EN ISO 15186-3:2010

SLOVENSKI STANDARD
01-december-2010
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Acoustics - Measurement of sound insulation in buildings and of building elements using
sound intensity - Part 3: Laboratory measurements at low frequencies (ISO 15186-
3:2002)
Akustik - Bestimmung der Schalldämmung in Gebäuden und von Bauteilen aus
Schallintensitätsmessungen - Teil 3: Messungen bei niedrigen Frequenzen im Prüfstand
(ISO 15186-3:2002)
Acoustique - Mesurage par intensité de l'isolation acoustique des immeubles et des
éléments de construction - Partie 3: Mesurages en laboratoire à de basses fréquences
(ISO 15186-3:2002)
Ta slovenski standard je istoveten z: EN ISO 15186-3:2010
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15186-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2010
ICS 91.120.20
English Version
Acoustics - Measurement of sound insulation in buildings and of
building elements using sound intensity - Part 3: Laboratory
measurements at low frequencies (ISO 15186-3:2002)
Acoustique - Mesurage par intensité de l'isolation Akustik - Bestimmung der Schalldämmung in Gebäuden
acoustique des immeubles et des éléments de construction und von Bauteilen aus Schallintensitätsmessungen - Teil 3:
- Partie 3: Mesurages en laboratoire à de basses Messungen bei niedrigen Frequenzen im Prüfstand (ISO
fréquences (ISO 15186-3:2002) 15186-3:2002)
This European Standard was approved by CEN on 5 August 2010.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15186-3:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 15186-3:2002 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 15186-3:2010 by
Technical Committee CEN/TC 126 “Acoustic properties of building elements and of buildings” the secretariat
of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2011, and conflicting national standards shall be withdrawn at
the latest by March 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 15186-3:2002 has been approved by CEN as a EN ISO 15186-3:2010 without any
modification.
INTERNATIONAL ISO
STANDARD 15186-3
First edition
2002-11-01
Acoustics — Measurement of sound
insulation in buildings and of building
elements using sound intensity —
Part 3:
Laboratory measurements at low
frequencies
Acoustique — Mesurage par intensité de l'isolation acoustique des
immeubles et des éléments de construction —
Partie 3: Mesurages en laboratoire à de basses fréquences

Reference number
ISO 15186-3:2002(E)
ISO 15186-3:2002(E)
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©
ii ISO 2002 – All rights reserved

ISO 15186-3:2002(E)
Contents Page
1 Scope . 1
1.1 General . 1
1.2 Precision . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Instrumentation . 4
4.1 General . 4
4.2 Calibration . 5
5 Test arrangement . 5
5.1 Rooms . 5
5.2 Test specimen . 5
5.3 Mounting conditions . 6
6 Test procedure . 6
6.1 General . 6
6.2 Generation of sound field . 6
6.3 Measurement of the average sound pressure level over the surface of the test specimen
in the source room . 6
6.4 Measurement of the average sound intensity level on the receiving side . 7
6.5 Background noise . 9
6.6 Frequency range of measurements . 10
7 Expression of results . 10
8 Test report . 10
Annexes
A Qualification . 11
B Estimated precision of the method. 13
Bibliography. 14
©
ISO 2002 – All rights reserved iii

ISO 15186-3:2002(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 15186 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 15186-3 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee
SC 2, Building acoustics.
ISO 15186 consists of the following parts, under the general title Acoustics — Measurement of sound insulation in
buildings and of building elements using sound intensity:
— Part 1: Laboratory measurements
— Part 2: In-situ conditions
— Part 3: Laboratory measurements at low frequencies
Annex A forms a normative part of this part of ISO 15186. Annex B is for information only.
©
iv ISO 2002 – All rights reserved

INTERNATIONAL STANDARD ISO 15186-3:2002(E)
Acoustics — Measurement of sound insulation in buildings and of
building elements using sound intensity —
Part 3:
Laboratory measurements at low frequencies
1 Scope
1.1 General
This part of ISO 15186 specifies a sound intensity method to determine the sound reduction index and the element-
normalized level difference of building elements at low frequencies. This method has significantly better
reproducibility in a typical test facility than those of ISO 140-3, ISO 140-10 and ISO 15186-1. The results are more
independent of the room dimensions of the laboratory and closer to values that would be measured between rooms
of volume greater than 300 m . This part of ISO 15186 is applicable in the frequency range 50 Hz to 160 Hz but is
mainly intended for the frequency range 50 Hz to 80 Hz.
NOTE For elements faced with thick, porous absorbers, the recommended frequency range is 50 Hz to 80 Hz.
The main differences between the methods of ISO 15186-1 and ISO 15186-3 are that in ISO 15186-3
a) the sound pressure level of the source room is measured close to the surface of the test specimen, and
b) the surface opposite the test specimen in the receiving room is highly absorbing and converts the room
acoustically into a duct with several propagating cross-modes above the lowest cut-on frequency.
The results found by the method of ISO 15186-3 can be combined with those of ISO 140-3 and ISO 15186-1 to
produce data in the frequency range 50 Hz to 5 000 Hz.
1.2 Precision
The reproducibility of this intensity method is, for all frequencies, estimated to be equal to or better than that found
100 Hz
with the method of ISO 140-3 at .
Some comparisons of data obtained with the methods of this part of ISO 15186 and ISO 140-3 are given in annex B.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 15186. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 15186 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated references,
the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of
currently valid International Standards.
ISO 140-1, Acoustics — Measurement of sound insulation in buildings and of building elements — Part1:
Requirements for laboratory test facilities with suppressed flanking transmission
ISO 140-3:1995, Acoustics — Measurement of sound insulation in buildings and of building elements — Part 3:
Laboratory measurements of airborne sound insulation of building elements
©
ISO 2002 – All rights reserved 1

ISO 15186-3:2002(E)
ISO 140-10, Acoustics — Measurement of sound insulation in buildings and of building elements — Part10:
Laboratory measurement of airborne sound insulation of small building elements
ISO 9614-1:1993, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 1: Measurement at discrete points
IEC 60942, Electroacoustics — Sound calibrators
IEC 61043:1993, Electroacoustics — Instruments for the measurement of sound intensity — Measurement with pairs
of pressure sensing microphones
3 Terms and definitions
For the purposes of this part of ISO 15186, the following terms and definitions apply.
3.1
average sound pressure level on a test surface
L
pS
ten times the common logarithm of the ratio of the surface and the time average of the sound pressure squared to the
square of the reference sound pressure
NOTE The surface average is taken over the entire test surface in the source room, including reflecting effects from the test
specimen.
3.2
sound reduction index
R
ten times the common logarithm of the ratio of the sound power, W , incident on the test specimen to the sound
power, W transmitted through the specimen
� �
W
R= 10 lg dB (1)
W
NOTE The expression “sound transmission loss” is also in use.
3.3
sound intensity
I
time-averaged rate of flow of sound energy per unit area oriented normal to the local particle velocity
NOTE This is a vectorial quantity which is equal to
T
�
−→ 1 W
−→
I = [p(t)· u (t)] dt (2)
T
m
where
p(t) is the instantaneous sound pressure at a point, in pascals;
−→
u (t) is the instantaneous particle velocity at the same point, in metres per second;
T is the averaging time, in seconds.
©
2 ISO 2002 – All rights reserved

ISO 15186-3:2002(E)
3.4
normal sound intensity
I
n
component of the sound intensity in the direction normal to a measurement surface defined by the unit normal vector
−→
n
−→
−→
I = I · n (3)
n
−→
where n is the unit normal vector directed out of the volume enclosed by the measurement surface
3.5
normal sound intensity level
L
In
ten times the common logarithm of the ratio of the unsigned value of the normal sound intensity to the reference
intensity I
� �
I
n
L = 10 lg dB (4)
In
I
−12 2
where I = 10 W/m
3.6
surface-pressure intensity indicator
F
pI
difference between the sound pressure level, L , and the normal sound intensity level, L , on the measurement
p In
surface, both being time and surface averaged
F = (L −L )dB
(5)
pI p In
NOTE This notation is according to ISO 9614-2. In ISO 9614-1 the notation F is used.
3.7
residual-pressure intensity index
δ
pI0
difference between the indicated sound pressure level, L , and the indicated sound intensity level, L , when the
p I
intensity probe is placed and oriented in a sound field such that the sound intensity is zero
NOTE 1 It is expressed in decibels.
NOTE 2 Details for determining δ are given in IEC 61043:
pI0
δ = (L −L )dB (6)
pI0 p I
3.8
intensity sound reduction index
R
I
for one source room and one receiving room with an absorbing back wall, index defined by
� � ��
S
m
R =L − 9− L + 10 lg dB (7)
I pS In
S
where
L is the average sound pressure level over the surface of the test specimen in the source room, in decibels;
pS
L is the average normal sound intensity level over the measurement surface in the receiving room, in
In
decibels;
©
ISO 2002 – All rights reserved 3

ISO 15186-3:2002(E)
S is the total area of the measurement surface(s), in square metres;
m
S is the area of the test specimen under test, in square metres.
NOTE Equation (7) is valid for a test specimen with a reflecting surface in the source room. It will also work satisfactorily for
moderately absorbing surfaces (e.g. surfaces covered with 100 mm thick porous absorbers). For 100 mm to 200 mm thick
absorbers, it is recommended to restrict the frequency range to 50 Hz to 80 Hz. For even thicker absorbers, the equation is no
longer valid.
3.9
intensity element normalized level difference
D
In,e
difference given by
� � � �
A
D = − 9− L − 10 lg 10 lgN (8)
L −
In,e pS In
S
m
where
L
is the average sound pressure level over the surface of the test specimen in the source room, in decibels;
pS
L is the average normal sound intensity level over the measurement surface in the receiving room, in
In
decibels;
A = 10 m ;
S is the total area of the measurement surface(s), in square metres;
m
is the number of small building element units installed within the measurement surface.
N
NOTE Equation (8) is valid for a test specimen with a reflecting surface in the source room. It will also work satisfactorily for
moderately absorbing surfaces (e.g. surfaces covered with 100 mm thick porous absorbers). For 100 mm to 200 mm thick
absorbers, it is recommended to restrict the frequency range to 50 Hz to 80 Hz. For even thicker absorbers, the equation is no
longer valid.
3.10
measurement surface
surface totally enclosing the test specimen on the receiving side, scanned or sampled by the probe during the
measurements
3.11
measurement distance
d
distance between the measurement surface and the specimen in a direction normal to the specimen
3.12
measurement sub-area
part of the measurement surface being measured with the intensity probe, using one continuous scan or discrete
positions
4 Instrumentation
4.1 General
−12 2
The intensity measuring instrumentation shall be capable of measuring intensity levels with reference to 10 W/m
in decibels in one-third-octave bands. The intensity shall be measured in real time when the scanning procedure is
use
...