BS ISO 13472-2:2010

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test equipment
6 Measurement and analysis procedure
7 Positioning of the equipment
8 Measurement and analysis procedure
9 Measurement uncertainty
10 Test report
Annex A (normative) - Correction on base of reference
        measurement
Annex B (informative) - Measurement uncertainty
Annex C (informative) - Sketch of in-situ test fixture
Annex D (informative) - Example of a test report
Bibliography

Defines a test method for measuring in situ the sound absorption coefficient of road surfaces for the one-third-octave-band frequencies ranging from 250 Hz to 1600 Hz under normal incidence conditions.

This part of ISO13472 specifies a test method for measuring in situ the sound absorption coefficient of road surfaces for the one-third-octave-band frequencies ranging from 250Hz to 1600Hz under normal incidence conditions. For special purposes, the frequency range can be changed by modifying the dimensions of the system. The test method is intended for: determination of the sound absorption coefficient of semi-dense to dense road surfaces (and, if of interest, also the complex acoustical impedance); determination of the sound absorption properties of test tracks in accordance with standards such as ISO10844 and test surfaces defined in national and international type approval regulations for road vehicles and vehicle tyres; verification of the compliance of the sound absorption coefficient of a road surface with design specifications or other requirements.