Dynamic impact measurements on crossings, in free floating and in-situ conditions

Conference paper (2014)

Authors

M.A. Boogaard Railway Engineering - CEG
A.L. Schwab Dynamics of Micro and Nano Systems - Mechanical, Maritime and Materials Engineering , Biomechatronics & Human-Machine Control - Mechanical, Maritime and Materials Engineering
Z. Li Railway Engineering - CEG
Research Group
Railway Engineering (CEG) (TU Delft)
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Published Date

2014

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Railway Engineering

Abstract

As vibration based condition monitoring requires a good understanding of the dynamic behaviour of the structure, a good model is needed. At the TU Delft a train borne monitoring system is being developed which currently focusses on crossings. Crossings are prone to very fast degradation due to impact loading. In this paper a finite element model of a free floating frog is presented and validated up to a 100 Hz using dynamic impact measurements. The mode shapes of the free floating frog are then also compared to some preliminary results from an in-situ test. This comparison shows that the in-situ frequencies can be up to twice the free floating frequency.