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PD CEN/TR 16891:2016

Current
Current

The latest, up-to-date edition.

Railway applications. Acoustics. Measurement method for combined roughness, track decay rates and transfer functions
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

30-06-2016

This method is used to determine combined wheel-rail roughness and track decay rates from rail vibration during the pass-by of a train. By combining sound pressure measurement from the same pass-by, a vibro-acoustic transfer function for rolling noise is determined. The track decay rate is a vibration quantity that characterizes the attenuation of rail vibration along the track for a given wheel/rail contact excitation, and thereby affects the amount of sound radiation from the track. Combined roughness is a quantity that determines the level of excitation of wheel-rail rolling noise. It can be determined from vertical rail vibration during a train pass-by and the vertical track decay rate. The transfer function can be used to characterize the vibro-acoustic behaviour of the vehicle-track system for a given roughness excitation and in relation to rolling noise. Combined roughness, track decay rates and transfer functions are determined as one-third octave spectra. The method can be used for the following purposes: to measure track decay rates under operational conditions; to characterize the effectiveness of noise control measures in terms of combined roughness, transfer function and track decay rate; to compare the combined roughness before and after noise control measures are implemented (thereby quantifying the effect of any change in wheel or rail roughness); to monitor wheel roughness during a pass-by, either of whole trains or parts of trains; — to separate rolling noise from other sources; to assess a threshold for the rail roughness by measuring multiple pass-bys. The method is not for approval of sections of reference track in terms of acoustic rail roughness and track decay rates, which are covered by EN15610 and EN15461 , respectively. The method is applicable to trains on conventional tracks, i.e. normal ballasted tracks with wooden or concrete sleepers and on ballastless track systems. The method has not yet been validated for: non-standard wheel types such as small wheels up to 600mm diameter, resilient tram wheels; non-standard track types such as embedded rail or grooved rail; The method is not applicable to track with rail joints.

Committee
EH/1/2
DocumentType
Standard
Pages
0
PublisherName
British Standards Institution
Status
Current

Standards Relationship
CEN/TR 16891:2016 Identical

EN 15461:2008+A1:2010 Railway applications - Noise emission - Characterisation of the dynamic properties of track sections for pass by noise measurements
ISO 266:1997 Acoustics — Preferred frequencies
EN 61260-1:2014 Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
EN ISO 3095:2013 Acoustics - Railway applications - Measurement of noise emitted by railbound vehicles (ISO 3095:2013)
EN 15610:2009 Railway applications - Noise emission - Rail roughness measurement related to noise generation
IEC 61260-1:2014 Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
ISO 3095:2013 Acoustics Railway applications Measurement of noise emitted by railbound vehicles
ISO 5348:1998 Mechanical vibration and shock Mechanical mounting of accelerometers
EN ISO 266 : 1997 ACOUSTICS - PREFERRED FREQUENCIES (ISO 266:1997)

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