ISO 13472-1:2022
Acoustics — Measurement of sound absorption properties of road surfaces in situ — Part 1: Extended surface method
This document describes a test method for measuring in situ the sound absorption coefficient of road surfaces as a function of frequency in the range from 250 Hz to 4 kHz.
Normal incidence is assumed. However, the test method can be applied at oblique incidence although with some limitations (see Annex F). The test method is intended for the following applications:
— determination of the sound absorption properties of road surfaces in actual use;
— comparison of sound absorption design specifications of road surfaces with actual performance data of the surface after completion of the construction work.
The complex reflection factor can also be determined by this method.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Summary of the method
4.1 General principle
4.2 Signal separation technique
4.3 Test method
5 Test system
5.1 Components of the test system
5.2 Sound source
5.3 Test signal
6 Data processing
6.1 Calibration
6.2 Sampling frequency
6.3 Temporal separation of the signals
7 Positioning of the equipment
7.1 Maximum sampled area
7.2 Positioning of the measuring equipment
7.3 Reflecting objects
7.4 Background noise
7.5 Safety considerations
8 Road surface and meteorological conditions
8.1 Condition of the road surface
8.2 Wind
8.3 Temperature
9 Measurement procedure
10 Measurement uncertainty
11 Test report
Annex A (normative) Radius of the maximum sampled area
Annex B (normative) Reference measurement and correction procedure
Annex C (informative) Physical principle of the measurement
Annex D (informative) Example of a test report
Annex E (informative) Sound absorption coefficient at non-normal incidence
Annex F (normative) Correction of small time shifts in the direct impulse response between the free-field measurement and the reflected measurement
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Summary of the method
4.1 General principle
4.2 Signal separation technique
4.3 Test method
5 Test system
5.1 Components of the test system
5.2 Sound source
5.3 Test signal
6 Data processing
6.1 Calibration
6.2 Sampling frequency
6.3 Temporal separation of the signals
7 Positioning of the equipment
7.1 Maximum sampled area
7.2 Positioning of the measuring equipment
7.3 Reflecting objects
7.4 Background noise
7.5 Safety considerations
8 Road surface and meteorological conditions
8.1 Condition of the road surface
8.2 Wind
8.3 Temperature
9 Measurement procedure
10 Measurement uncertainty
11 Test report
Annex A (normative) Radius of the maximum sampled area
Annex B (normative) Reference measurement and correction procedure
Annex C (informative) Physical principle of the measurement
Annex D (informative) Example of a test report
Annex E (informative) Sound absorption coefficient at non-normal incidence
Annex F (normative) Correction of small time shifts in the direct impulse response between the free-field measurement and the reflected measurement
Bibliography