An experimental study on the characteristics of vibration source in urban rail transit turnouts

2019 ◽  
Vol 234 (9) ◽  
pp. 945-957 ◽  
Author(s):  
Liuchong Wang ◽  
Wang Ping ◽  
Caiyou Zhao ◽  
Dongya Liu ◽  
Wenhua Ke
Keyword(s):  
Structural Characteristics ◽  
Great Influence ◽  
Urban Rail Transit ◽  
Control Measures ◽  
Rail Transit ◽  
Vibration Source ◽  
Vibration Level ◽  
Tunnel Wall ◽  
Time Frequency ◽  
Urban Rail

Due to the structural characteristics of railway turnouts, as well as their vulnerability to damage and other problems, the environmental vibrations induced by urban rail transit often have a greater effect on the railway turnouts than that on an ordinary line. Therefore, it is necessary to carry out an in-depth study on the characteristics of vibration source on the turnouts. In this paper, a group of representative turnouts is selected for field testing on four typical lines of different operational times in a Chinese city. The profile and rail irregularity of the turnouts are measured to evaluate the service condition of the turnouts and the wheel–rail interaction. The vibration acceleration of the track structure and tunnel wall is measured as the train passes the turnout by setting the measuring points in the two main vibration sources, including the switch and the crossing section. The time–frequency domain analysis method is used to analyze these data. It is found that the source strength of the tunnel wall in the crossing section is much greater than that in the switch section, and that the lateral vibration level is often greater than the vertical vibration level. Unexpectedly, there is a low positive correlation between the vibration level and the train speed, while the healthy state of the turnout rails has a great influence on the vibration level. According to the results of the research, the sources of vibration excitation in the turnouts are complex; therefore, it is necessary to comprehensively evaluate their environmental impact and take corresponding vibration control measures.

scholarly journals Stackelberg Game-Based Radio Resource Management Algorithm in an Urban Rail Transit Communication System

2021 ◽  
Author(s):  
Yingxia Shao ◽  
Hailin Jiang ◽  
Hongli Zhao
Keyword(s):  
Resource Management ◽  
Stackelberg Game ◽  
Radio Resource Management ◽  
Urban Rail Transit ◽  
Rail Transit ◽  
Radio Resource ◽  
Time Frequency ◽  
Management Algorithm ◽  
Urban Rail ◽  
Communication Modes

AbstractTrain-to-wayside (T2W) and train-to-train (T2T) communication modes may coexist in future train-centric communication-based train control (CBTC) systems. The feasibility of T2T communication in urban rail transit is analyzed first. Referring to the device-to-device (D2D) communication scenario in the general cellular network, this paper establishes a radio resource optimization model for the coexistence of train-to-train communication and train-to-wayside communication. With the aim of more efficient scheduling of radio time-frequency resources in the dedicated frequency band, we propose a Stackelberg game-based radio resource management algorithm based on the consideration of different service priorities of trains. The analysis and simulation results show that the proposed algorithm can effectively guarantee the performance of the system and improve the reliability of the CBTC system.

Collaborative passenger flow control of urban rail transit network considering balanced distribution of passengers

2021 ◽  
pp. 2150461
Author(s):  
Xiang Li ◽  
Yan Bai ◽  
Kaixiong Su
Keyword(s):  
Flow Control ◽  
Programming Model ◽  
Flow Characteristics ◽  
Service Level ◽  
Urban Traffic ◽  
Urban Rail Transit ◽  
Control Measures ◽  
Rail Transit ◽  
Passenger Flow ◽  
Urban Rail

The increase of urban traffic demands has directly affected some large cities that are now dealing with more serious urban rail transit congestion. In order to ensure the travel efficiency of passengers and improve the service level of urban rail transit, we proposed a multi-line collaborative passenger flow control model for urban rail transit networks. The model constructed here is based on passenger flow characteristics and congestion propagation rules. Considering the passenger demand constraints, as well as section transport and station capacity constraints, a linear programming model is established with the aim of minimizing total delayed time of passengers and minimizing control intensities at each station. The network constructed by Line 2, Line 6 and Line 8 of the Beijing metro is the study case used in this research to analyze control stations, control durations and control intensities. The results show that the number of delayed passengers is significantly reduced and the average flow control ratio is relatively balanced at each station, which indicates that the model can effectively relieve congestion and provide quantitative references for urban rail transit operators to come up with new and more effective passenger flow control measures.

Determine the Radiation Zone of Urban Rail Transit Stations

2014 ◽  
Vol 556-562 ◽  
pp. 799-802
Author(s):  
Luan Ying Sun ◽  
Xiang Jun Zhang ◽  
Bo Yu
Keyword(s):  
Great Influence ◽  
Radial Distance ◽  
Urban Rail Transit ◽  
Impact Factors ◽  
Rail Transit ◽  
Surrounding Environment ◽  
Urban Rail ◽  
Radiation Zone ◽  
The Impact ◽  
Radiation Area

Taking urban rail transit stations’ passenger direct attracting scope as the research object, selecting three types of station in Nanjing Metro Line 1 to field survey respectively from traveler's basic information, traveler’s travel conditions and site surrounding environment to find out the impact factors having great difference among the sites and having great influence as independent variables, radial distance of urban rail transit station’s walking radiation area as dependent variable, establishing a linear equation used to determining the scope of radiation. This formula applied to determine the site practical walking radiation range has reference significance and certain rationality.

Simulation and Analysis for Environment Vibration Induced by Urban Rail Transit with Ground Line

2012 ◽  
Vol 226-228 ◽  
pp. 411-416
Author(s):  
He Nian Zhang ◽  
Qi Yun Sun ◽  
Guang Jun Sun
Keyword(s):  
Three Dimensional ◽  
Measurement Data ◽  
Exciting Force ◽  
Urban Rail Transit ◽  
Propagation Path ◽  
Rail Transit ◽  
Vibration Source ◽  
Finite Element Software ◽  
Urban Rail ◽  
Ground Line

The environment vibration induced by urban rail transit becomes one of the severe environmental hazards and attracted great attention for researcher at home and abroad. Firstly，on the basis of track irregularity theory, an exciting force function of vibration source induced by ground line train is established. Then, the exciting force acts on the three-dimensional models of rail bearing structure and soil propagation path by utilizing the finite element software. The surrounding environment vibration response caused by train operation is simulated and the numerical results are compared and verified by the field measurement data. Furthermore, the parameter effects of train speed and properties of site soil on environment vibration are studied. The researches show that the numerical simulation in the paper can truly reflect the actual environment vibration caused by urban rail transit with ground line.

Analysis of Excavation Monitoring for the Fu-Qing Road Station in Ningbo Urban Rail Transit

2011 ◽  
Vol 255-260 ◽  
pp. 4034-4038
Author(s):  
Rong Hua Ye ◽  
Gan Bin Liu ◽  
Jun Neng Ye
Keyword(s):  
Soft Clay ◽  
Urban Rail Transit ◽  
Control Measures ◽  
Rail Transit ◽  
Geological Condition ◽  
Engineering Geological Condition ◽  
Foundation Pit ◽  
Urban Rail ◽  
Information Construction ◽  
Construction Supervision

The foundation pit of Fuqing road station is the first one to be excavated in Ningbo urban rail transit project. To ensure the safety of the foundation pit, a detailed monitoring scheme is established according to the engineering geological condition and design scheme of foundation pit. Due to Ningbo city is located in the classical soft clay area, there may occur pre-warning and dangerous condition during the excavation. Therefore, reinforcement of structure and soil is executed from the aspects of designing, construction, supervision and monitoring. At last, the deformation of foundation pit is controlled and the construction safety is ascertained. Furthermore, the information construction is adopted during the excavation and many data are obtained during the process of monitoring, the displacement of diaphragm wall, ground settlement and axial force of the support are analyzed. In addition, the control measures are presented and can provide reference to the future construction of the other stations.

scholarly journals Risk Identification and Prevention and Control Measures of Urban Rail Transit Construction

2020 ◽  
Vol 6 (1) ◽  
pp. 9
Author(s):  
Zhongda Wang
Keyword(s):  
Negative Impact ◽  
Risk Identification ◽  
Urban Rail Transit ◽  
Control Measures ◽  
Future Research ◽  
Rail Transit ◽  
The Sustainable Development ◽  
Urban Rail ◽  
Prevention And Control Measures ◽  
And Control

<p>Urban rail transit is a key bridge to promote the sustainable development of national economy. The risk problems existing in the actual construction process will have a negative impact on the rail transit to play its own role, and it is closely related to the stable development of the country and society. Based on this, this paper probes into the risk identification of urban rail transit engineering construction in order to provide corresponding reference for future research.</p>

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