Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Measuring system requirements
5.1 General
5.2 Accuracy of the output signal
5.3 Dimensions of the probe
5.4 Tracking of the probe
5.5 Sampling interval
5.6 Record length
6 Data acquisition
6.1 General
6.2 Test section requirements
6.2.1 Track structure
6.2.2 Localized geometric features
6.3 Reference surface choice
6.4 Data sampling
6.4.1 General
6.4.2 Longitudinal sampling
6.4.3 Lateral sampling
6.5 Preparation of the rail head surface
6.6 Acoustic roughness acquisition
7 Data processing
7.1 Principle
7.2 Spike removal technique
7.3 Curvature processing
7.4 Spectral analysis
7.4.1 Method A: Fourier analysis
7.4.2 Method B: digital filtering
7.5 Procedure for extending the wavelength range
7.6 Averaging process
8 Acceptance criteria
9 Presentation of the data
10 Report
Annex A (informative) - Examples of rail defects
Annex B (informative) - Example of program code to
implement acoustic roughness processing
Annex C (normative) - Algorithm used to synthesize a
one-third octave band spectrum from a corresponding
narrow band spectrum
Annex ZA (informative) - Relationship between this European
Standard and the Essential Requirements of EU
Directive EU 2008/57/EC
Bibliography