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EN 16272-4:2016

Current
Current

The latest, up-to-date edition.

Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction under direct sound field
Published date

28-09-2016

European foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Sound diffraction index difference measurements
6 Measurement uncertainty
7 Measuring procedure
8 Test report
Annex A (informative) - Indoor measurements for
        product qualification
Annex B (informative) - Measurement uncertainty
Bibliography

This European Standard describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of railway noise barriers. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a noise barrier with and without the added device installed on its top. The intrinsic effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height. In other words, the method described here gives the acoustic benefit of changing the shape and materials of the top edge over a simple barrier of the same height. This is an intrinsic characteristic of the added device, provided that the source and receiver positions are standardized. In practice, when the added device is placed over an existing barrier, it raises the height and this provides additional screening, depending on the source and receiver positions, not considered in this European Standard.The test method is intended for the following applications:-preliminary qualification, outdoors or indoors, of added devices to be installed on noise barriers;-determination of sound diffraction index difference of added devices in actual use;-comparison of design specifications of an added device with actual performance data after the completion of the construction work;-verification of the long term performance of added devices (with a repeated application of the method);-interactive design process of new products, including the formulation of installation manuals.The test method can be applied both in situ and on samples purposely built to be tested using the method described here.Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in the restricted frequency range and the reasons for the restriction(s) shall be clearly reported. A single-number rating is calculated from frequency data.For indoor measurements, see Annex A.

Committee
CEN/TC 256
DevelopmentNote
To be read in conjunction with EN 16272-3-2 & EN 16272-6. Supersedes PREN 16272-4. (10/2016)
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

EN 16272-3-2:2014 Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 3-2: Normalized railway noise spectrum and single number ratings for direct field applications
ISO 13472-1:2002 Acoustics Measurement of sound absorption properties of road surfaces in situ Part 1: Extended surface method
ISO 354:2003 Acoustics — Measurement of sound absorption in a reverberation room
CEN/TS 1793-4 : 2003 ROAD TRAFFIC NOISE REDUCING DEVICES - TEST METHOD FOR DETERMINING THE ACOUSTIC PERFORMANCE - PART 4: INTRINSIC CHARACTERISTICS - IN SITU VALUES OF SOUND DIFFRACTION
IEC 60942:2003 Electroacoustics - Sound calibrators
EN 16272-6:2014 Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 6: Intrinsic characteristics - In situ values of airborne sound insulation under direct sound field conditions
EN ISO 354:2003 Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
EN 61672-1:2013 Electroacoustics - Sound level meters - Part 1: Specifications
IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters
ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)

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