ISO/TS 13471-2:2022
(Main)Acoustics — Temperature influence on tyre/road noise measurement — Part 2: Correction for temperature when testing with the pass-by methods
Acoustics — Temperature influence on tyre/road noise measurement — Part 2: Correction for temperature when testing with the pass-by methods
This document specifies correction procedures for the effect of temperature on vehicle noise emission, as influenced by the tyre/road noise contribution. Temperatures considered are road and ambient air temperatures. The noise emission for which this document is applicable is measured by means of ISO 11819-1, or similar methods such as the American methods SIP and CTIM specified in References [3][4]. It is also applicable to other pass-by measurements conducted without acceleration, such as when testing tyres and vehicles on test tracks with ISO 10844[1] reference surfaces; however, given that tyre/road noise is dominant. 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.
Acoustique — Effet de la température sur les essais de bruit pneu/route — Partie 2: Correction de la température lors des essais utilisant les méthodes au passage
General Information
Standards Content (Sample)
TECHNICAL ISO/TS
SPECIFICATION 13471-2
First edition
2022-08
Acoustics — Temperature influence on
tyre/road noise measurement —
Part 2:
Correction for temperature when
testing with the pass-by methods
Acoustique — Effet de la température sur les essais de bruit pneu/
route —
Partie 2: Correction de la température lors des essais utilisant les
méthodes au passage
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Acoustics . 1
3.2 Measured noise quantities . 2
3.3 Tyre and vehicle classes . 2
3.4 Road surface . 3
3.5 Temperatures. 3
4 Principles of the correction procedures . 4
5 Temperature measurement equipment . 5
6 Measurement methods . 5
6.1 General . 5
6.2 Measurement of air temperature . 5
6.3 Measurement of road surface temperature (optional) . 6
6.4 Measurement of tyre temperature (optional) . 6
7 Temperature range . 6
7.1 General . 6
7.2 Temperature range within which the correction procedure is valid . 6
8 Temperature correction procedure . 6
8.1 Correction to noise levels . 6
8.2 Temperature coefficient . 7
8.3 Spectral correction . 8
9 Compensation for the effect of power unit noise . 9
10 Measurement uncertainty assessment according to ISO/IEC Guide 98-3 .9
10.1 General . 9
10.2 Potential uncertainties . . 10
10.3 Uncertainty estimation of temperature correction . 10
10.4 Sources of uncertainty . 10
10.4.1 Temperature coefficients (γ ), δ . 10
t 1
10.4.2 Temperature measurements (T), δ . . 10
10.4.3 Road surface category (rs), δ . 11
10.4.4 Vehicle effect, δ . 11
10.4.5 Solar radiation and warming of tyres, δ . 11
10.4.6 Tyre effect, δ . 11
10.5 Estimation of uncertainties . 11
11 Test report .12
Annex A (informative) Information about road surface types .13
Annex B (informative) Selection of temperature for normalization .15
Bibliography .17
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
A list of all parts in the ISO/TS 13471 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
Air, tyre and road surface temperatures affect noise emission from the tyre/road interaction, as
measured by means of, for example, the statistical pass-by (SPB) method specified in ISO 11819-1
or other pass-by methods. These methods allow the user to make measurements within a wide air
temperature range (5 °C to 35 °C) which means that temperature influence on the results may be
substantial.
Another common type of measurement where temperature effects on tyre/road noise are significant
is for noise tests on tyres most commonly conducted as pass-by on test tracks with a reference surface
[1]
according to ISO 10844 . This case is also considered in this document, with the aim to reduce the
uncertainties in such measurements. These are often made for legal purposes, such as type approval
or labelling of tyres or vehicles where tyres are the dominant noise source. This is further dealt with in
Annex A.
Temperature effects on noise depend on both the tyre and the road surface, the temperatures of
which are affected by ambient air temperature. The temperature has different effects on different
noise generation mechanisms and when also considering the effect of possible power unit noise mixed
with tyre/road noise, the temperature effect becomes even more complicated. Ideally, and whenever
possible, temperature corrections shall be tailored to not only the tested tyre/road combination as well
as to different tyre and vehicle categories, but also to the type of measurement method. For example,
[2]
there is also a Technical Specification related to the CPX method (ISO/TS 13471-1 ).
The approach to the temperature correction in this document is semi-generic, which means that under
certain conditions a correction to noise for temperature is made common to a group of vehicles and
tyres or a group of road surfaces as it is impossible to do it for each tyre and road surface combination.
This document makes a distinction to cars and heavy vehicles and to a few major road pavement
categories, and also takes into account local, regional or national conditions.
v
TECHNICAL SPECIFICATION ISO/TS 13471-2:2022(E)
Acoustics — Temperature influence on tyre/road noise
measurement —
Part 2:
Correction for temperature when testing with the pass-by
methods
1 Scope
This document specifies correction procedures for the effect of temperature on vehicle noise emission,
as influenced by the tyre/road noise contribution. Temperatures considered are road and ambient air
temperatures.
The noise emission for which this document is applicable is measured by means of ISO 11819-1, or
similar methods such as the American methods SIP and CTIM specified in References [3][4]. It is also
applicable to other pass-by measurements conducted without acceleration, such as when testing tyres
[1]
and vehicles on test tracks with ISO 10844 reference surfaces; however, given that tyre/road noise is
dominant.
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of t
...
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