scholarly journals Research on Identification and Suggested Control Value of Continuous Multi-Wave Track Alignment Irregularities in High-Speed Railway

2020 ◽  
Author(s):  
Fei Yang ◽  
Jialin Sun ◽  
Yu Zhang ◽  
Liandong Li ◽  
Yiyu Long
Keyword(s):  
High Speed ◽  
Amplitude Distribution ◽  
High Speed Railway ◽  
Control Value ◽  
Plate Deformation ◽  
Coupling Dynamic ◽  
Dynamic Detection ◽  
The Relationship ◽  
Train Vibration ◽  
Coupling Dynamic Model

Continuous multi-wave irregularity can easily lead to train vibration, which will influence the safety and comfort of vehicle. Due to the influence of bridge creep and track plate deformation, continuous multi-wave irregularity has appeared in high-speed railway lines, but the management value of continuous multi-wave irregularity is not given in the geometric dynamic detection standard of high-speed railway tracks in China at present. Therefore, it is necessary to continue to improve the standard. Based on the dynamic detection data of high-speed railway, the typical characteristics of continuous multi-wave track alignment irregularity are extracted, its automatic recognition model is established, and the amplitude distribution and variation trend of continuous multi-wave track alignment irregularity were statistically analyzed. The vehicle-track coupling dynamic model is established, and the relationship between continuous multi-wave track alignment irregularity and vehicle dynamic response is simulated and analyzed. The control limit of continuous multi-wave track alignment irregularity at different speed levels of high-speed railway in China are put forward.

Effects of High-Speed Railway in Tunnel on Vibration Response of Upper Building

2013 ◽  
Vol 482 ◽  
pp. 155-162
Author(s):  
Si Hui Xu ◽  
Xiao Hui Zhang ◽  
Han Chen
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Reaction Force ◽  
Element Model ◽  
Vibration Response ◽  
Vibration Level ◽  
High Speed Railway ◽  
Proper Distance ◽  
Coupling Dynamic ◽  
Coupling Dynamic Model

In order to study the effects of high-speed railway in tunnel on vibration response of upper building, the Vehicle-Track-Tunnel-Soil-Building coupling dynamic model was established, and the reaction force of fasteners was used to transmit between Vehicle-Track coupling dynamic model and Tunnel-Soil-Building finite element model. According to modal analysis for typical section of building, sensitive frequency range and sensitive structure locations were obtained. In terms of two conditions, Tunnel-Building Integrated Structure and building are evaded from tunnel for some distance, 1/3 octave vibration level and VLZ vibration acceleration level for all measuring points were calculated to analyze the vibration response of building. The results are shown as follows: for Tunnel-Building Integrated Structure, the overall vibration level is high,which is above 65dB. 2-3dB will be reduced by decreasing speed and improving standard of track. when building is evaded from tunnel for some distance, with larger evaded distance, the vibration response is slighter. However, when evaded distance is above 30m, vibration may be amplified ,so its necessary to select proper distance. Vibration response of structure is most strong when 4 lines meet under building, so strict limitation on meeting condition of trains can effectively reduce vibration level.

Mapping relationship between dynamic responses of high-speed trains and additional bridge deformations

2020 ◽  
pp. 107754632093689
Author(s):  
Hongye Gou ◽  
Chang Liu ◽  
Hui Hua ◽  
Yi Bao ◽  
Qianhui Pu
Keyword(s):  
High Speed ◽  
Coupled Model ◽  
Dynamic Responses ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Running Safety ◽  
High Speed Trains ◽  
Track Bridge ◽  
The Relationship ◽  
Track Deformation

Deformations of high-speed railways accumulate over time and affect the geometry of the track, thus affecting the running safety of trains. This article proposes a new method to map the relationship between dynamic responses of high-speed trains and additional bridge deformations. A train–track–bridge coupled model is established to determine relationship between the dynamic responses (e.g. accelerations and wheel–rail forces) of the high-speed trains and the track deformations caused by bridge pier settlement, girder end rotation, and girder camber. The dynamic responses are correlated with the track deformation. The mapping relationship between bridge deformations and running safety of trains is determined. To satisfy the requirements of safety and riding comfort, the suggested upper thresholds of pier settlement, girder end rotation, and girder camber are 22.6 mm, 0.92‰ rad, and 17.2 mm, respectively. This study provides a method that is convenient for engineers in evaluation and maintenance of high-speed railway bridges.

Micro-Simulation System on Passengers of the PDL Station Design

2011 ◽  
Vol 467-469 ◽  
pp. 493-496 ◽  
Author(s):  
Chun Xia Gao ◽  
Bao Tian Dong ◽  
Qian Li ◽  
Ai Li Wang
Keyword(s):  
High Speed ◽  
Simulation System ◽  
Railway Station ◽  
High Speed Railway ◽  
Micro Simulation ◽  
Output Module ◽  
The Relationship

The paper presents the context of the micro-simulation on passengers of high-speed railway station, designs the micro-simulation system, meanwhile, divides the system into four modules, they are: passengers setting module, station design module, passengers simulation module and results output module. The functions and detailed contents of the modules are described, at the same time, the models of each module involved are introduced, and the relationship between modules are represented.

Optimal Allocation of High-Speed Railway Mobile Equipment Based on the Passenger Flow

2014 ◽  
Vol 505-506 ◽  
pp. 471-476
Author(s):  
Qing Jie Zheng ◽  
Bao Ming Han ◽  
Hua Li
Keyword(s):  
High Speed ◽  
Optimal Allocation ◽  
Allocation Problem ◽  
Load Factor ◽  
Transport Capacity ◽  
High Speed Railway ◽  
Passenger Flow ◽  
The Relationship ◽  
Passenger Load Factor ◽  
Multiple Units

Based on the relationship between passenger flow and demand of electric multiple units (EMU), a new methodology to calculate the EMU demand and allocate the EMU is proposed, which can meet the demand of passenger as well as avoid the waste of transport capacity. An offline allocation plan of EMU is designed by analyzing the fluctuation in passenger flow, passenger average haul distance, passenger load factor and so on. Using the methodology, the EMU allocation problem is solved through program, which is used in Beijing-Shanghai High-speed Railway to obtain the EMU allocation plan.

Calculation of Carrying Capacity at High-Speed Railway Stations Based on Route Selection

2015 ◽  
Vol 744-746 ◽  
pp. 1786-1791
Author(s):  
Qian Rui Zhao ◽  
Qi Zhang ◽  
Pei Liu
Keyword(s):  
Carrying Capacity ◽  
High Speed ◽  
Operation Time ◽  
Route Selection ◽  
High Speed Railway ◽  
Railway Stations ◽  
Selection Scheme ◽  
Capacity Calculation ◽  
The Relationship

Carrying capacity calculation at high-speed railway stations is closely related to the trains with different types and arriving rules. Traditional method is not feasible to calculate and evaluate carrying capacity at high-speed railway stations efficiently and accurately. Therefore, a method to calculate carrying capacity at high-speed railway stations was presented by establishing a route selection optimization model and designing corresponding algorithm. In the method, the integration concept of calculating carrying capacity was introduced by establishing the relationship between receiving dispatching route and arrival-departure track. An approach was provided to the solution of route selection scheme and calculating carrying capacity at high-speed railway stations efficiently and accurately by considering the differences of trains with different operation modes and operation time. Case study of Jinan West railway station verifies the feasibility of the method. The presented method can provide a technical support for calculating and evaluating carrying capacity at high-speed railway stations in different scenarios.

Study on Calculation Method of Stresses under Embankment

2011 ◽  
Vol 90-93 ◽  
pp. 656-661
Author(s):  
Hong Bin Xiao ◽  
Yue Wang
Keyword(s):  
Calculation Method ◽  
High Speed ◽  
Influence Factors ◽  
Engineering Practice ◽  
Correction Coefficient ◽  
Calculation Methods ◽  
Uniform Load ◽  
High Speed Railway ◽  
Railway Engineering ◽  
The Relationship

In China high-speed railway engineering practice, embankment settlements calculated values were often greatly different to the measured values, which may result from the stresses distribution under the embankment usually simplified. According to this issue, the elastic embankment method was introduced, the stresses under various embankment were calculated, the influence factors of the stresses values and distribution were analyzed. The stresses calculated by elastic embankment method, proportional load form and uniform load form were compared with the measured stresses. The relationship among the four kinds of stresses was analyzed. The applicable conditions of the various calculation methods were put forward. If the ratio of embankment half surface width and height was less than 4.5, when the stresses calculated by uniform load form were multiplied by correction coefficient 1.15, they were tallied well with the measured stresses.

scholarly journals Measurement-Based Delay and Doppler Characterizations for High-Speed Railway Hilly Scenario

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yan Zhang ◽  
Zunwen He ◽  
Wancheng Zhang ◽  
Limin Xiao ◽  
Shidong Zhou
Keyword(s):  
High Speed ◽  
Delay Line ◽  
Doppler Frequency ◽  
Measured Data ◽  
Delay Spread ◽  
Propagation Characteristics ◽  
High Speed Railway ◽  
Channel Sounder ◽  
The Relationship ◽  
Frequency Features

This paper presents results for delay and Doppler spread characterization in high-speed railway (HSR) hilly scenario. To investigate the propagation characteristics in this specific terrain, a measurement campaign is conducted along the “Guangzhou-Shenzhen” HSR in China. A wideband channel sounder with 40 MHz bandwidth is used to collect raw data at 2.4 GHz band. The delay spread and Doppler frequency features are analyzed based on measured data. It is found that there are abundant multipath components (MPCs) in this scenario. We present the relationship between the delay spreads and the transceiver distances. The measured route can be divided into four areas with different delay and Doppler characteristics. Finally, a tapped delay line (TDL) model is proposed to parameterize the channel responses in the HSR hilly environment, which is supposed to provide criterions for evaluations of the radio interface and development of wireless communication system.

Relationship of Fractal Structure and Compactibility of Coarse Grain Soil in High Speed Railway Subgrade

2013 ◽  
Vol 438-439 ◽  
pp. 1108-1111 ◽  
Author(s):  
Ya Bing Huang ◽  
Yan Jun Li ◽  
Tan Jiao
Keyword(s):  
High Speed ◽  
Fractal Theory ◽  
Fractal Dimensions ◽  
Coarse Grained ◽  
Dry Density ◽  
Maximum Dry Density ◽  
High Speed Railway ◽  
Compaction Characteristics ◽  
Relationship Of ◽  
The Relationship

As an important factor that affects the compaction characteristics of the coarse grained fillers in the high speed railway subgrade, the grain composition is characterized by the application of the fractal theory. Several types of the coarse grained fillers were selected for testing and the results indicated that the relationship actually exists between the compaction characteristics and the fractal dimensions. The variation law of the maximum dry density fluctuating with the quality fractal dimension was analyzed and the results were supposed to estimate the compaction characteristics of the coarse grained fillers.

scholarly journals Assessing the Relationship between Access Travel Time Estimation and the Accessibility to High Speed Railway Station by Different Travel Modes

2020 ◽  
Vol 12 (18) ◽  
pp. 7827
Author(s):  
Yuyang Zhou ◽  
Minhe Zhao ◽  
Songtao Tang ◽  
William H. K. Lam ◽  
Anthony Chen ◽  
...  
Keyword(s):  
Travel Time ◽  
High Speed ◽  
Estimation Error ◽  
Time Budget ◽  
Time Estimation ◽  
Travel Time Estimation ◽  
Railway Station ◽  
High Speed Railway ◽  
Departure Time ◽  
The Relationship

This paper aims to fill the research gap of the relationship between the access travel time (ATT) estimation and the accessibility to high speed railway (HSR) station. A regression analysis was developed on the basis of risk-return model to analyze the access travel time estimation error (ATTEE). The data sources were 1595 valid interview survey data at Beijing South Railway Station (BSRS), China in October 2016. The factors and scenarios included travel mode, departure time, and travel date, etc. The coefficients of ATT estimation were obtained by different travel modes. The results showed that the expected access travel time (EATT) has positive linear correlation with the actual access travel time (AATT). Accessibility was calculated by the ratio of AATT to EATT. The accessibility coefficients ranged from 0.89 to 1.38 in different travel modes, departure time, and travel dates. A smaller coefficient indicates better travel time reliability and accessibility. This study not only provides a useful tool to estimate the travel time budget required for access to HSR station, but also establishes a connection with the accessibility and ATTEE. It offers an opportunity to estimate ATT to HSR stations by different modes of transport, which can help to better understand how the accessibility of the feeder transport changes at different time periods.

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