ISO/TS 11819-3:2021
Acoustics — Measurement of the influence of road surfaces on traffic noise — Part 3: Reference tyres
This document specifies two tyres intended to serve as reference tyres when using the close-proximity (CPX) method specified in ISO 11819-2.
The CPX method is a method for evaluating different road surfaces with respect to their influence on traffic noise, under conditions when tyre/road noise dominates. This method ideally requires the use of standardized tyres, which have noise characteristics that are broadly representative of the effect of road surfaces on the noise emission of passenger car and heavy vehicle tyres. However, such tyres are not specified in ISO 11819-2. This document serves to specify these standardized tyres.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General principles
5 Reference tyres
5.1 Tyres description
5.2 Tyre specifications
5.3 Tread pattern
5.4 Tread pattern condition
5.5 Rubber hardness
6 Test wheel and tyre mounting
7 Tyre run-in
8 Tyre load and inflation
9 Correction for the influence of rubber hardness on CPX levels
9.1 General
9.2 Correction to CPX levels
9.3 Rubber hardness coefficient
10 Correction for the influence of temperature on CPX levels
11 Measurement uncertainty assessment according to ISO/IEC Guide 98-3
12 Documentation
Annex A (normative) Measurement of rubber hardness
Annex B (informative) Storage and preservation of tyres
Annex C (informative) Availability of the reference tyres
Annex D (informative) Selection of test tyres (market versus reference tyres)
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General principles
5 Reference tyres
5.1 Tyres description
5.2 Tyre specifications
5.3 Tread pattern
5.4 Tread pattern condition
5.5 Rubber hardness
6 Test wheel and tyre mounting
7 Tyre run-in
8 Tyre load and inflation
9 Correction for the influence of rubber hardness on CPX levels
9.1 General
9.2 Correction to CPX levels
9.3 Rubber hardness coefficient
10 Correction for the influence of temperature on CPX levels
11 Measurement uncertainty assessment according to ISO/IEC Guide 98-3
12 Documentation
Annex A (normative) Measurement of rubber hardness
Annex B (informative) Storage and preservation of tyres
Annex C (informative) Availability of the reference tyres
Annex D (informative) Selection of test tyres (market versus reference tyres)
Bibliography