ISO 10844:2021
Acoustics — Specification of test tracks for measuring sound emitted by road vehicles and their tyres
This document specifies the essential characteristics of a test track surface intended to be used for measuring rolling sound emission of vehicles and their tyres.
The surface design given in this document
— produces consistent levels of tyre or road sound emission under a wide range of operating conditions including those appropriate to vehicle sound testing,
— minimizes inter-site variation,
— limits absorption of the vehicle sound sources, and
— is consistent with road-building practice.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements of the test track
4.1 Size and geometry
4.1.1 Size
4.1.2 Slope and step
4.2 Surface properties
4.2.1 Irregularity
4.2.2 Sound absorption
4.2.3 Texture
4.3 Material properties of the drive lane
4.4 Conformity tests
4.5 Break-in of the test track
4.6 Stability with time and maintenance
5 Measurement methods and data processing
5.1 Measurement points
5.1.1 Drive lane
5.1.2 Propagation area
5.2 Irregularity measurement method
5.3 Texture measurement methods
5.3.1 Texture profile measurement and MPD calculations
5.3.2 Texture skewness and shape factor (g-factor) calculations (optional)
5.3.3 Texture spectrum calculations (optional)
5.4 Sound absorption measurement method
5.5 Slope and step measurement methods
5.5.1 Gradient measurement
5.5.2 Cross fall measurement
5.5.3 Step measurement
5.6 Aggregate grading measurement method
5.7 Bitumen modification elastic material measurement method
5.8 Surface course thickness measurement method
6 Conformity report
7 Summary of improvements on the 2014 edition
Annex A (informative) Maintenance and stability of acoustic performance of test surface over time
Annex B (informative) Method of calculation of shape factor (g-factor)
Annex C (informative) Improvements to this version compared to ISO 10844:2014
Bibliography
Previous versions
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements of the test track
4.1 Size and geometry
4.1.1 Size
4.1.2 Slope and step
4.2 Surface properties
4.2.1 Irregularity
4.2.2 Sound absorption
4.2.3 Texture
4.3 Material properties of the drive lane
4.4 Conformity tests
4.5 Break-in of the test track
4.6 Stability with time and maintenance
5 Measurement methods and data processing
5.1 Measurement points
5.1.1 Drive lane
5.1.2 Propagation area
5.2 Irregularity measurement method
5.3 Texture measurement methods
5.3.1 Texture profile measurement and MPD calculations
5.3.2 Texture skewness and shape factor (g-factor) calculations (optional)
5.3.3 Texture spectrum calculations (optional)
5.4 Sound absorption measurement method
5.5 Slope and step measurement methods
5.5.1 Gradient measurement
5.5.2 Cross fall measurement
5.5.3 Step measurement
5.6 Aggregate grading measurement method
5.7 Bitumen modification elastic material measurement method
5.8 Surface course thickness measurement method
6 Conformity report
7 Summary of improvements on the 2014 edition
Annex A (informative) Maintenance and stability of acoustic performance of test surface over time
Annex B (informative) Method of calculation of shape factor (g-factor)
Annex C (informative) Improvements to this version compared to ISO 10844:2014
Bibliography