SIST ISO 140-7:1997

Acoustics -- Measurement of sound insulation in buildings and of building elements -- Part 7: Field measurements of impact sound insulation of floors

Acoustique -- Mesurage de l'isolation acoustique des immeubles et des éléments de construction -- Partie 7: Mesurage sur place de l'isolation des sols aux bruits de chocs

Akustika - Merjenje zvočne izolirnosti v zgradbah in zvočne izolirnosti gradbenih elementov - 7. del: Terenska merjenja izolirnosti medetažnih konstrukcij pred udarnim zvokom

General Information

• Status: Withdrawn
• Publication Date: 31-Mar-1997
• Withdrawal Date: 31-Oct-1999
• ICS: 17.140.01 - Acoustic measurements and noise abatement in general
• ICS: 91.060.01 - Elements of buildings in general
• ICS: 91.120.20 - Acoustics in building. Sound insulation
• Technical Committee: IGFI - Construction physics
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 01-Nov-1999
• Due Date: 01-Nov-1999
• Completion Date: 01-Nov-1999
• Ref Project: ISO 140-7:1978 - Acoustics — Measurement of sound insulation in buildings and of building elements — Part 7: Field measurements of impact sound insulation of floors

Relations

• Revised: ISO 140-7:1998 - Acoustics — Measurement of sound insulation in buildings and of building elements — Part 7: Field measurements of impact sound insulation of floors
• Effective Date: 12-May-2008

Standards Content (Sample)

INTERNATIONAL STANDARD
140 I VI1
~ ~
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*ME~KPYHAPOClHAR OPTAHU3AUUR i70 CTAHAAPTU3AUUUWRGANlSATlON INTERNATIONALE DE NORMALISATION
-L
Acoustics - Measurement of sound insulation in buildings
and of building elements -
Part VI1 : Field measurements of impact sound insulation
of floors
Acoustique - Mesurage de l7solation acoustique des immeubles et des d6rnents de construction -
Partie VI1 : Mesurage sur place de l'isolation des sols aux bruits de chocs
First edition - 1978-07-15
UDC 534.833.522.4.08 Ref. No. IS0 14O/Vll-1978 (E)
Descriptors : acoustics, acoustic measurement, acoustic insulation, buildings, structural members, floors, tests, testing conditions, field
tests, shock waves.
Price based on 5 pages

---------------------- Page: 1 ----------------------
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 member bodies). The work of developing
international Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up 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.
Draft international Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 140N I I was developed by Technical Committee
iSO/TC 43, Acoustics, and was circulated to the member bodies in May 1976.
It has been approved by the member bodies of the following countries :
Australia India
Romania
Austria Israel of
South Africa, Rep.
Belgium Italy Spain
Canada Japan Sweden
Czechoslovakia Korea, Rep. of Switzerland
Denmark
Mexico Turkey
Fin land
Netherlands United Kingdom
France New Zealand
U.S.A.
Germany
Norway U.S.S. R.
Hungary Poland
No member body expressed disapproval of the document.
This international Standard, together with International Standards IS0 140/1, I I I,
IV and VI, cancel and replace IS0 Recommendation R 140-1960, of which they
constitute a technical revision.
B is an integral part of this International Standard.
Annex
0 International Organization for Standardization, 1978
Printed in Switzerland

---------------------- Page: 2 ----------------------
INTERNATIONAL STANDARD IS0 14O/Vll-1978 (E)
Acoustics - Measurement of sound insulation in buildings
and of building elements -
Part VI1 : Field measurements of impact sound insulation
of floors
O INTRODUCTION ISOIR 354, Measurement of absorption coefficients in a
reverberation room.
The purpose of this International Standard is
ISOIR 71 7, Rating of sound insulation for dwellings.
- to give a procedure to measure the impact sound
insulation between two rooms in buildings, thus making I EC Publication 179, Precision sound level meters.
L
it possible to check whether the desired acoustical
I EC Publication 225, Octave, half-octave and third-octave
conditions have been obtained;
band filters intended for the analysis of sound and vi-
- to give a field procedure to determine whether bra tions.
building elements have met specifications and to check
whether faults have occurred during construction.
3 DEFINITIONS
3.1 average sound pressure level in a room : Ten times the
common logarithm of the ratio of the space and time
1 SCOPE AND FIELD OF APPLICATION
average of the sound pressure squared to the square of the
This International Standard specifies field methods for
reference
sound pressure, the space average being taken
measuring the impact sound insulation properties of floors
over the entire room with the exception of those parts
between two rooms by using a standard tapping machine
where the direct radiation of a sound source or the near
and for determining the protection afforded by floors to
field of the boundaries (wall, etc.) is of significant influence.
the occupants of the building.
This quantity is denoted by L :
The results obtained can be used to compare the impact
P; +Pf +. .+pi
sound insulation between rooms and to compare the
L = 1019 dB
. . . (1)
actual impact sound insulation with specified require-
ments.
where
When determining the impact sound insulation properties
4,
of a building element, the normalized impact sound level
p,,p2,. . .,p, are the r.m.s. sound pressures at n
(see 3.3) is used.
different positions in the room;
When determining the protection afforded to the occupants
po = 20 Pa is the reference sound pressure.
of the building, the standardized impact sound level
(see 3.4) is appropriate.
3.2 impact sound pressure level : The average sound
NOTE - Laboratory measurements of impact sound insulation of
pressure level in a specific frequency band in the receiving
floors are dealt with in IS0 140/VI.
room when the floor under test is excited by the stan-
dardized impact sound source. This quantity is denoted
by Li.
2 REFERENCES
3.3 normalized impact sound pressure level : The impact
IS0 140/11, Acoustics - Measurement of sound insulation
sound pressure level Li increased by a correction term
in buildings and of building elements - Part II : Statements
which is given in decibels, being ten times the common
of precision requirements.
logarithm of the ratio between the measured equivalent
absorption area A of the receiving room and the reference
IS0 14O/VI, Acoustics - Measurement of sound insulation
equivalent absorption area Ao. This quantity is denoted
in buildings and of building elements - Part VI - Labor-
by LL :
atory measurements of impact sound insulation of floors.
A
I SO 1401V I I I, Acoustics - Measurement of sound in-
Lk = Li + 10 lg -dB . . . (2)
sulation in buildings and of building elements - Part Vlll :
A0
Laboratory measurements of the reduction of transmitted
impact noise by floor coverings on a standard floor. where A. = 1 O m2.
1

---------------------- Page: 3 ----------------------
IS0 14O/V11-1978 (E)
3.4 standardized impact sound pressure level : The impact The indicating device should be designed to determine
sound pressure level Li reduced by a correction term which r.m.s. values of the sound pressure or corresponding
is given in decibels, being ten times the common logarithm pressure levels. If a sound level meter is used, it should
of the ratio between the measured reverberation time T of conform to IEC Publication 179 for precision sound level
the receiving room and the reference reverberation time To. meters. It is recommended to use the meter response
This quantity is denoted by LI, : "slow". The complete measuring system including the
microphone shall be adjusted before each series of measure-
T
ments to enable absolute values of sound pressure level to
LiL=/!., - 10lg-dB . . . (3)
be obtained. For sound level meters calibrated in a field of
TO
progressive plan waves a correction for the diffuse sound
For dwellings To is given by
field must be applied. (See IEC Publication 179,clause 8.2.)
To = 0,5 s
When in any frequency band the sound pressure level in the
NOTES
receiving room is less than 10 dB above the background
level, then the background level should be measured just
1 The standardizing of the impact sound pressure level to a rever-
beration time of 0,5s takes into account that in dwellings the before and after the determination of sound pressure level
reverberation time has been found to be (nearly independent of the
due to the sound source and a correction as given in the
volume and of frequency) equal to 0,5 s.
table shall be applied.
2 The standardizing of the impact sound pressure level to the
reverberation time of TO = 0.5 s is equivalent to standardizing the
TABLE - Correction to sound pressure level readings
impact sound pressure level to an equivalent absorption area of
A. = 0.32 V
Correction to be subtracted
where
Difference between sound from sound pressure level
pressure level measured with measured with tapping machine
A0 is the equivalent absorption area, in square metres;
tapping machine operating and operating to obtain sound
V is the volume of the receiving room, in cubic metres.
background level alone pressure level due to
tapping machine alone
3.5 reduction of impact sound pressure level (improve-
dB dB
ment of impact sound insulation) : The difference between
I
the average sound pressure levels in the receiving room
3
3
before and after installation of, for example, a floor cover-
ing; see IS0 14O/VIII. This quantity is denoted by AL.
4 to 5 2
6 6 to to 9 9 1 1
4 EQUIPMENT
The standardized impact sound source, i.e. the tapping
machine, should conform to IS0 140/VI. The further The above corrections, if any, are to be made to the indi-
equipment shall be suitable for meeting the requirements vidual readings.
of clause 6.
If the difference is less than 3 dB, i.e. the impact sound
pressure level is less than the background level, a precise
5 TEST ARRANGEMENT
value of the impact sound pressure level cannot be deter-
mined.
For the test arrangement to be used in the field, it is not
possible to standardize the area of the test specimen and
the volume and shape of the rooms.
In cases w
...

SLOVENSKI STANDARD
SIST ISO 140-7:1997
01-april-1997
$NXVWLND0HUMHQMH]YRþQHL]ROLUQRVWLY]JUDGEDKLQ]YRþQHL]ROLUQRVWLJUDGEHQLK
HOHPHQWRYGHO7HUHQVNDPHUMHQMDL]ROLUQRVWLPHGHWDåQLKNRQVWUXNFLMSUHG
XGDUQLP]YRNRP
Acoustics -- Measurement of sound insulation in buildings and of building elements --
Part 7: Field measurements of impact sound insulation of floors
Acoustique -- Mesurage de l'isolation acoustique des immeubles et des éléments de
construction -- Partie 7: Mesurage sur place de l'isolation des sols aux bruits de chocs
Ta slovenski standard je istoveten z: ISO 140-7:1978
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
91.060.01 Stavbni elementi na splošno Elements of buildings in
general
91.120.20 $NXVWLNDYVWDYEDK=YRþQD Acoustics in building. Sound
L]RODFLMD insulation
SIST ISO 140-7:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 140-7:1997

---------------------- Page: 2 ----------------------

SIST ISO 140-7:1997
INTERNATIONAL STANDARD
140 I VI1
~ ~
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*ME~KPYHAPOClHAR OPTAHU3AUUR i70 CTAHAAPTU3AUUUWRGANlSATlON INTERNATIONALE DE NORMALISATION
-L
Acoustics - Measurement of sound insulation in buildings
and of building elements -
Part VI1 : Field measurements of impact sound insulation
of floors
Acoustique - Mesurage de l7solation acoustique des immeubles et des d6rnents de construction -
Partie VI1 : Mesurage sur place de l'isolation des sols aux bruits de chocs
First edition - 1978-07-15
UDC 534.833.522.4.08 Ref. No. IS0 14O/Vll-1978 (E)
Descriptors : acoustics, acoustic measurement, acoustic insulation, buildings, structural members, floors, tests, testing conditions, field
tests, shock waves.
Price based on 5 pages

---------------------- Page: 3 ----------------------

SIST ISO 140-7:1997
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 member bodies). The work of developing
international Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up 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.
Draft international Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 140N I I was developed by Technical Committee
iSO/TC 43, Acoustics, and was circulated to the member bodies in May 1976.
It has been approved by the member bodies of the following countries :
Australia India
Romania
Austria Israel of
South Africa, Rep.
Belgium Italy Spain
Canada Japan Sweden
Czechoslovakia Korea, Rep. of Switzerland
Denmark
Mexico Turkey
Fin land
Netherlands United Kingdom
France New Zealand
U.S.A.
Germany
Norway U.S.S. R.
Hungary Poland
No member body expressed disapproval of the document.
This international Standard, together with International Standards IS0 140/1, I I I,
IV and VI, cancel and replace IS0 Recommendation R 140-1960, of which they
constitute a technical revision.
B is an integral part of this International Standard.
Annex
0 International Organization for Standardization, 1978
Printed in Switzerland

---------------------- Page: 4 ----------------------

SIST ISO 140-7:1997
INTERNATIONAL STANDARD IS0 14O/Vll-1978 (E)
Acoustics - Measurement of sound insulation in buildings
and of building elements -
Part VI1 : Field measurements of impact sound insulation
of floors
O INTRODUCTION ISOIR 354, Measurement of absorption coefficients in a
reverberation room.
The purpose of this International Standard is
ISOIR 71 7, Rating of sound insulation for dwellings.
- to give a procedure to measure the impact sound
insulation between two rooms in buildings, thus making I EC Publication 179, Precision sound level meters.
L
it possible to check whether the desired acoustical
I EC Publication 225, Octave, half-octave and third-octave
conditions have been obtained;
band filters intended for the analysis of sound and vi-
- to give a field procedure to determine whether bra tions.
building elements have met specifications and to check
whether faults have occurred during construction.
3 DEFINITIONS
3.1 average sound pressure level in a room : Ten times the
common logarithm of the ratio of the space and time
1 SCOPE AND FIELD OF APPLICATION
average of the sound pressure squared to the square of the
This International Standard specifies field methods for
reference
sound pressure, the space average being taken
measuring the impact sound insulation properties of floors
over the entire room with the exception of those parts
between two rooms by using a standard tapping machine
where the direct radiation of a sound source or the near
and for determining the protection afforded by floors to
field of the boundaries (wall, etc.) is of significant influence.
the occupants of the building.
This quantity is denoted by L :
The results obtained can be used to compare the impact
P; +Pf +. .+pi
sound insulation between rooms and to compare the
L = 1019 dB
. . . (1)
actual impact sound insulation with specified require-
ments.
where
When determining the impact sound insulation properties
4,
of a building element, the normalized impact sound level
p,,p2,. . .,p, are the r.m.s. sound pressures at n
(see 3.3) is used.
different positions in the room;
When determining the protection afforded to the occupants
po = 20 Pa is the reference sound pressure.
of the building, the standardized impact sound level
(see 3.4) is appropriate.
3.2 impact sound pressure level : The average sound
NOTE - Laboratory measurements of impact sound insulation of
pressure level in a specific frequency band in the receiving
floors are dealt with in IS0 140/VI.
room when the floor under test is excited by the stan-
dardized impact sound source. This quantity is denoted
by Li.
2 REFERENCES
3.3 normalized impact sound pressure level : The impact
IS0 140/11, Acoustics - Measurement of sound insulation
sound pressure level Li increased by a correction term
in buildings and of building elements - Part II : Statements
which is given in decibels, being ten times the common
of precision requirements.
logarithm of the ratio between the measured equivalent
absorption area A of the receiving room and the reference
IS0 14O/VI, Acoustics - Measurement of sound insulation
equivalent absorption area Ao. This quantity is denoted
in buildings and of building elements - Part VI - Labor-
by LL :
atory measurements of impact sound insulation of floors.
A
I SO 1401V I I I, Acoustics - Measurement of sound in-
Lk = Li + 10 lg -dB . . . (2)
sulation in buildings and of building elements - Part Vlll :
A0
Laboratory measurements of the reduction of transmitted
impact noise by floor coverings on a standard floor. where A. = 1 O m2.
1

---------------------- Page: 5 ----------------------

SIST ISO 140-7:1997
IS0 14O/V11-1978 (E)
3.4 standardized impact sound pressure level : The impact The indicating device should be designed to determine
sound pressure level Li reduced by a correction term which r.m.s. values of the sound pressure or corresponding
is given in decibels, being ten times the common logarithm pressure levels. If a sound level meter is used, it should
of the ratio between the measured reverberation time T of conform to IEC Publication 179 for precision sound level
the receiving room and the reference reverberation time To. meters. It is recommended to use the meter response
This quantity is denoted by LI, : "slow". The complete measuring system including the
microphone shall be adjusted before each series of measure-
T
ments to enable absolute values of sound pressure level to
LiL=/!., - 10lg-dB . . . (3)
be obtained. For sound level meters calibrated in a field of
TO
progressive plan waves a correction for the diffuse sound
For dwellings To is given by
field must be applied. (See IEC Publication 179,clause 8.2.)
To = 0,5 s
When in any frequency band the sound pressure level in the
NOTES
receiving room is less than 10 dB above the background
level, then the background level should be measured just
1 The standardizing of the impact sound pressure level to a rever-
beration time of 0,5s takes into account that in dwellings the before and after the determination of sound pressure level
reverberation time has been found to be (nearly independent of the
due to the sound source and a correction as given in the
volume and of frequency) equal to 0,5 s.
table shall be applied.
2 The standardizing of the impact sound pressure level to the
reverberation time of TO = 0.5 s is equivalent to standardizing the
TABLE - Correction to sound pressure level readings
impact sound pressure level to an equivalent absorption area of
A. = 0.32 V
Correction to be subtracted
where
Difference between sound from sound pressure level
pressure level measured with measured with tapping machine
A0 is the equivalent absorption area, in square metres;
tapping machine operating and operating to obtain sound
V is the volume of the receiving room, in cubic metres.
background level alone pressure level due to
tapping machine alone
3.5 reduction of impact sound pressure level (improve-
dB dB
ment of impact sound insulation) : The difference between
I
the average sound pressure levels in the receiving room
3
3
before and after installation of, for example, a floor cover-
ing; see IS0 14O/VIII. This quantity is denoted by AL.
4 to 5 2
6 6 to to 9 9 1 1
4 EQUIPMENT
The standardized impact sound source, i.e. t
...

140 / VI1
NORME INTERNATIONALE @
'*E!
INTERNATIONAL ORGANIZATION FOR STANDARDlZATIONOMEMYHAPOLlHAR OPrAHHJAUHR no CTAHnAFTM3AUHH.ORGANlSATlON INTERNATIONALE DE NORMALISATION
'L
Acoustique - Mesurage de l'isolation acoustique des
immeubles et des déments de construction -
Partie VI1 : Mesurage sur place de l'isolation des sols aux
bruits de chocs
Acoustics - Measurement of sound insulation in buildings and of building elements -
Part VI1 : Field measurements of impact sound insulation of floors
Première Bdition - 1978-07-15
W
PI
Rbf. no : IS0 14O/Vll-1978 (FI
CD U 534.833.522.4.08
Descripteurs : acoustique, mesurage acoustique, isolation acoustique, bâtiment, element de construction, plancher, essai, conditions d'essai,
essai en place, onde de choc.
Prix basé sur 5 pages

---------------------- Page: 1 ----------------------
1
AVANT-PROPOS
L'ISO (Organisation internationale de normalisation) est une fédération mondiale
d'organismes nationaux de normalisation (comités membres de I'ISO). L'élaboration
des Normes internationales est confiée aux comités techniques de I'ISO. Chaque
comité membre intéressé par une étude a le droit de faire partie du comité technique
et non
correspondant. Les organisations internationales, gouvernementales
gouvernementales, en liaison avec I'ISO, participent également aux travaux.
Les projets de Normes internationales adoptés par les comités techniques sont
soumis aux comités membres pour approbation, avant leur acceptation comme
Normes internationales par le Conseil de I'ISO.
La Norme internationale IS0 14O/VII a été élaborée par le comité technique
ISO/TC 43, Acoustique, et a été soumise aux comités membres en mai 1976.
Les comités membres des pays suivants l'ont approuvée :
Pologne
Afrique du Sud, Rép. d' France
Hongrie Roumanie
Allemagne
Inde Royaume-Uni
Australie
Israël Suède
Autriche
Italie Suisse
Belgique
Canada Japon Tchécoslovaquie
Corée, Rép. de Mexique Turquie
Danemark Norvège U.R.S.S.
U.S.A.
Espagne Nouvelle-Zélande
--
Y
Finlande Pays-Bas
Aucun comité membre ne l'a désapprouvée.
Cette Norme internationale, conjointement avec les Normes internationales
IS0 140/1, III, IV et VI, annule et remplace la Recommandation ISO/R 140-1960
dont elle constitue une révision technique.
L'annexe B fait partie intégrante de la présente Norme internationale.
'9 Organisation internationale de normalisation, 1978
Imprimé en Suisse

---------------------- Page: 2 ----------------------
~~~
NORME INTERNATIONALE IS0 14O/Vll-1978 (F)
Acoustique - Mesurage de l'isolation acoustique des
immeubles et des éléments de construction -
Partie VI1 : Mesurage sur place de l'isolation des sols aux
bruits de chocs
O INTRODUCTION
ISOIR 354, Mesure des coefficients d'absorption en salle
réverbéran te.
Le but de la présente Norme internationale est :
ISOIR 71 7, Évaluation de l'isolement acoustique des habi-
- de donner une méthode de mesurage de l'isolation
tations.
acoustique aux bruits de chocs entre deux pièces dans les
immeubles et, de cette manière, de permettre de contrô-
Publication CE1 179, Sonomètres de précision.
ler si les conditions acoustiques désirées ont été obtenues;
Publication CE1 225, Filtres de bandes d'octave, de demi-
- de donner une méthode applicable sur place pour
octave et de tiers d'octave destinés a l'analyse des bruits
déterminer si les éléments de construction sont confor-
et des vibrations.
mes aux spécifications et contrôler si des erreurs se sont
produites au cours de la construction.
3 DÉFINITIONS
3.1 niveau moyen de pression acoustique dans une pièce :
1 OBJET ET DOMAINE D'APPLICATION
Dix fois le logarithme décimal du rapport de la moyenne
La présente Norme internationale spécifie les méthodes
spatio-temporelle des carrés des pressions acoustiques au
applicables sur place pour déterminer les propriétés d'isola-
carré de la pression acoustique de référence, la moyenne
tion aux bruits de chocs des sols entre deux pièces, en utili-
spatiale étant prise dans l'étendue de la pièce, à l'exception
sant une machine à chocs normalisée, et pour déterminer la
des zones OÙ le rayonnement direct de la source et le champ
protection apportée par les sols aux occupants de l'immeuble.
proche des parois ont une influence notable. Cette grandeur
est désignée par L et est donnée par la formule :
On peut utiliser les résultats obtenus pour comparer I'isola-
tion aux bruits de chocs entre deux pièces et pour comparer
P: + P; + . . . +pi dB
l'isolation réelle aux bruits de chocs avec les spécifications.
L=lOlg . . . (1)
nP:
On utilise le niveau de pression du bruit de choc normalisé
(voir 3.3) lors de la détermination des propriétés d'isolation
où
aux bruits de chocs d'un élément de construction.
k
U
p1, p2, . . ., pn sont les pressions acoustiques efficaces
On applique le niveau de pression du bruit de choc standar-
relevées en n points différents de la pièce;
disé (voir 3.4) lors de la détermination de la protection
apportée aux occupants de l'immeuble.
Po = 20 pPa est la pression acoustique de référence.
NOTE - Les mesurages en laboratoire de l'isolation acoustique des
3.2 niveau de pression du bruit de choc : Niveau moyen de
sols aux bruits de chocs sont traites dans l'lS0 140/VI.
pression acoustique dans une bande de fréquences donnée
dans la salle de réception, lorsque le sol en essai est excité
z RÉFÉRENCES
par la source de bruit de choc normalisé. Cette grandeur est
désignée par Li.
IS0 140/11, Acoustique - Mesurage de l'isolation acous-
tique des immeubles et des éléments de construction -
3.3 niveau de pression du bruit de choc normalisé : Niveau
Partie II : Spécifications relatives d la fidélité.
de pression du bruit de choc, augmenté d'un terme correctif
exprimé en décibels, égal à dix fois le logarithme décimal du
IS0 140/VI, Acoustique - Mesurage de l'isolation acous-
rapport de l'aire d'absorption équivalente A mesurée de la
tique des immeubles et des éléments de construction -
salle de réception à l'aire d'absorption équivalente de réfé-
Partie VI : Mesurage en laboratoire de l'isolation des sols
rence Ao. Cette grandeur est désignée par LL et est donnée
aux bruits de chocs.
par la formule :
I SO 1401V I I I, Acoustique - Mesurage de l'isolation acous-
Lk = Li + 1 O lg -dB A
-
tique des immeubles et des éléments de construction
. . . (2)
Partie Vlll : Mesurage en laborztoire de la réduction de la
A0
transmission des bruits de chocs par les revêtements de sol
sur plancher normalisé.
1

---------------------- Page: 3 ----------------------
IS0 14O/Vll-1978 (F)
k
peut obtenir cette moyenne au moyen d’un nombre de
3.4 niveau de pression du bruit de
positions fixes du microphone, ou a l’aide d’un microphone
Niveau de pression du bruit de choc Li, diminué d‘un terme
mobile avec intégration de p2.
correctif exprimé en décibels, égal à dix fois le logarithme
décimal du rapport de la durée de réverbération T de la salle
L’appareil indicateur doit êtreconcu pour donner les valeurs
de réception à la durée de réverbération de référence To.
efficaces de la pression acoustique ou les niveaux de pres-
Cette grandeur est désignée par LkT et est donnée par la
c sion correspondants. Si l’on utilise un sonomètre, il doit
formule :
être conforme à la publication CE1 179 concernant les
sonomètres de précision. II est recommandé d’utiliser la
T
LiT = Li - 10 Ig-dB . . . (3)
réponse ((lente)). L’appareillage de mesurage complet, y
0 TO
compris le microphone, doit être réglé avant chaque série de
mesurages pour permettre d’obtenir des valeurs absolues du
Pour les habitations
niveau de pression acoustique. Pour les sonomètres étalon-
nés dans un champ acoustique d’ondes progressives, une
To = 0,5 s
correction du champ diffus doit être appliauée. (Voir
NOTES
Publication CE1 179, chapitre 8.2.)
1 La normalisation du niveau de pression du bruit de choc en fonc-
Lorsque, dans une bande de fréquences quelconque, le
0.5 s tient compte du fait que,
tion de la durée de reverberation de
dans les habitations, la durée de réverbération est égale à 0.5 s indé-
niveau de pression acoustique dans la salle de réception est
pendamment du volume et de la fréquence.
supérieur de moins de 10 dB au niveau du bruit de fond, on
et juste après le mesu-
2 La normalisation du niveau de pression du bruit de choc en fonc- doit mesurer ce dernier juste avant
tion de la durée de reverberation TO = 0,5 s est équivalente à la
rage du niveau de pression acoustique de la source de bruit,
normalisation du niveau de pression du bruit de choc en fonction
et l’on doit appliquer les corrections conformément au
d‘une aire d’absorption équivalente :
tableau suivant.
A. = 0.32 V
TABLEAU - Corrections dues au niveau de pression acoustique
où
du bruit de fond
A0 est l‘aire d‘absorption équivalente, en mètres carrés;
V est le volume de la salle de reception, en mètres cubes.
Différence entre le niveau
de pression acoustique mesuré
de pression acoustique mesuré
avec la machine à chocs en
avec la source de bruit et
3.5 affaiblissement acoustique brut (amélioration de I‘iso-
fonctionnement pour obtenir
le niveau de pression acoustique
lation aux bruits de chocs) : Différence entre les niveaux
moyens de pression acoustique dans la salle de réception, dO à la machine à chocs seule
avant et après l‘installation, par exemple, d’un revêtement
I dB I dB
de sol (voir I’ISO 14O/VIII). Cette grandeur est désignée
par AL.
3
4 APPAREILLAGE
La source de bruit de choc normalisé, c‘est-à-dire la machine
à chocs, doit être conforme à I‘ISO 140/VI. L‘appareillage
complémentaire doit pouvoir satisfaire aux spécifications
Les corrections ci-dessus, si elles sont nécessaires, doivent
du chapitre 6. être effectuées sur les lectures individuelles.
Si la différence est inférieure à 3 dB, c’est-à-dire si le niveau
5 DISPOSITIONS POUR L‘ESSAI de pression du bruit de choc est inférieur au niveau du bruit
de fond, on ne peut déterminer une valeur précise du
Pour les essais sur place, il n‘est pas possible de normaliser
niveau de pression du bruit de choc.
l‘aire de I’éprouve
...