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BS ISO 13472-1:2022 – TC

BS ISO 13472-1:2022 – TC

$217.84

Tracked Changes. Acoustics. Measurement of sound absorption properties of road surfaces in situ – Extended surface method

Published By Publication Date Number of Pages
BSI 2022 100
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PDF Catalog

PDF Pages PDF Title
64 National foreword
68 Foreword
69 Introduction
71 1 Scope
2 Normative references
3 Terms and definitions
73 4 Summary of the method
4.1 General principle
74 4.2 Signal separation technique
75 4.3 Test method
76 5 Test system
5.1 Components of the test system
5.2 Sound source
5.3 Test signal
6 Data processing
6.1 Calibration
77 6.2 Sampling frequency
6.3 Temporal separation of the signals
78 7 Positioning of the equipment
7.1 Maximum sampled area
7.2 Positioning of the measuring equipment
79 7.3 Reflecting objects
7.4 Background noise
7.5 Safety considerations
80 8 Road surface and meteorological conditions
8.1 Condition of the road surface
8.2 Wind
81 8.3 Temperature
9 Measurement procedure
10 Measurement uncertainty
83 11 Test report
85 Annex A (normative) Radius of the maximum sampled area
86 Annex B (normative) Reference measurement and correction procedure
87 Annex C (informative) Physical principle of the measurement
89 Annex D (informative) Example of a test report
93 Annex E (informative) Sound absorption coefficient at non-normal incidence
95 Annex F (normative) Correction of small time shifts in the direct impulse response between the free-field measurement and the reflected measurement
99 Bibliography

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BS ISO 13472-1:2022 - TC
$217.84