Track-Based Control Measures for Ground Vibration – The Influence of Quasi-Static Loads and Dynamic Excitation
Notes on Numerical Fluid Mechanics and Multidisciplinary Design(2012)
摘要
Ground vibration from surface trains is induced by two main excitation mechanisms, due to the moving quasi-static loads and dynamic loads due to track roughness. The relative importance of these two mechanisms has been investigated using a semi-analytical model of the coupled vehicle, track and ground system. The track is represented as an infinite, layered beam resting on one or more elastic soil layers, overlying a three-dimensional half-space of ground material. The train is modelled as a multi-body system with both primary and secondary suspensions and its motion is included. The quasi-static and dynamic loads have been investigated over a wide range of conditions for locations close to the track and further away. Results are shown in terms of insertion gains for both dynamic and quasi-static components for a wide variety of conditions. It is confirmed that an assessment of the effect of a change in support stiffness should not be based on measurements too close to the track in the case considered the distance should be at least 10 m to give representative results.
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关键词
Soft Clay, Ground Vibration, Train Speed, Velocity Level, Dynamic Excitation
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