Technical approach to the efficiency determination of high-speed trains

In this study, a genetic algorithm was used to calculate the scheduled waiting time according to the train operation frequency of heterogeneous trains operating on one track. The acquired data were then used to determine the appropriate subsidiary track at which high-speed trains can load or release cargo away from low-speed trains. A metaheuristic genetic algorithm was applied and implemented using Javascript/jQuery. Six cases were investigated, which provided values of subsidiary track that vary according to the operation frequencies of different types of trains, and solutions were derived through 100 simulations using a stochastic method. The analysis results showed that the train overtaking frequency was the highest at the third intermediate station within the simulation, suggesting that this particular station requires a subsidiary track, even if the operating frequency of each train differs across the entire track considered in this study. The results of this study are expected to facilitate objective and practical planning during railway construction.

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Determination of the optimal span length for a railway bridge crossed by various types of high-speed trains

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

10.1177/0954409714549083 ◽

2014 ◽

Vol 230 (2) ◽

pp. 531-543

Author(s):

Jeong-Rae Cho ◽

Kilje Jung ◽

Keunhee Cho ◽

Jong-Won Kwark ◽

Young Jin Kim ◽

...

Keyword(s):

High Speed ◽

Span Length ◽

Railway Bridge ◽

High Speed Trains ◽

Optimal Span

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High-Speed Quantum Efficiency Determination of Multijunction Solar Cells

IEEE Journal of Photovoltaics ◽

10.1109/jphotov.2017.2778043 ◽

2018 ◽

Vol 8 (1) ◽

pp. 333-341

Author(s):

Thomas Missbach ◽

Simon Andreas Dengler ◽

Gerald Siefer ◽

Andreas W. Bett

Keyword(s):

Solar Cells ◽

Quantum Efficiency ◽

High Speed ◽

Multijunction Solar Cells ◽

Efficiency Determination

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High-Speed Broadband Quantum Efficiency Determination of Solar Cells

IEEE Journal of Photovoltaics ◽

10.1109/jphotov.2017.2730885 ◽

2017 ◽

Vol 7 (5) ◽

pp. 1384-1389 ◽

Cited By ~ 1

Author(s):

Thomas Missbach ◽

Reinhold S. L. Straub ◽

Tobias M. Benkhoff ◽

Gerald Siefer

Keyword(s):

Solar Cells ◽

Quantum Efficiency ◽

High Speed ◽

Efficiency Determination

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Determination of the Minimum Departure Interval between Trains with same High-Speed at the Relatively Initial Station

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.587-589.1737 ◽

2014 ◽

Vol 587-589 ◽

pp. 1737-1740

Author(s):

Jing Jing Shao ◽

Lei Shan Zhou ◽

Zi Xi Bai ◽

Yong Feng Shang

Keyword(s):

High Speed ◽

Operational Efficiency ◽

High Density ◽

Sufficient Condition ◽

Necessary And Sufficient Condition ◽

Research Focus ◽

High Speed Railway ◽

High Speed Trains ◽

Necessary And Sufficient

Chinese high-speed railway is in a boom and making train diagram with high-density trains to relieve capacity intense and improve operational efficiency has become the research focus. Different kinds of station intervals between adjacent trains are the basis for the train diagram. According to the situation in which trains with different speed run on the same line and the proportion of high-speed trains is much larger than that of middle-speed trains, this paper raises principles and methods to determine the minimum departure interval between trains with same speed at the relatively initial station. The minimum departure interval between trains with same speed at the relatively initial station is a necessary and sufficient condition for making train diagram since there is no overtaking between same-speed trains.

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DETERMINATION OF DYNAMIC LOADS FROM THE WHEEL ON THE RAIL FOR HIGH-SPEED TRAINS

Science and Transport Progress Bulletin of Dnipropetrovsk National University of Railway Transport ◽

10.15802/stp2015/46069 ◽

2015 ◽

Vol 0 (3(57)) ◽

pp. 118-128 ◽

Cited By ~ 2

Author(s):

D. M. Kurhan

Keyword(s):

High Speed ◽

Dynamic Loads ◽

High Speed Trains

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Estimation of dynamic performances of the safe operation of high-speed electric train

Archives of Transport ◽

10.5604/01.3001.0009.7374 ◽

2017 ◽

Vol 41 (1) ◽

pp. 7-16 ◽

Cited By ~ 6

Author(s):

Rostyslav Domin ◽

Iurii Domin ◽

Ganna Cherniak

Keyword(s):

High Speed ◽

Rolling Stock ◽

Safe Operation ◽

Passenger Rail ◽

High Speed Trains ◽

Safety Parameters ◽

Dynamic Performances ◽

New Generation ◽

Electric Train

The process of implementation of new developments, in particular, new generation rolling stock holds a prominent place among the range of measures for organization of high-speed passenger rail transportation in Ukraine. The example of permission for use and the initial phase of work with interregional NRCS2 dual-mode electric trains produced by Hyundai-Rotem Corporation is the illustrative one in this context. Due to the detection of macro-cracks in bolster beams of the car body frames of these electric trains, namely in the areas of mounting of anti-yaw dampers, these trains were taken out of service until the completion of the modernization of problematic nodes. The comprehensive study on the determination of the safety parameters of electric trains was conducted to determine the causes of destruction of bolster beams. At the same time, bolster beams loading was estimated depending on the characteristics of anti-yaw dampers by means of computer simulation of the dynamics of motion of trailing and motor cars. The feasibility of selection of parameters for anti-yaw dampers mounted on electric train cars was assessed. The results of work will improve the safe operation of high-speed trains and increase the efficiency of estimates regarding the loading of bearing structures of underframes of the of rolling stock.

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Experimental Study on the Ballast Pick-Up Problem in High Speed Trains

2010 Joint Rail Conference, Volume 2 ◽

10.1115/jrc2010-36214 ◽

2010 ◽

Author(s):

Fermin Navarro-Medina ◽

Angel Sanz-Andres ◽

Isabel Perez-Grande

Keyword(s):

Theoretical Model ◽

High Speed ◽

Experimental Results ◽

Wind Gust ◽

Experimental Facility ◽

Proposed Model ◽

Theoretical Predictions ◽

High Speed Trains ◽

Train Speed

A new theoretical approach on the determination of the conditions for the initiation of the motion of the ballast stones due to the wind gust created under the high-speed trains has been recently developed (Sanz-Andres & Navarro-Medina, 2009). This determination is critical to predict the starting of ballast pick-up, because once the motion is initiated a saltation-like chain reaction could take place. Sometimes the flying stones reach an height which is larger than the lowest parts of the train, striking them (and the track surroundings) producing considerable damage that are to be avoided e.g. by limiting the maximum allowed operational train speed. The aim of this contribution is to present the experimental results that have been obtained to check the validity of the proposed model. The experimental facility is a wind tunnel, with a gust generator, with a maximum wind speed of some 20 m/s (65.6 ft/s) and 10 Hz gust frequency. The test section is 0.39 m × 0.54 m (15.4 in × 21.3 in), which is suitable to perform experiments with stone models. It is shown that in the range of parameters explored, the experimental results are in good agreement with the theoretical model predictions. In this contribution the theoretical model is summarized, the experimental facility is described, showing some of its typical performances, the experimental procedure is outlined, and the experimental results are compared with the theoretical predictions.

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