scheme, with an increase of 10.35%; the number of stops is reduced by 3, with a decrease of 4.17%. Through parameter sensitivity analysis, it is confirmed that line accessibility increases with the increase of the minimum service frequency of stations.
Research on the Optimal Evacuation Path of the Evolution Process of Tank Explosion in Chemical Industrial Park
CUI Tiejun;CUI Lianqing;LI Shasha;Continuous explosions of multiple storage tanks in a chemical industrial park are extremely important and dangerous accidents. Once they occur, personnel must be evacuated immediately. Therefore, considering all possible evolution processes of storage tank explosions in the entire park, a method for determining the optimal evacuation route is proposed. Firstly, the mutual influence of shock waves from storage tank explosions on each other is considered to form the evolution process of storage tank explosion damage. Secondly, the most unfavorable evolution process and its corresponding regional damage probability distribution are determined. Finally, the optimal evacuation route is determined in the regional damage probability distribution according to the direction with the largest gradient of probability distribution change. Through an example of a chemical industrial park with four storage tanks, four evacuation starting points are set in the regional damage probability distribution map under the most unfavorable state, and the optimal evacuation routes for each are obtained, including straight lines, broken lines, and oblique lines, etc. The research shows that the optimal evacuation routes at the same position are different for different evolution processes; the optimal evacuation routes at different positions are different for the same evolution process; and the correct probability of the optimal evacuation route is consistent with the probability of the occurrence of the storage tank explosion evolution process.
Identification of Key Intersections in Unidirectional Traffic Networks Based on Improved K-shell
PEI Yulong;JIN Ziwei;To accurately identify the key intersections in the one-way traffic network of urban roads, firstly, the resistance and evacuation capabilities of the intersections before and after being disturbed are measured based on the Hall three-dimensional structure model, and the initial identification indicators of the key intersections in the one-way traffic network of the city are constructed. Secondly, the TOPSIS model integrating the entropy weight method is utilized to screen the basic indicators for identifying key intersections, and the CRITIC method is employed to construct the decision matrix. Finally, an improved K-shell algorithm using betweenness centrality is proposed to identify key intersections in the one-way traffic network of urban roads. Taking the urban traffic network of some areas in Nangang District, Harbin City as an example for research, the results show that the intersection of Anshan Street and Postal Street has the maximum K value and is the key intersection of this one-way traffic network. With the failure of key intersections, the traffic saturation of the road network has increased significantly. Compared with the current road network, the number of sections with increased traffic saturation has increased by 21.33%, verifying the accuracy of the improved K-shell algorithm in identifying key intersections of the urban one-way traffic network.
The Influence of Streamlining Design on the Aerodynamic Characteristics of Trains on Embankments
QIU Guangyu;ZHANG Wang;ZHANG Baokun;Crosswind can have a negative impact on the aerodynamic characteristics of high-speed trains, and the bogie, as an exposed part, is a key area that affects the overall aerodynamic performance of the train. Using a two-equation turbulence model that can be implemented, numerical simulations were conducted on two types of trains at a train speed of 400 km/h and a crosswind speed of 20 m/s to evaluate the impact of bogie smoothing design on the aerodynamic characteristics of trains on embankments. The differences in the flow field structure between the train and the embankment and its surrounding area under crosswind conditions were studied and compared, with a focus on the flow field structure in the bogie cavity at the train's head. In addition, the changes in the aerodynamic forces of three carriages of the train after the smoothing treatment were explored, and the influence of the bogie area on the overall aerodynamic characteristics of the train was clarified. The research results show that after installing full coverage skirts and underframes, the average differences in resistance, lift, and lateral force of the train compared to the original train are 10.96, 12.09, and 2.45 kN, respectively; the overall resistance of the train is reduced by 27.98 kN, the lift is reduced by 36.25 kN, while the lateral force increases by 6.55 kN. At the same time, the vortices generated in the bogie area are the main cause of the pressure changes on the leeward side of the train. This study provides an important reference for the operation safety and aerodynamic energy-saving design of the next generation of high-speed trains.
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