A Suggestion of Blasting Patterns of a Mine closed to Railway Line for Securing Safety of High Speed Train

To investigate the dynamic transfer characteristics of low geosynthetic-reinforced embankments supported by CFG piles under high-speed train load, a numerical study has been conducted through dynamic finite element method on basis of the dynamic field test on a cross-section of Beijing-Shanghai high-speed railway. The comparative analysis on results of numerical study and field test indicated the distribution characteristics of vertical dynamic stress induced by high-speed train load in subgrade soil under railway line. The numerical results also suggested a high stress area in subgrade where vertical dynamic stress is over 1kPa. Conclusions of this work can provide reference for both design and estimation of long-term settlement of low geosynthetic-reinforced embankments supported by CFG piles for high-speed railway.

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Anti-snow performance of snow shields designed for brake calipers of a high-speed train

Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit ◽

10.1177/0954409718783327 ◽

2018 ◽

Vol 233 (2) ◽

pp. 121-140 ◽

Cited By ~ 2

Author(s):

Jiabin Wang ◽

Guangjun Gao ◽

Yan Zhang ◽

Kan He ◽

Jie Zhang

Keyword(s):

High Speed ◽

Snow Accumulation ◽

Cold Weather ◽

High Speed Train ◽

Detached Eddy Simulation ◽

Discrete Phase Model ◽

Railway Line ◽

Eddy Simulation ◽

Flow Features ◽

Discrete Phase

When high-speed trains run on a snowy railway line in cold weather, a large amount of snow and ice will accumulate on the brake calipers, which can lead to huge safety problems. In this paper, to solve this issue, a numerical method based on the detached eddy simulation was used to explore the flow features of a high-speed train running in cold weather. The accuracy of mesh resolution and methodology of Computational Fluid Dynamics (CFD) was validated against the wind tunnel tests. A discrete phase model was used to investigate the process of snow accumulation on the brake calipers by analysing the movement characteristics of snow particles. Based on this analysis, three kinds of anti-snow packing shields for the brake calipers were designed, and the shielding effects were compared via numerical simulations. The results show that a large amount of snow particles below the bogie directly impact the brake calipers causing massive snow packing on the bottom surfaces; some snow particles reflected from the rear equipment cabin cover return to the bogie region and accumulates on the upper surfaces. With the application of anti-snow packing shields with trapezoidal-, triangular- and cambered-shaped openings, the rates of snow accumulation on the brake calipers were reduced by 18.53, 26.68 and 38.81%, respectively. The cambered type provides the best anti-snow packing performance for the brake calipers.

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Application of Fuzzy Analytic Hierarchy Process for Evaluation of Ankara-Izmir High-Speed Train Project

AI-Based Services for Smart Cities and Urban Infrastructure - Advances in Computational Intelligence and Robotics ◽

10.4018/978-1-7998-5024-3.ch012 ◽

2021 ◽

pp. 258-276

Author(s):

Ömer Faruk Efe

Keyword(s):

Decision Making ◽

Population Structure ◽

High Speed ◽

Evaluation Criteria ◽

Transportation Systems ◽

High Speed Train ◽

Social Situations ◽

Analytic Hierarchy ◽

Railway Line ◽

Hierarchy Process

In Turkey, where important projects are materialized in transportation and logistics field, different alternatives are developed for transportation systems. Among these, high-speed train (HST) systems are the most popular transportation types. HST is preferred for many economic, technological, ecological, and social situations. In this chapter, it is made the evaluation of the Ankara-İzmir HST line. The fuzzy analytical hierarchy process (FAHP), which is one of the multi-criteria decision-making (MCDM) techniques, is used in the evaluation. Fuzzy logic contributes to decision making using linguistic variables in uncertain environment. This chapter takes into consideration in the realization of the HST project some criteria such as the places in the railway line, the population structure of the cities, accessibility, and accession to significant logistical points. As a result, “population structure” criterion among the evaluation criteria was found to have more importance.

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Real-Time Energy-Saving Optimization for Multiple Trains Based on Multiagent Cooperative Control

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/2607-12 ◽

2017 ◽

Vol 2607 (1) ◽

pp. 93-102

Author(s):

Rui-Fen Zhang ◽

Wei ShangGuan ◽

Bai-Gen Cai ◽

Jian Wang ◽

Wei Jiang ◽

...

Keyword(s):

Energy Saving ◽

Real Time ◽

Cooperative Control ◽

High Speed ◽

Optimization Problem ◽

Operation Strategy ◽

High Speed Train ◽

Railway Line ◽

Train Control ◽

Train Operation

Nowadays, the energy-saving optimization problem has gradually become a hot spot in the subject of high-speed train control. Traditional static train trajectory planning is designed offline according to a preplanned timetable, but ignored are the uncertainties of parameters because of line conditions and other factors in the process of operation. Thus, the previous operation strategy may not suit the remaining section. The cooperative control strategy for multiple trains was investigated with the aim of conserving energy between successive stations under the constraints of safety and punctuality. First, combined with the train operation strategy under the quasi-moving block system of the Chinese Train Control System, a train cooperative interaction mechanism based on multiagent input is proposed to obtain the real-time running characteristics of trains on the railway via the Radio Block Center (RBC) agent. In the case of unanticipated events of railway line conditions, train operation is often out of accord with the timetable. Therefore, a resilience set related to trip-time deviation and headway variation is introduced to evaluate the robustness of the railway system and achieve balance in the train group. Also, a multigroup parallel differential evolution algorithm is developed to solve the online optimization problem of a high-speed train group according to real-time information. The proposed approach is analyzed by using operational data from the Wuhan–Changsha highspeed railway line in China to assess energy savings and punctuality. Results of the case study show superior performance and effectiveness of the model, and the methodology is illustrated.

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Integrated Overnight Train Scheduling and Maintenance Planning for High-Speed Railway Lines

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198120968830 ◽

2020 ◽

pp. 036119812096883

Author(s):

Dian Wang ◽

Shuguang Zhan ◽

Qiyuan Peng ◽

Wentao Zhou

Keyword(s):

High Speed ◽

Programming Model ◽

Mixed Integer ◽

Maintenance Planning ◽

High Speed Train ◽

High Speed Railway ◽

Train Scheduling ◽

Railway Line ◽

High Speed Trains ◽

Commercial Solver

Overnight high-speed trains are very popular and convenient for passengers in countries with a large territory like China. However, the overnight high-speed train operation inevitably conflicts with the regular evening maintenance. We focus on both overnight high-speed train scheduling and maintenance planning to eliminate the conflict. Because some of the daytime high-speed trains that run early in the morning or late in the evening also interact with overnight high-speed trains and maintenance, we also allow them to be to slightly rescheduled to improve both the quality of the overnight train timetable and the maintenance plan. Our integrated optimization problem is formulated as a mixed integer linear programming model, which can be solved efficiently by the commercial solver CPLEX. Finally, we validate our model on a large real-world case constructed based on the Beijing–Guangzhou high-speed railway line in China.

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Single Opening Tunnel Hood Parameter Sensitive Research

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.1759 ◽

2013 ◽

Vol 353-356 ◽

pp. 1759-1765

Author(s):

Ying Xue Wang ◽

Bo Gao ◽

Yu Min Wen ◽

Lun Gui Li

Keyword(s):

Pressure Wave ◽

High Speed ◽

Simulation Method ◽

High Speed Train ◽

Railway Tunnel ◽

High Speed Railway ◽

Railway Line ◽

Opening Ratio ◽

Single Opening ◽

Tunnel Entrance

when high-speed train passing through tunnel, the micro-pressure wave noise will be created at tunnel exit, which worsening the living environmental condition along the railway line. Building hood at tunnel entrance is an effective method for solving this problem. In this paper, using numeral simulation method, the efficiency of single opening tunnel hood relieving micro-pressure wave noise was researched, the sensitive of hood opening parameter, such as opening ratio, ratio of length and width, was analyzed. In the end, the tunnel hood optimizing parameters was drawn out, which will play an important guiding role for high-speed railway tunnel hood design.

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