Impact of heavy urban rail vehicles running over light rail turnouts

Abstract

One of the major concerns in the development of railway systems is to choose an optimized wheel and rail profile from a wide range of material and geometries. Although various investigations are conducted to improve the vehicle and rail behavior, there is less research on the wheel–rail interaction when a heavy vehicle passes through a light rail track. A numerical model of the train, track, and turnout is developed. The model is validated using the data obtained from field measurements conducted in the Iranian Metro network. The wheel–rail interaction is investigated by sensitivity analyses of the heavy vehicle and light track parameters including train speed, wheel profile, axle load, track gage, and curve radius. Results indicated that the derailment risk, wear rate, and wheel–rail stresses increased by up to 35%, 600%, and 120%, respectively, when a heavy vehicle passes through a light track. It was shown that consideration of specific arrangements allow better interaction between wheel and rail.

Investigation on the Settlement of High Rockfill Embankment Using Centrifuge Tests

“…However, the geotechnical centrifuge setup also included a model box, a system of data acquisition, and sensors. The type of measuring instrument has a great influence on the results of the laboratory and field test [25]. The sensors that can be used to measure embankment displacement include strain gages and LVDTs, which are used in displacement measurement with high-precision requirements [26,27].…”

Optimization research on arc height of running surface based on reducing partial wear of straddle-type monorail vehicle running wheel tire

“…Scholars have extensive research on the FEM in railway track such as, in order to attenuate the transmission of vibration energy of metro and derive a safe distance between building to the metro, a series of finite element models of the track and the surrounding media was developed, which considered the real train loading conditions as an input and was validated by comparisons of its results with those of a comprehensive field measurement. [23][24][25] In the research, the reinforced concrete rail beam is in contact with pneumatic rubber tires. During the contact between the running wheel and the rail beam, the deformation of the running wheel tire is much greater than that of the rail beam.…”