SIST EN 29053:1999
(Main)Acoustics - Materials for acoustical applications - Determination of airflow resistance (ISO 9053:1991)
Acoustics - Materials for acoustical applications - Determination of airflow resistance (ISO 9053:1991)
The standard specifies two methods for the determination of the airflow resistance of porous materials for acoustical applications
Akustik - Materialien für akustische Anwendungen - Bestimmung des Strömungswiderstandes (ISO 9053:1991)
Acoustique - Matériaux pour applications acoustiques - Détermination de la résistance a l'écoulement de l'air (ISO 9053:1991)
La présente Norme internationale prescrit deux méthodes de détermination de la résistance à l'écoulement de l'air des matériaux poreux utilisés pour applications acoustiques. Elle s'applique à des éprouvettes découpées dans des matériaux poreux.
NOTE 1 Les publications qui traitent du comportement des matériaux à l'écoulement tant en régime laminaire que turbulent sont indiquées dans l'annexe A.
Akustika - Gradiva za uporabo v akustiki – Določevanje pretočnega upora zraka (ISO 9053:1991)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 29053:1999
01-november-1999
$NXVWLND*UDGLYD]DXSRUDERYDNXVWLNL±'RORþHYDQMHSUHWRþQHJDXSRUD]UDND
,62
Acoustics - Materials for acoustical applications - Determination of airflow resistance
(ISO 9053:1991)
Akustik - Materialien für akustische Anwendungen - Bestimmung des
Strömungswiderstandes (ISO 9053:1991)
Acoustique - Matériaux pour applications acoustiques - Détermination de la résistance a
l'écoulement de l'air (ISO 9053:1991)
Ta slovenski standard je istoveten z: EN 29053:1993
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.100.60 0DWHULDOL]DWRSORWQRLQ Thermal and sound insulating
]YRþQRL]RODFLMR materials
SIST EN 29053:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 29053:1999
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SIST EN 29053:1999
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SIST EN 29053:1999
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SIST EN 29053:1999
IS0
INTERNATIONAL
STANDARD 9053
First edition
1991-07-01
Acoustics - Materials for acoustical
applications - Determination of airflow
resistance
Acoustique - Ma t&iaux pour applications acoustiques - D6termina tion
de la r&istance 2 I’koulement de /‘air
Reference number
IS0 9053: 199 1 (E)
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SIST EN 29053:1999
IS0 9053:1991 (E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an lnter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard IS0 9053 was prepared by Technical Committee
ISO/TC 43, Acoustics.
Annex A of this International Standard is for information only.
0 is0 1991
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without
permission in writing from the publisher.
lnternationa I Organization for Standard ization
Case Postal e 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii
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SIST EN 29053:1999
IS0 9053:1991(E)
Introduction
The airflow resistance of porous materials indicates, in an indirect
manner, some of their structural properties. It may be used to establish
correlations between the structure of these materials and some of their
acoustical properties (for example, absorption, attenuation, etc.).
This International Standard is, therefore, useful for two purposes:
a) in relating some of the acoustical proper-ties of porous materials to
their struct ure an d their method of manufactu re;
b) in ensuring product quality (quality control).
. . .
III
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SIST EN 29053:1999
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SIST EN 29053:1999
__-~~~ -~-
IS0 9053:1991 (E)
INTERNATIONAL STANDARD
- Materials for acoustical applications -
Acoustics
Determination of airflow resistance
is the airflow resistance, in Pascal sec-
1 Scope
onds per cubic metre, of the test speci-
men;
This International Standard specifies two methods
for the determination of the airflow resistance of
A is the cross-sectional area, in square
porous materials for acoustical applications.
metres, of the test specimen perpen-
dicular to the direction of flow.
It is applicable to test specimens cut from products
of porous materials.
It is expressed in Pascal seconds per metre.
NOTE 1 Details of publications relating to flow behav-
2.3 airflow resistivity, Y: If the material is con-
iour under both iaminar and turbulent conditions are given
sidered as being homogeneous, that quantity de-
in annex A.
fined by
R
y=-S
2 Definitions
d
For the purposes of this International Standard, the
where
following definitions apply.
R is the specific airflow resistance, in
S
2.1 airflow resistance, R: A quantity defined by Pascal seconds per metre, of the test
specimen;
AP
/
R=T- d is the thickness, in metres, of the test
specimen in the direction of flow.
where
It is expressed in p~cal seconds per square metre.
is the air pressure difference, in pascals,
AP
across the test specimen with respect to 2.4 linear airflow velocity, IA: A quantity defined by
the atmosphere;
4V
lCZ-----
is the volumetric airflow rate, in cubic
A
4V
metres per second, passing through the
.
where
test specimen.
It is expressed in Pascal seconds per cubic metre. is the volumetric airflow rate, in cubic
4v
metres per second, passing through the
test specimen;
2.2 specific airflow resistance, R,: A quantity de-
fined by
A is the cross-sectional area, in square
R RA
metres, of the test specimen.
S=
It is expressed in metres per second.
where
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SIST EN 29053:1999
IS0 9053:1991(E)
rflow
Volumetric ai
rate, 4v
Cross-section (area A )
P a
‘- Porous material
Pb AP =Pb -Pa
Figure 1 - Direct airflow method (method A) - Basic principle
Porous material
V
PI
Piston :
frequencyf
stroke h
volumetric airflow rate qv
Figure 2 - Alternating airflow method (method B) - Basic principle
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SIST EN 29053:1999
IS0 9053:1991 (E)
4 Equipment
3 Principle
4.1 Equipment for method A
3.1 Direct airflow method (method A)
The equipment shall consist of
Passing of a controlled unidirectional airflow
a) a measurement cell into which the tes;t specimen
through a test specimen in the form of a circular is placed;
rectangular parallelepiped, and
cylinder or a
measurement of the resulting pressure drop be-
b) a device for producing a steady airflow;
tween the two free faces of the test specimen (see
figure 1).
c) a device for measuring the volumetric airflow
rate;
d) a device for measurinq the pressure difference
3.2 Alternating airflow method (method B)
across the test specimkn;
Passing of a slowly alternating airflow through a test
e) a device for measuring the thickness of the test
specimen in the form of a circular cylinder or a rec-
specimen when it is in position for the test.
tangular parallelepiped, and measurement of the
An example of suitable equipment is shown in
alternating component of the pressure in a test vol-
figure 3.
ume enclosed by the specimen (see figure2).
\
Piston with thickness indicator
Measurement cell
(cylindrical section)
Grill or perforated plate
Specimen
Specimen support:
- grill or perforated plate
Seal
Open to the atmosphere
-
. , Air supply
t Differential pressure- .
Flowmetetj s)
,
or vacuum
measuring device(s)
Measurement equipment, with cylindrical section, for direct airflow method (method A)
Figure 3 -
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SIST EN 29053:1999
IS0 9053:1991(E)
The arrangement used shall permit measurement
4.1 .I Measurement cell
of the airflow to an accuracy of -f:5 % of the indi-
The measurement cell shall be in the shape of a cated value.
circular cylinder or a rectangular parallelepiped. An
example of a cylindrical measurement cell is shown
4.1.4 Device for measuring differential pressure
in figure 3.
If it is circular in cross-section, the internal diameter The equipment used for measuring differential
shall be greater than 95 mm. pressures shall permit measurements of pressures
as low as 0,l Pa.
For the rectangular parallelepiped shape, the pre-
ferred cross-section is a square. In any case, all The arrangement used shall perrnit measurement
of the differential pressure to an accuracy of k 5 9/o
sides shall measure at least 90 mm.
of the indicated value.
The total height of the cell should be such that there
is essentially laminar undirectional airflow entering
and leaving the test specimen. The height should be
4.2 Equipment for method B
at least 100 mm greater than the thickness of the
test specimen.
The equipment shall consist of
The test specimen shall rest inside the measure-
measure ment cell into which the test specimen
a) a
ment cell (on a perforated support if necessary),
is placed;
positioned far enough above the base of the cell to
meet the above requirement. This support shall
b) a device for producinq an alternating airflow;
c \
have a minimum open area of 50 %, evenly distrib-
uted. The holes in the support shall have a diameter
c) a device for measuring the alternating compo-
not less than 3 mm.
nent of the pressure in the test volume enclosed
by the test specimen;
NOTE 2 In some cases it may be necessary to increase
the percentage of the open area in order not to restrict the
d) a device for measuring the thickness of the test
airflow through the test specimen.
specimen when it is in position for the test.
The tapping points for the measurement of pressure
Two examples of suitable equipment with different
and airflow shall be leak-free and arranged below
specimen holders are shown in figure4 and
the level of the perforated support.
figure 5.
4.1.2 Device for producing airflow
4.2.1 Measurement cell
It is recommended that pressure depression sys-
tems of the water reservoir or vacuum pump type
The measurement cell is composed of two parts:
be used. Alternatively, pressurization systems (air
compressor, etc.) may be used if they do not con-
a) the specimen holder;
taminate the air.
b) the test volume (see figure 4 and figure 5).
Whatever airflow source is used, the installation
shall permit fine control of the flow and shall ensure
Both parts shall be in the shape of a circular cylin-
the stability of the fl
...
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