EN 15461:2008+A1:2010

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Principles
6 Data acquisition
7 Data processing
8 Acceptance criteria
9 Test report
Annex A (informative) - Calculation of the decay rates
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 2008/57/EC of the European Parliament
         and of the Council of 17 June 2008 on the
         interoperability of the rail system within the
         Community (Recast)
Bibliography

This European Standard specifies a method for characterizing the dynamic behaviour of the structure of a track relative to its contribution to the sound radiation associated with the rolling noise.This European Standard describes a method for:a)acquiring data on mechanical frequency response functions on a track;b)processing measurement data in order to calculate an estimate of the vibration decay rates along the rails in an audible frequency range associated with the rolling noise;c)presenting this estimate for comparison with the lower limits of the decay rates.It is applicable for evaluating the performance of sections of reference tracks for measuring railway vehicle noise within the framework of official approval tests.The method is not applicable for characterizing the vibration behaviour of tracks on loadbearing structures such as bridges or embankments.