ISO/TS 13471-1:2017
Acoustics — Temperature influence on tyre/road noise measurement — Part 1: Correction for temperature when testing with the CPX method
ISO/TS 13471-1:2017 specifies procedures for determining the effect of temperature on tyre/road noise emission. Temperatures considered are tyre, road and ambient air temperatures.
The noise emission for which this document is applicable is measured by means of ISO 11819‑2, or similar methods such as the on-board sound intensity (OBSI) method specified in Reference [1]. Measurement results obtained at a certain temperature, which may vary over a wide range, are normalized to a designated reference temperature (20 °C) using a correction procedure specified in this document.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 Acoustics
3.2 Tyres and road surfaces
3.3 Temperatures
4 Principles of the correction procedures
5 Temperature measurement equipment
6 Measurement methods
6.1 General
6.2 Measurement of air temperature
6.3 Measurement of road surface temperature (optional)
6.4 Measurement of tyre temperature (optional)
7 Temperature range
7.1 General
7.2 Temperature range within which the correction procedure is valid
8 Temperature correction procedure
8.1 Correction to CPX levels, LCPX
8.2 Temperature coefficient
8.3 Spectral correction
9 Measurement uncertainty assessment according to ISO/IEC Guide 98-3
9.1 General
9.2 Potential uncertainties
9.3 Uncertainty estimation of temperature correction
9.4 Sources of uncertainty
9.4.1 Temperature coefficients, γt
9.4.2 Road surface category, δ
9.4.3 Temperature measurements, T
9.5 Estimation of uncertainties
10 Test report
Annex A (informative) Discrete temperature coefficient
Annex B (informative) Information about road surface types
Annex C (informative) Selection of temperature for normalization
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 Acoustics
3.2 Tyres and road surfaces
3.3 Temperatures
4 Principles of the correction procedures
5 Temperature measurement equipment
6 Measurement methods
6.1 General
6.2 Measurement of air temperature
6.3 Measurement of road surface temperature (optional)
6.4 Measurement of tyre temperature (optional)
7 Temperature range
7.1 General
7.2 Temperature range within which the correction procedure is valid
8 Temperature correction procedure
8.1 Correction to CPX levels, LCPX
8.2 Temperature coefficient
8.3 Spectral correction
9 Measurement uncertainty assessment according to ISO/IEC Guide 98-3
9.1 General
9.2 Potential uncertainties
9.3 Uncertainty estimation of temperature correction
9.4 Sources of uncertainty
9.4.1 Temperature coefficients, γt
9.4.2 Road surface category, δ
9.4.3 Temperature measurements, T
9.5 Estimation of uncertainties
10 Test report
Annex A (informative) Discrete temperature coefficient
Annex B (informative) Information about road surface types
Annex C (informative) Selection of temperature for normalization
Bibliography