Sources of variability in metro train-induced vibration
Sources of variability in metro train-induced vibration
In previous in-situ measurements of metro trains it has been found that the velocity level on the track or tunnel wall may vary significantly between different train passages, even though the measuring section, the type of trains and the track and tunnel conditions are identical. An investigation is carried out into the sources of this variability, using a 3D train-track numerical model. This is built using the software SIMPACK and ABAQUS, and is connected through one-way coupling to a finite element model of the tunnel and soil. These models are used to study the influence of various train parameters, including the wheel and rail unevenness, train speed and degree of train loading. For comparison, in-situ measurements were made of the dynamic response of the rail and tunnel wall. The rail roughness at the site as well as the wheel unevenness of all 48 wheels for one train were measured. The results from the model indicate that the wheel unevenness affects the rail velocity level in the frequency region between 25 and 250 Hz and tunnel wall vibration above 5 Hz. The rail velocity level can vary by up to 20 dB due to wheel unevenness, with the largest variations occurring in the frequency bands 50–63 Hz. Variations in passenger loading affect the train-induced vibration by up to 4.5 dB, mainly in the low frequency region. When the train speed varies within a range of ±20% relative to the nominal speed 60 km/h, the frequencies of the peaks are shifted and the level in some frequency bands can change by as much as 10 dB. However, the largest influence is that of the wheel unevenness. It is concluded that the variation in these parameters, especially the wheel and rail unevenness, should be considered to achieve reliable predictions of train-induced vibration.
Qu, Xiangyu
98e0143d-b717-4388-a573-293e66c2f2dc
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Ma, Meng
674282d9-695d-453a-800e-395f35cac980
Li, Minghang
7d2b7c9f-d1ef-4083-b4e5-b75e15da9102
Ntotsios, Evangelos
877c3350-0497-4471-aa97-c101df72e05e
10 August 2022
Qu, Xiangyu
98e0143d-b717-4388-a573-293e66c2f2dc
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Ma, Meng
674282d9-695d-453a-800e-395f35cac980
Li, Minghang
7d2b7c9f-d1ef-4083-b4e5-b75e15da9102
Ntotsios, Evangelos
877c3350-0497-4471-aa97-c101df72e05e
Qu, Xiangyu, Thompson, David, Ma, Meng, Li, Minghang and Ntotsios, Evangelos
(2022)
Sources of variability in metro train-induced vibration.
Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit.
(doi:10.1177/09544097221118).
Abstract
In previous in-situ measurements of metro trains it has been found that the velocity level on the track or tunnel wall may vary significantly between different train passages, even though the measuring section, the type of trains and the track and tunnel conditions are identical. An investigation is carried out into the sources of this variability, using a 3D train-track numerical model. This is built using the software SIMPACK and ABAQUS, and is connected through one-way coupling to a finite element model of the tunnel and soil. These models are used to study the influence of various train parameters, including the wheel and rail unevenness, train speed and degree of train loading. For comparison, in-situ measurements were made of the dynamic response of the rail and tunnel wall. The rail roughness at the site as well as the wheel unevenness of all 48 wheels for one train were measured. The results from the model indicate that the wheel unevenness affects the rail velocity level in the frequency region between 25 and 250 Hz and tunnel wall vibration above 5 Hz. The rail velocity level can vary by up to 20 dB due to wheel unevenness, with the largest variations occurring in the frequency bands 50–63 Hz. Variations in passenger loading affect the train-induced vibration by up to 4.5 dB, mainly in the low frequency region. When the train speed varies within a range of ±20% relative to the nominal speed 60 km/h, the frequencies of the peaks are shifted and the level in some frequency bands can change by as much as 10 dB. However, the largest influence is that of the wheel unevenness. It is concluded that the variation in these parameters, especially the wheel and rail unevenness, should be considered to achieve reliable predictions of train-induced vibration.
Text
Sources of variability in Metro Train induced Vibration-final
- Accepted Manuscript
More information
Accepted/In Press date: 20 July 2022
e-pub ahead of print date: 10 August 2022
Published date: 10 August 2022
Identifiers
Local EPrints ID: 469708
URI: http://eprints.soton.ac.uk/id/eprint/469708
ISSN: 0954-4097
PURE UUID: 5d3e6fdb-59e3-45a9-8d33-1a93e7f0f986
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Date deposited: 22 Sep 2022 16:46
Last modified: 17 Mar 2024 04:04
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Author:
Meng Ma
Author:
Minghang Li
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