Verification of Running Safety Evaluation Method for High-speed Railway

To adapt to the rapid growth of the logistics market and further improve the competitiveness of railway transportation, the high-speed freight train with a design speed of 350 km/h is being developed in China. The safety of the train under great axle load of 17 t and dynamic load is unknown. This paper is aimed to study the running safety of the high-speed freight train coupled with various cargo loading conditions negotiating a sharp curve at high velocity. A numerical model integrated a fluid-structure coupled container model and the nonlinear high-speed freight train was set up by the software of LS-DYNA. The fluid-structure interaction model between the container and fluid cargo was established using the Arbitrary Lagrangian-Eulerian (ALE) method. Two influencing parameters, including the cargo state in the container and the fill level, were selected. The study results showed that the wheelset unloading ratio and overturning coefficient could be significantly affected by the liquid sloshing, while the influence of sloshing on the risk of derailment was slight. In general, increasing the cargo filling rate would contribute to vehicle operation safety. In conclusion, this study would provide theoretical help for the running safety of the newly designed high-speed freight train.

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Seismic optimization of high-speed railway bridges considering the running safety of trains in normal service

Structure and Infrastructure Engineering ◽

10.1080/15732479.2021.2023587 ◽

2022 ◽

pp. 1-16

Author(s):

Qiong Gao ◽

Menggang Yang ◽

Dongliang Meng

Keyword(s):

High Speed ◽

High Speed Railway ◽

Railway Bridges ◽

Running Safety

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Improvement and In-Situ Application of an Evaluation Method of Ballasted-Track Condition Using Digital 2-D Image Analysis

Applied Sciences ◽

10.3390/app10217946 ◽

2020 ◽

Vol 10 (21) ◽

pp. 7946

Author(s):

Bongsik Park ◽

Yeong-Tae Choi ◽

Hyunmin Kim

Keyword(s):

Image Analysis ◽

High Speed ◽

Evaluation Method ◽

Recognition Rate ◽

High Speed Railway ◽

Analysis Methods ◽

Track Condition ◽

Ballasted Track ◽

Track Irregularity

The advancement in digital image analysis methods has led to the development of various techniques, i.e., quantification of ballast gravel abrasion. In this study, the recognition rate of gravel aggregates has been significantly increased by improving the image analysis methods. The correlation between the track quality index (TQI), which is the standard deviation of vertical track irregularity and represents the condition of a high-speed railway, and the number of maintenance works was analyzed by performing an image analysis on the samples collected from various locations of a high-speed railway. The results revealed that roundness has the highest correlation with the TQI, whereas sphericity has the highest correlation with the number of maintenance works. The ballast replacement would be performed to improve maintenance efficiency if the abrasion of the ballast aggregates becomes approximately 10%.

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

Journal of Vibration and Control ◽

10.1177/1077546320936899 ◽

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.

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High Speed Railway Environment Safety Evaluation Based on Measurement Attribute Recognition Model

Computational Intelligence and Neuroscience ◽

10.1155/2014/470758 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

Qizhou Hu ◽

Ningbo Gao ◽

Bing Zhang

Keyword(s):

Mahalanobis Distance ◽

High Speed ◽

Safety Evaluation ◽

Evaluation Index System ◽

Multidimensional Space ◽

Safety Level ◽

High Speed Railway ◽

Attribute Recognition ◽

Railway Operation ◽

The Impact

In order to rationally evaluate the high speed railway operation safety level, the environmental safety evaluation index system of high speed railway should be well established by means of analyzing the impact mechanism of severe weather such as raining, thundering, lightning, earthquake, winding, and snowing. In addition to that, the attribute recognition will be identified to determine the similarity between samples and their corresponding attribute classes on the multidimensional space, which is on the basis of the Mahalanobis distance measurement function in terms of Mahalanobis distance with the characteristics of noncorrelation and nondimensionless influence. On top of the assumption, the high speed railway of China environment safety situation will be well elaborated by the suggested methods. The results from the detailed analysis show that the evaluation is basically matched up with the actual situation and could lay a scientific foundation for the high speed railway operation safety.

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Project of High-Speed Railway and Sustainable Development Evaluating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.213.216 ◽

2011 ◽

Vol 213 ◽

pp. 216-220

Author(s):

Lin Liu ◽

Wei Liu

Keyword(s):

Sustainable Development ◽

High Speed ◽

Evaluation Method ◽

Evaluation Framework ◽

High Speed Railway ◽

The Sustainable Development ◽

Advantages And Disadvantages ◽

Business In China ◽

Construction Operation ◽

Evaluating Method

This paper presents an evaluating method to optimize the sustainable development of high-speed railway (HSR). HSR is a quickly expanding business in China and without exception it has both advantages and disadvantages. There are many factors, such as planning, design, construction, operation, consumer utilities, public participation, environmental protection, economic analysis, influencing the sustainable development of HSR. Aiming at the main factors influencing it, a series of indices are picked up and the evaluating method is established which is based on the grey relational analysis (GRA). By using this index, the closest to the best sustainable development state is selected in similarity HSRs. The result shows that the evaluation method based on GRA is simple and scientific and has a potential prospect. The major contribution of this research lies in developing a formal evaluation framework for the sustainable development of HSR and providing useful managerial insights.

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