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Keywords: wheel-rail contact, convolution method, concrete slab.

Summary

The experimental measurement of railway vibrations requires the use of a complex measurement procedure. The knowledge of the influence of railway elements in the generation and transmission of vibration when a train passes, is important during the design and implementation of new railway tracks, in order to assess the environmental impact and for selecting the most suitable type of track from the point of view of their antivibration characteristics.

For the foregoing reasons, a mathematical model has been developed, which predicts the normal force generated in the wheel-rail interaction contact area [1]. The model includes a characterization of the railway and its constitutive elements, the characteristics of the suspension of the coach, and the nonlinear Hertzian theory in order to study wheel-rail contact.

The level of the rail vibration is obtained by means of a convolution method with variable kernel [2,3]. The frequency response of the system is calculated for the frequency range between 10 and 400 Hz, suitable for low speeds of movement, used in the suburban railways.

In some metropolitan railways, sections have been installed on which the track is supported by an intermediate concrete slab. Any kind of track can be used on the slab. This paper evaluates the influence of the slab in the dynamic response of the track.

The modeling of the slab has been designed based on the structural and dimensional characteristics existing in Line 9 of the suburban network of Barcelona, in which there are sections with intermediate concrete slab, on which the rail is installed with DFF fixations without sleepers.

This work also describes a quantitative analysis to compare the behavior of different types of track, about the generation and transmission of vibrations to the base of the track, considering the influence of inertia, stiffness and damping characteristics of each type of track. The results obtained using the proposed mode, have been validated by experimental measurements carried out in different lines of the metropolitan railway of Barcelona for various types of track.

References

1: J. Otero, J. Martínez, M.A. De los Santos, S. Cardona, "Study of the vibrations generated by the passage of a train. A wheel-track system modelization", Proceedings of the Tenth International Research/Expert TMT 2006 Conference, Lloret de Mar, Barcelona, Spain, 1403-1406, 2006.
2: M.A. De los Santos, J. Martínez, S. Cardona, "A convolution application to determine the dynamic response of a railway track", Mechanical Systems and Signal Processing, 9(6), 707-708, 1995. doi:10.1006/mssp.1995.0053
3: J. Martínez, M.A. De los Santos, S. Cardona, "A convolution method to determine the dynamic response in a railway track submitted to a moving vertical excitation", Machine Vibration, 4, 142-146, 1995.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 96 PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping and Y. Tsompanakis Paper 19 Development of an Analytical Model to study Railway Track Dynamics for the calculation of Vibration Levels arising from the Passage of Rail Vehicles J. Otero Yugat, J. Martínez Miralles, M.A. de los Santos López and S. Cardona i Foix Department of Mechanical Engineering, Polytechnic University of Catalonia, Barcelona, Spain doi:10.4203/ccp.96.19 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Development of an Analytical Model to study Railway Track Dynamics for the calculation of Vibration Levels arising from the Passage of Rail Vehicles", in B.H.V. Topping, Y. Tsompanakis, (Editors), "Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 19, 2011. doi:10.4203/ccp.96.19 Keywords: wheel-rail contact, convolution method, concrete slab. Summary The experimental measurement of railway vibrations requires the use of a complex measurement procedure. The knowledge of the influence of railway elements in the generation and transmission of vibration when a train passes, is important during the design and implementation of new railway tracks, in order to assess the environmental impact and for selecting the most suitable type of track from the point of view of their antivibration characteristics. For the foregoing reasons, a mathematical model has been developed, which predicts the normal force generated in the wheel-rail interaction contact area [1]. The model includes a characterization of the railway and its constitutive elements, the characteristics of the suspension of the coach, and the nonlinear Hertzian theory in order to study wheel-rail contact. The level of the rail vibration is obtained by means of a convolution method with variable kernel [2,3]. The frequency response of the system is calculated for the frequency range between 10 and 400 Hz, suitable for low speeds of movement, used in the suburban railways. In some metropolitan railways, sections have been installed on which the track is supported by an intermediate concrete slab. Any kind of track can be used on the slab. This paper evaluates the influence of the slab in the dynamic response of the track. The modeling of the slab has been designed based on the structural and dimensional characteristics existing in Line 9 of the suburban network of Barcelona, in which there are sections with intermediate concrete slab, on which the rail is installed with DFF fixations without sleepers. This work also describes a quantitative analysis to compare the behavior of different types of track, about the generation and transmission of vibrations to the base of the track, considering the influence of inertia, stiffness and damping characteristics of each type of track. The results obtained using the proposed mode, have been validated by experimental measurements carried out in different lines of the metropolitan railway of Barcelona for various types of track. References 1 J. Otero, J. Martínez, M.A. De los Santos, S. Cardona, "Study of the vibrations generated by the passage of a train. A wheel-track system modelization", Proceedings of the Tenth International Research/Expert TMT 2006 Conference, Lloret de Mar, Barcelona, Spain, 1403-1406, 2006. 2 M.A. De los Santos, J. Martínez, S. Cardona, "A convolution application to determine the dynamic response of a railway track", Mechanical Systems and Signal Processing, 9(6), 707-708, 1995. doi:10.1006/mssp.1995.0053 3 J. Martínez, M.A. De los Santos, S. Cardona, "A convolution method to determine the dynamic response in a railway track submitted to a moving vertical excitation", Machine Vibration, 4, 142-146, 1995. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £130 +P&P)
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