A 3D finite element modeling of hammer test for track parameter identification

A 3D finite element modeling of hammer test for track parameter identification

Oregui, M.
Li, Z.
Dollevoet, R.P.B.J.
Moraal, J.

Civil Engineering and Geosciences

Structural Engineering

2011-06-20

In railway tracks, short wave rail surface defects give rise to high wheel-rail dynamic forces and noise. Having a better insight into short wave defect occurrence could lead to development of adapted maintenance methods or track design to delay or avoid defect, so that the high short wave defect related maintenance costs may be reduced. As part of a health monitoring method under development, obtaining track dynamic characteristics is the first step in assessing track deterioration. In-situ hammer test measurements are widely used for track parameter derivation. In this paper, in order to reproduce hammer test measurements so that track parameters can be identified, a Finite Element model was developed where the rail and the sleeper were modeled with their real geometry. Although some discrepancy still exists between the first and second order pin-pin anti-resonances and the measured frequencies, the model showed the same main track characteristics in the receptance function as the measurements. The reacceptance function in the frequency range 1500-3000 Hz was also qualitatively determined. The model could not yet simulate the frequency response between 450-1000 Hz for tracks with monoblock and timber sleepers as modal analysis of the sleeper corroborated. Future work is focused on improving the model so that it is valid for the complete frequency range of 450-3000 Hz and tracks of all the sleepers type.

hammer test
track vertical dynamics
FE model
parameter identification

http://resolver.tudelft.nl/uuid:97ea4579-edb9-41e9-96eb-153eec7d6691

ICEDyn 2011: Proceedings of the International Conference on Structural Engineering Dynamics, Tavira, Portugal, 20-22 June 2011

Institutional Repository

conference paper

(c) 2011 The Author(s)