SIST EN ISO 11819-2:2017

SLOVENSKI STANDARD
oSIST prEN ISO 11819-2:2015
01-oktober-2015
Akustika - Merjenje vpliva cestnih površin na prometni hrup - 2. del: Metoda
merjenja v neposredni bližini (ISO/DIS 11819-2:2015)
Acoustics - Measurement of the influence of road surfaces on traffic noise - Part 2: The
close-proximity method (ISO/DIS 11819-2:2015)
Akustik - Messung des Einflusses von Straßenoberflächen auf Verkehrsgeräusche - Teil
1: Nahfeldmessmethode
Acoustique - Méthode de mesurage de l'influence des revêtements de chaussées sur le
bruit émis par la circulation - Partie 2: Méthode de proximité immédiate (ISO/DIS 11819-
2:2015)
Ta slovenski standard je istoveten z: prEN ISO 11819-2
ICS:
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
oSIST prEN ISO 11819-2:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 11819-2:2015

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oSIST prEN ISO 11819-2:2015
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11819-2.2
ISO/TC 43/SC 1 Secretariat: DIN
Voting begins on: Voting terminates on:
2015-10-01  2015-12-01
Acoustics — Measurement of the influence of road surfaces
on traffic noise —
Part 2:
The close-proximity method
Acoustique — Méthode de mesurage de l’influence des revêtements de chaussées sur le bruit émis par la
circulation —
Partie 2: Méthode de proximité immédiate
ICS: 17.140.30
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
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STANDARDS MAY ON OCCASION HAVE TO
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Reference number
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ISO/DIS 11819-2.2:2015(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2015

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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ii © ISO 2015 – All rights reserved

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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
Contents Page
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 Road and pavement related definitions . 2
3.2 Measurement methods and equipment. 3
3.3 Acoustic quantities and symbols . 3
3.4 Symbols used for correction terms . 4
4 Symbols and abbreviated terms . 5
5 Measurement principle . 6
6 Measuring instruments . 6
6.1 Sound level instrumentation . 6
6.2 Frequency analysis ins trum entati on . 7
6.3 Sound calibration instrumentation . 7
6.4 Verification of the sound measuring system . 7
6.5 Vehicle speed measuring instrumentation . 7
6.6 Position monitoring instrumentation . 7
6.7 Temperature measuring instrumentation . 7
6.8 Tyre load measuring equipment . 7
6.9 Inflation pressure measuring equipment . 8
7 Test sites . 8
8 Meteorological conditions . 8
8.1 Wind . 8
8.2 Temperature and other weather related issues . 9
9 Test vehicle . 9
9.1 General design . 9
9.2 Microphone positions and mounting . 10
9.3 Performance requirements and conformity of the test vehicle. 12
9.4 Reference tyres . 12
9.5 Tyre mounting . 13
9.6 Tyre run-in . 13
10 Measurement procedure . 13
10.1 Preparations for measurements . 13
10.2 Measurement of sound . 13
10.3 Procedure for study of typical road section . 13
10.4 Minimum number of runs for very short road sections . 14
10.5 Lateral position on the road . 14
10.6 Longitudinal position on the road . 14
10.7 Consideration of disturbing noise . 14
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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
10.8 Test vehicle speed . 15
10.9 Tyre loads . 15
10.10 Tyre inflation . 15
10.11 Temperature measurement . 15
11 Analysis procedure . 16
11.1 Definition of steps in the calculation process . 16
11.2 Results expressed as overall levels . 18
11.3 Results expressed as one-third-octave-band levels . 19
11.4 Correction for analysis of spectral levels . 20
11.5 Acoustic variability (optional) . 20
12 Measurement uncertainty assessment according to ISO/IEC Guide 98-3 . 20
13 Repeatability and reproducibility: System comparison according to ISO 5725 . 22
14 Test report . 23
Annex A (informative) Certification of the test vehicle . 26
Annex B (normative) Averaging within each road segment . 33
Annex C (normative) Detailed explanation of the calculation procedure . 35
Annex D (informative) Applicability of ISO 11819 methods . 40
Annex E (informative) Guidelines for design and use of the test vehicl e . 42
Annex F (informative)  Guidelines for measurements. 46
Annex G (informative) Application of the CPX method for surveying large road networks . 49
Annex H (informative) Application of the CPX method for other objectives . 52
Annex I (informative) Summary of measurement parameters . 54
Annex J (informative)  Validity and stability of the method . 55
Annex K (informative) Measurement uncertainty . 58
Annex L (informative) Reference road surface . 61
Annex M (informative) Calculation of close-proximity sound indices . 63
Annex N (informative) Summary of measuring and data-processing procedures . 64
Annex O (informative) Example of test report . 67
Bibliography . 70

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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
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 through ISO technical committees. Each member body interested in a subject for which a
technical committee has been established has the right to be represented on that committee.
International organizations, governmental and non-governmental, in liaison with ISO, also take part in
the work. 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, www.iso.org/directives.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received, www.iso.org/patents.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
The committee responsible for this document is ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
ISO 11819 consists of the following parts, under the general title Acoustics — Measurement of the
influence of road surfaces on traffic noise:
— Part 1: Statistical Pass-By method
— Part 2: The close-proximity method
— Part 4: SPB method using backing board [Publicly Available Specification]
The following part is under preparation:
— Part 3: Reference tyres [Technical Specification]
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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
Introduction
The emission and propagation of road traffic noise greatly depends on road surface characteristics,
notably on texture, flow resistivity, and acoustic absorption. All these characteristics influence the
generation of tyre/road noise and, in addition, the acoustic absorption can influence the propagation of
sound, particularly when the propagation takes place close to the surface. Power unit noise, which is
usually generated at a greater height above the road surface than tyre/road noise, may also be affected
during propagation by the porosity characteristics of the road surface. These effects lead to differences
in sound pressure levels, associated with a given traffic flow and composition, from different road
surfaces of up to 15 dB which can have a substantial impact on the environmental quality alongside a
road.
It is therefore important to be able to measure the influence of surface characteristics on tyre/road
noise by a standardized method. Within the constraints of this method, this International Standard
offers an objective rating of the road characteristics to satisfy a need expressed by road planners, road
administrators, contractors, manufacturers of so-called “low-noise surfaces”, and by other parties
concerned with the control of road traffic noise.
A method satisfying the needs expressed in the foregoing, but having serious practical constraints,
appears in ISO 11819-1. That method, called the statistical pass-by (SPB) method, is intended for use
essentially for two main purposes. It can be used: first, to classify surfaces in typical and good condition
as a type according to their influence on traffic noise (surface classification); and second, to evaluate the
influence on traffic noise of different surfaces at particular sites irrespective of condition and age.
However, due to severe requirements on the acoustical environment at the measurement site, the
method cannot generally be used for approval of new or rebuilt surfaces at any arbitrary location. In
addition, the SPB method has a number of other practical limitations, which are outlined in Annex D.
The method specified in this part of ISO 11819, together with the planned ISO/TS 11819-3 complement
the SPB method in applications where the latter has limitations.
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oSIST prEN ISO 11819-2:2015
DRAFT INTERNATIONAL STANDARD ISO/DIS 11819-2.2

Acoustics — Measurement of the influence of road surfaces on
traffic noise — Part 2: The close-proximity method
1 Scope
This part of ISO 11819 specifies a method of evaluating different road surfaces with respect to their
influence on traffic noise, under conditions when tyre/road noise dominates. The interpretation of the
results applies to free-flowing traffic travelling on essentially level roads at constant speeds of 40 km/h
and upwards, in which cases tyre/road noise is assumed to dominate (although in some countries it is
possible that tyre/road noise does not dominate at 40 km/h when the proportion of heavy vehicles is
high). For other driving conditions where traffic is not free-flowing, such as at junctions or under heavy
acceleration, and where the traffic is congested, the influence of the road surface on noise emission is
more complex; as is also the case for roads with high longitudinal gradients and a high proportion of
heavy vehicles.
A standard method for comparing noise characteristics of road surfaces gives road and environment
authorities a tool for establishing common practices or limits as to the use of surfacings meeting certain
noise criteria. However, it is not within the scope of this part of ISO 11819 to suggest such criteria.
Part 1 of ISO 11819 defines another method: The statistical pass-by (SPB) method. The close-proximity
(CPX) method proposed in this part of ISO 11819 has the same main objectives as the SPB method, but
is intended to be used specifically in applications that are complementary to it, such as:
— noise characterization of road surfaces at almost any arbitrary site, with the main purpose of
checking compliance with a surface specification (an example for conformity of production is
suggested in Reference [1]);
— checking the acoustic effect of maintenance and condition, e.g. wear of and damage to surfaces, as
well as clogging and the effect of cleaning of porous surfaces;
— checking the longitudinal and lateral homogeneity of a road section;
— development of quieter road surfaces and research on tyre/road interaction.
NOTE 1 This standard does not describe the conditions of application for formal purposes of the measurement
with the CPX method. Such conditions shall be defined in other standards or legal texts. However, suggestions for
the applicability of Part 1 and Part 2 of ISO 11819 are provided in Annex D.
Measurements with the CPX method are faster and more practical than with the SPB method, but are
more limited in the sense that it is relevant only in cases where tyre/road noise dominates and power
unit noise can be neglected. Furthermore, it cannot take heavy vehicle tyre/road noise into account as
fully as the SPB method can, since it does not make use of truck tyres for testing and does not take
power unit noise into account.
NOTE 2 The CPX method specified in this part of ISO 11819 is intended to measure the properties of road
surfaces, not the properties of tyres. If the method is used for testing tyres, the loads and inflations should
normally be adjusted to other values than specified in this standard.
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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 3911, Wheels and rims for pneumatic tyres — Vocabulary, designation and marking
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic
method for the determination of repeatability and reproducibility of a standard measurement method
ISO 10844, Acoustics — Specification of test tracks for measuring noise emitted by road vehicles and their
tyres
ISO 11819-1, Acoustics — Measurement of the influence of road surfaces on traffic noise— Part 1:
Statistical Pass-By method
ISO/TS 11819-3, Acoustics — Measurement of the influence of road surfaces on traffic noise — Part 3:
Reference tyres
ISO/TS 13471-1, Acoustics — Temperature influence on tyre/road noise measurement — Part 1:
Correction procedure when testing with the CPX method
ISO 13473-1, Characterization of pavement texture by use of surface profiles — Part 1: Determination of
Mean Profile Depth
IEC 60942, Electroacoustics — Sound calibrators
IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters
IEC 61672-1:2013, Electroacoustics — Sound level meters — Part 1: Specifications
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11819-1 and the following
apply.
3.1 Road and pavement related definitions
3.1.1
road section
the total stretch of the road lane subject to testing
3.1.2
road segment
part of a road section, being 20 m long and intended for normalization of sound pressure levels from the
actual speed on that segment to a certain reference speed

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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
3.2 Measurement methods and equipment
3.2.1
statistical pass-by method
SPB method
measurement procedure designed to evaluate vehicle and traffic noise generated on different sections
of road surface under specific traffic conditions
Note 1 to entry: The measurements are taken from a great number of vehicles operating normally on the road.
Results obtained using this procedure are normalized to standard speeds according to the category or type of road
being considered. The method is specified in ISO 11819–1.
3.2.2
reference tyres
test tyres specified for the purpose of representing certain features in tyre/road sound emission,
designed and constructed for use in this method with specified and reproducible standard properties
Note 1 to entry: The reference tyres are specified in ISO/TS 11819-3.
3.3 Acoustic quantities and symbols
3.3.1
CPX level
L
CPX
time-averaged A-weighted sound pressure level of the tyre/road noise as determined by the CPX
method, either broadband or spectral bands, as required
Note 1 to entry: The CPX level is expressed in decibels. In order to provide more information, additional suffixes
are used; see Table 1.
3.3.2
CPX level for passenger cars and other light vehicles
CPXP
sound level characterising the road surface under test, which is based on the tyre/road sound pressure
levels of one or more tyres representative of passenger car tyres
Note 1 to entry: The CPXP is expressed in decibels. Passenger tyres are denoted P1, P2 …. .
3.3.3
CPX level for heavy vehicles
CPXH
sound level characterising the road surface under test, which is based on the tyre/road sound pressure
levels of one or more tyres representative of heavy vehicle tyres
Note 1 to entry: The CPXH is expressed in decibels. Heavy vehicle tyres are denoted H1, H2 …. .
3.3.4
CPX index
CPXI
index composed of the weighted average of the CPX level for passenger cars and other light vehicles
(CPXP) and CPX level for heavy vehicles (CPXH)
Note 1 to entry: The CPXI is expressed in decibels. The method is intended to describe performance of road
surfaces for a certain traffic composition in a similar way to the SPB method in ISO 11819–1, although the
numerical values for a given speed are higher.
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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
3.3.5
acoustic variability due to road surface inhomogeneities
s
t
the standard deviation of the A-weighted SPL values for all segments, when using reference tyre t
Note 1 to entry: The acoustic variability is expressed in decibels. This variability is normally dominated by road
surface variations, although random errors could add a little. Measurement speed and wheel tracks normally do
not influence this value significantly. This measure is, therefore, considered to be an indication of road surface
homogeneity as far as noise properties are concerned.
3.4 Symbols used for correction terms
3.4.1
speed coefficient
B
coefficient determining the speed dependence of the sound pressure levels, normally used for
correction of the sound pressure level to a certain reference speed
Note 1 to entry: The speed coefficient is dimensionless.
3.4.2
reference speed
vr
preferred speed for measurement
Note 1 to entry: The reference speed is expressed in kilometres per hour. It can be 40 km/h, 50 km/h, 80 km/h
or 100 km/h.
3.4.3
measured speed
ν
actual speed during a measurement
Note 1 to entry: The measured speed is expressed in kilometres per hour.
3.4.4
temperature correction factor
C
T, t
quantity representing correction of CPX level for temperature for tyre t
Note 1 to entry: The temperature correction factor is expressed in dB per degree Celcius.
3.4.5
tyre tread hardness correction factor
C
SH, t
quantity representing correction of CPX level for rubber hardness of the tread of tyre t
Note 1 to entry: The tyre tread hardness correction factor is expressed in dB per Shore type A.
3.4.6
device dependent correction for sound reflections
C
d, f
correction for individual measuring devices in one-third-octave bands from 315 Hz to 5 000 Hz with the
centre frequency f to account for deviations from acoustic hemi-free-field conditions
Note 1 to entry: The device correction for sound reflections is expressed in dB.
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oSIST prEN ISO 11819-2:2015
ISO/DIS 11819-2.2
4 Symbols and abbreviated terms
Table 1 lists the symbols used in this part of ISO 11819.
Table 1 — Symbols and abbreviated terms used in this standard and their value or unit
Symbol Value/unit Explanation
Measure of the acoustic properties of the tested road section, for
CPXP = L
dB
vvCPX:P,r
tyre(s) representing light vehicles, at the reference speed, vr
Measure of the acoustic properties of the tested road section, for

CPXH = L
dB
vr CPX:H,vr
tyre(s) representing heavy vehicles, at the reference speed, vr
“CPX index” representing the overall acoustic properties of the
CPXI =
vr

dB tested road section, for tyre(s) representing light and heavy
0,5⋅+CPXP 0,5⋅CPXH
vr vr
vehicles combined (with equal weighting), at the ref. speed, vr
Speed coefficient; i.e. increase in CPX level with 10-fold increase
B Dimensionless in speed, to be able to correct for deviations from the reference
speed, vr
Device dependent correction term to account for deviations from
C dB
d, f
free field conditions
Temperature correction for tyre t to account for deviations from
C
...