Ground vibrations generated from trains
Ground vibrations generated from trains
A semi-analytical mathematical model has been developed for the prediction of ground vibrations generated by surface trains. This model incorporates the necessary components of the railway system. The vehicles, track and ground are described in a sufficiently detailed manner. The vehicles are described as multiple rigid body systems and only vertical dynamics is considered. The track is modelled as multiple beams supported by vertical springs with consistent mass. The ground is represented by horizontal layers on a homogeneous half-space or a rigid foundation. The governing equations of the vehicles are solved in the frequency domain and those of the track-ground system in the frequency-wavenumber domain. The Fast Fourier Transform technique is used to convert the responses of the track and the ground from the frequency-wavenumber domain into the frequency-space and time-space domains. This model uses the moving axle loads and/or the wheel/rail combined irregularities as its inputs. Outputs include the dynamic wheel-rail forces, the displacements and displacement spectra of the track and the ground. The model has been validated using measured data from three sites. These sites present different ground conditions (very soft, fairly soft and hard) and different train-traffic operations (high-speed passenger trains and low-speed freight trains of two-axle wagons). The effects of various parameters on the ground vibration have been investigated using this model, especially the layered structure of the ground, the mass of the ballast, the train speed and the frequency of excitation. A number of findings have been obtained and the roles are demonstrated of the two mechanisms, quasi-static and dynamic, at different frequencies and for train speeds below and above the lowest ground wave speed. The validation of the model suggests that it can be used as a tool for predicting ground vibration levels of new lines and for investigating the nature of vibration observed at particular sites and studying vibration reduction measures.
University of Southampton
Sheng, Xiaozhen
84cceba0-fd8e-47a3-bff9-5847e8935201
2001
Sheng, Xiaozhen
84cceba0-fd8e-47a3-bff9-5847e8935201
Sheng, Xiaozhen
(2001)
Ground vibrations generated from trains.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
A semi-analytical mathematical model has been developed for the prediction of ground vibrations generated by surface trains. This model incorporates the necessary components of the railway system. The vehicles, track and ground are described in a sufficiently detailed manner. The vehicles are described as multiple rigid body systems and only vertical dynamics is considered. The track is modelled as multiple beams supported by vertical springs with consistent mass. The ground is represented by horizontal layers on a homogeneous half-space or a rigid foundation. The governing equations of the vehicles are solved in the frequency domain and those of the track-ground system in the frequency-wavenumber domain. The Fast Fourier Transform technique is used to convert the responses of the track and the ground from the frequency-wavenumber domain into the frequency-space and time-space domains. This model uses the moving axle loads and/or the wheel/rail combined irregularities as its inputs. Outputs include the dynamic wheel-rail forces, the displacements and displacement spectra of the track and the ground. The model has been validated using measured data from three sites. These sites present different ground conditions (very soft, fairly soft and hard) and different train-traffic operations (high-speed passenger trains and low-speed freight trains of two-axle wagons). The effects of various parameters on the ground vibration have been investigated using this model, especially the layered structure of the ground, the mass of the ballast, the train speed and the frequency of excitation. A number of findings have been obtained and the roles are demonstrated of the two mechanisms, quasi-static and dynamic, at different frequencies and for train speeds below and above the lowest ground wave speed. The validation of the model suggests that it can be used as a tool for predicting ground vibration levels of new lines and for investigating the nature of vibration observed at particular sites and studying vibration reduction measures.
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Published date: 2001
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Local EPrints ID: 464595
URI: http://eprints.soton.ac.uk/id/eprint/464595
PURE UUID: 61bb88d1-1c6d-47b6-a744-05fe84d9527b
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Date deposited: 04 Jul 2022 23:49
Last modified: 16 Mar 2024 19:38
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Author:
Xiaozhen Sheng
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