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

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

Determination of the optimal span length to minimize resonance effects in bridges on high-speed lines

2014 ◽  
Vol 230 (2) ◽  
pp. 335-344 ◽  
Author(s):  
Jeong-Rae Cho ◽  
Kilje Jung ◽  
Keunhee Cho ◽  
Jong-Won Kwark ◽  
Young Jin Kim ◽  
...  
Keyword(s):  
High Speed ◽  
Span Length ◽  
Resonance Effects ◽  
Optimal Span

scholarly journals Determination of Necessary Subsidiary Track According to Train Operation Frequency in a Heterogeneous Train Pattern

2020 ◽  
Vol 10 (12) ◽  
pp. 4164
Author(s):  
Hyoung June Kim
Keyword(s):  
Genetic Algorithm ◽  
Waiting Time ◽  
High Speed ◽  
The Third ◽  
Railway Construction ◽  
Different Types ◽  
High Speed Trains ◽  
Train Operation ◽  
Operation Frequency

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.

scholarly journals Effect of High-Speed Train-Induced Wind on Trackside UAV Thrust Near Railway Bridge

2020 ◽  
Vol 10 (10) ◽  
pp. 3495 ◽  
Author(s):  
Hyuk-Jin Yoon ◽  
Su-Hwan Yun ◽  
Dae-Hyun Kim ◽  
Jae Hee Kim ◽  
Bong-Kwan Cho ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Wind Velocity ◽  
High Speed ◽  
Railway Bridge ◽  
High Speed Train ◽  
Box Girder ◽  
Railway Bridges ◽  
High Speed Trains ◽  
Thrust Measurement ◽  
Girder Bridge

Imaging devices attached to unmanned aerial vehicles (UAVs) are used for crack measurements of railway bridges constructed for high-speed trains. This research aims to investigate track-side wind induced by high-speed trains and its effect on UAV thrust near the railway bridge. Furthermore, the characteristics of train-induced wind in three axial directions along a track, wind velocity, and the effect of train-induced wind on the UAV thrust were analyzed. This was achieved by installing 3-axis ultrasonic anemometers and a UAV thrust measurement system on top of a PSC box girder bridge. The changes in the train-induced wind velocity were monitored along the train travel, width, and height directions. The train-induced wind was measured at distances of 0.8, 1.3, 2.3, and 2.8 m away from the train’s body to analyze wind velocity based on distance. It was found that the maximum wind velocity decreased linearly as the distance from the train’s body increased. The UAV thrust increased by up to 20% and 60%, owing to train-induced wind when the leading and trailing power cars of a high-speed train passed, respectively. Thus, it is necessary to conduct further research to develop robust control and a variable pitch-propeller that can control thrust.

scholarly journals Ground-Based Radar Interferometry for Monitoring the Dynamic Performance of a Multitrack Steel Truss High-Speed Railway Bridge

2020 ◽  
Vol 12 (16) ◽  
pp. 2594
Author(s):  
Qihuan Huang ◽  
Yian Wang ◽  
Guido Luzi ◽  
Michele Crosetto ◽  
Oriol Monserrat ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Point Clouds ◽  
Vibration Monitoring ◽  
Dynamic Monitoring ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Testing Procedures ◽  
Microwave Radar ◽  
High Speed Trains

With the continuous expansion of the high-speed railway network in China, long-span railway bridges carrying multiple tracks demand reliable and fast testing procedures and techniques. Bridge dynamic behavior analysis is a critical process in ensuring safe operation of structures. In this study, we present some experimental results of the vibration monitoring of a four-track high-speed railway bridge with a metro–track on each side: the Nanjing–Dashengguan high-speed railway bridge (NDHRB). The results were obtained using a terrestrial microwave radar interferometer named IBIS-S. The radar measurements were interpreted with the support of lidar point clouds. The results of the bridge dynamic response under different loading conditions, including high-speed trains, metro and wind were compared with the existing bridge structure health monitoring (SHM) system, underlining the high spatial (0.5 m) and temporal resolutions (50 Hz–200 Hz) of this technique for railway bridge dynamic monitoring. The detailed results can help engineers capturing the maximum train-induced bridge displacement. The bridge was also monitored by the radar from a lateral position with respect to the bridge longitudinal direction. This allowed us to have a more exhaustive description of the bridge dynamic behavior. The different effects induced by the passage of trains through different tracks and directions were distinguished. In addition, the space deformation map of the wide bridge deck under the eccentric load of trains, especially along the lateral direction (30 m), can help evaluating the running stability of high-speed trains.

scholarly journals Optimal span length in high-speed transmission systems with hybrid Raman–erbium-doped fiber amplification

2005 ◽  
Vol 30 (1) ◽  
pp. 23 ◽  
Author(s):  
Juan Diego Ania-Castañón ◽  
Irina O. Nasieva ◽  
Sergei K. Turitsyn ◽  
Nicolas Brochier ◽  
Erwan Pincemin
Keyword(s):  
High Speed ◽  
Span Length ◽  
Transmission Systems ◽  
Erbium Doped ◽  
Optimal Span

scholarly journals Measurements of the Vertical Displacements of a Railway Bridge Using TLS Technology in the Context of the Upgrade of the Polish Railway Transport

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4275 ◽  
Author(s):  
Pelagia Gawronek ◽  
Maria Makuch ◽  
Bartosz Mitka ◽  
Tadeusz Gargula
Keyword(s):  
High Speed ◽  
New Technologies ◽  
Measurement Techniques ◽  
Vertical Displacement ◽  
Structure Stability ◽  
Steel Bridge ◽  
Railway Bridge ◽  
Land Surveying ◽  
High Speed Trains ◽  
Railway System

The railway system in Poland is undergoing technological transformation. The development of the Polish railway system concerns not only high-speed trains but also infrastructure. The steel bridge is the most popular type of railway bridge in Poland. Most of them were built in the 1950s and 1960s. According to the recommendations in place in Western Europe, such railway bridges should be reviewed in terms of their fitness for use with modern high-speed trains. The modern technological revolution affects not only the railway, but also developments in displacement and deformation measurement techniques. New technologies provide more objective measurement results and accelerate results processing. They also facilitate the non-contact measurement of bridge structure stability. The authors investigated the vertical displacement of an old steel railway bridge in three different, specific case studies of terrestrial laser scanning data application. Then, the results of 3D data were compared with traditional land surveying results. The scientific results led to a conclusion that a strictly determined methodology of the measurement and analysis of a terrestrial laser scanner results supported by traditional land surveying techniques facilitates the determination of the vertical displacement of bridges with acceptable accuracy.

Dynamic Interactions Between Long, High Speed Trains of Air Cushion Vehicles and Their Guideways

1971 ◽  
Vol 93 (1) ◽  
pp. 16-24 ◽  
Author(s):  
James F. Wilson ◽  
Sherrill B. Biggers
Keyword(s):  
High Speed ◽  
Span Length ◽  
Static Deflection ◽  
Dynamic Interactions ◽  
Suspension Systems ◽  
Passenger Safety ◽  
High Speed Trains ◽  
Air Cushion ◽  
Vertical Accelerations ◽  
Air Cushion Vehicles

Trains of high speed air cushion vehicles traversing simple spans are modeled as uniform pressure segments traveling at arbitrary speeds over identical Bernoulli-Euler beams. Series solutions are found for the transient span and vehicle responses where the trains overlap several spans at a time. Elastic foundation, span tension, and span damping effects are included. Conclusions reached after studying some realistic numerical examples for constant-speed trains on elevated spans are: (a) for trains which are longer than one span length, the dynamic deflection factors (maximum ratios of dynamic to static deflection at midspan) approach 2.0 at speeds between 300 and 600 mph, and occur as the end of the train approaches, midspan; (b) these dynamic deflections may be reduced by the addition of damping, by a reduction of span length, by the addition of span tension, and by an increase in span stiffness; (c) the high vertical accelerations of the vehicles, which may approach 2 g’s at speeds of 300 mph, show the need for advanced suspension systems to insure passenger safety and comfort.

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