SIST EN ISO 10848-1:2006
(Main)Acoustics - Laboratory measurement of the flanking transmission of airborne and impact sound between adjoining rooms - Part 1: Frame document (ISO 10848-1:2006)
Acoustics - Laboratory measurement of the flanking transmission of airborne and impact sound between adjoining rooms - Part 1: Frame document (ISO 10848-1:2006)
The general standard describes measurement methods to be performed in dedicated test facility in order to characterise the performances of one or several building components regarding the flanking transmissions. These performances can be used to compare different products, or to express a requirement, or to input into prediction methods, such as the series prEN 12354-1 and prEN 12354-2.
Akustik - Messung der Flankenübertragung von Luftschall und Trittschall zwischen benachbarten Räumen in Prüfständen - Teil 1: Rahmendokument (ISO 10848-1:2006)
ISO 10848 legt Messverfahren zur Bestimmung der Flankenübertragung eines oder mehrerer Bauteile fest, die in dafür ausgelegten Prüfständen durchzuführen sind. Die Gebrauchstauglichkeit der Bauteile wird entweder als Gesamtgröße für die Kombination von Bauteilen und Verbindungen (wie Dn,f und/oder Ln,f ) oder als Stoßstellendämm-Maß Kij einer Verbindung angegeben.
Dieser Teil Teil der ISO ISO 10848 enthält alle Begriffe, allgemeine Anforderungen an Prüfgegenstände und Prüfräume sowie Messverfahren, und es werden Anleitungen für die Wahl der zu messenden Größe in Abhängigkeit von der Verbindung und den Arten der beteiligten Bauteile gegeben. Andere Teile der ISO ISO 10848 legen die Anwendung für verschiedene Stoßstellenarten und Bauteile fest.
Die die Flankenübertragung charakterisierenden Größen können für den Vergleich unterschiedlicher Produkte oder für die Formulierung einer Anforderung oder als Eingangsdaten für Vorhersageverfahren, wie z. B. EN EN 12354-1 und EN EN 12354-2, herangezogen werden.
Acoustique - Mesurage en laboratoire des transmissions latérales du bruit aérien et des bruits de choc entre pieces adjacentes - Partie 1: Document cadre (ISO 10848-1:2006)
La norme générale décrit les méthodes de mesurage a utiliser dans une installation d'essai spécialisée afin de caractériser les performances d'un ou de plusieurs éléments de construction en matiere de transmissions latérales. Ces performances peuvent etre utilisées pour comparer différents produits, pour exprimer une exigence ou pour introduire des méthodes de prévision, comme la série prEN 12354-1 et prEN 12354-2.
Akustika - Laboratorijsko merjenje bočnega prenosa zvoka v zraku in udarnega zvoka med mejnimi prostori - 1. del: Okvirni dokument (ISO 10848-1:2006)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10848-1:2006
01-julij-2006
$NXVWLND/DERUDWRULMVNRPHUMHQMHERþQHJDSUHQRVD]YRNDY]UDNXLQXGDUQHJD
]YRNDPHGPHMQLPLSURVWRULGHO 2NYLUQLGRNXPHQW ,62
Acoustics - Laboratory measurement of the flanking transmission of airborne and impact
sound between adjoining rooms - Part 1: Frame document (ISO 10848-1:2006)
Akustik - Messung der Flankenübertragung von Luftschall und Trittschall zwischen
benachbarten Räumen in Prüfständen - Teil 1: Rahmendokument (ISO 10848-1:2006)
Acoustique - Mesurage en laboratoire des transmissions latérales du bruit aérien et des
bruits de choc entre pieces adjacentes - Partie 1: Document cadre (ISO 10848-1:2006)
Ta slovenski standard je istoveten z: EN ISO 10848-1:2006
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
SIST EN ISO 10848-1:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 10848-1:2006
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SIST EN ISO 10848-1:2006
EUROPEAN STANDARD
EN ISO 10848-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2006
ICS 91.120.20
English Version
Acoustics - Laboratory measurement of the flanking
transmission of airborne and impact sound between adjoining
rooms - Part 1: Frame document (ISO 10848-1:2006)
Acoustique - Mesurage en laboratoire des transmissions Akustik - Messung der Flankenübertragung von Luftschall
latérales du bruit aérien et des bruits de choc entre pièces und Trittschall zwischen benachbarten Räumen in
adjacentes - Partie 1: Document cadre (ISO 10848-1:2006) Prüfständen - Teil 1: Rahmendokument (ISO 10848-
1:2006)
This European Standard was approved by CEN on 16 March 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, 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: rue de Stassart, 36 B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10848-1:2006: E
worldwide for CEN national Members.
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SIST EN ISO 10848-1:2006
EN ISO 10848-1:2006 (E)
Foreword
This document (EN ISO 10848-1:2006) has been prepared by Technical Committee CEN/TC
126 "Acoustic properties of building elements and of buildings", the secretariat of which is held
by AFNOR, in collaboration with Technical Committee ISO/TC 43 "Acoustics".
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 October 2006, and conflicting national
standards shall be withdrawn at the latest by October 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
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.
2
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SIST EN ISO 10848-1:2006
INTERNATIONAL ISO
STANDARD 10848-1
First edition
2006-04-01
Acoustics — Laboratory measurement of
the flanking transmission of airborne and
impact sound between adjoining
rooms —
Part 1:
Frame document
Acoustique — Mesurage en laboratoire des transmissions latérales du
bruit aérien et des bruits de choc entre des pièces adjacentes —
Partie 1: Document cadre
Reference number
ISO 10848-1:2006(E)
©
ISO 2006
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
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ii © ISO 2006 – All rights reserved
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Quantities to characterize flanking transmission . 6
4.1 General. 6
4.2 Normalized flanking level difference D and normalised flanking impact sound pressure
n,f
level L . 6
n,f
4.3 Vibration reduction index, K . 6
ij
4.4 Selection of the principle of measurement . 8
5 Measuring equipment. 9
6 General requirements for test specimens and test rooms. 9
7 Measurement methods. 10
7.1 Measurement of D and L . 10
n,f n,f
7.2 Measurement of the vibration reduction index with structure-borne excitation . 12
7.3 Measurement of the structural reverberation time. 15
7.4 Measurement of the vibration reduction index with airborne excitation. 16
7.5 Frequency range of measurement. 17
8 Influences from the structures of the test facility . 17
8.1 Criterion to verify flanking transmissions through constructions of the test facility . 17
8.2 Conventional limit for light elements compared with the surrounding elements of the test
facility. 18
8.3 Verification procedure for a light flanking element that is structurally independent of a
separating element . 18
9 Shielding. 18
Annex A (normative) Single-number rating of the vibration reduction index. 24
Bibliography . 25
© ISO 2006 – All rights reserved iii
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10848-1 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 126, Acoustic properties of building elements and of buildings, in collaboration with Technical
Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics, in accordance with the Agreement
on technical cooperation between ISO and CEN (Vienna Agreement).
ISO 10848 consists of the following parts, under the general title Acoustics — Laboratory measurement of the
flanking transmission of airborne and impact sound between adjoining rooms:
⎯ Part 1: Frame document
⎯ Part 2: Application to light elements when the junction has a small influence
⎯ Part 3: Application to light elements when the junction has a substantial influence
The following part is under preparation:
⎯ Part 4: Application to all other cases
iv © ISO 2006 – All rights reserved
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SIST EN ISO 10848-1:2006
INTERNATIONAL STANDARD ISO 10848-1:2006(E)
Acoustics — Laboratory measurement of the flanking
transmission of airborne and impact sound between adjoining
rooms —
Part 1:
Frame document
1 Scope
ISO 10848 specifies measurement methods to be performed in a laboratory test facility in order to
characterize the flanking transmission of one or several building components. The performance of the building
components is expressed either as an overall quantity for the combination of elements and junction (such as
D and/or L ) or as the vibration reduction index K of a junction.
n,f n,f ij
This part of ISO 10848 contains definitions, general requirements for test specimens and test rooms, and
measurement methods. Guidelines are given for the selection of the quantity to be measured depending on
the junction and the types of building elements involved. Other parts of ISO 10848 specify the application for
different types of junction and building elements.
The quantities characterizing the flanking transmission can be used to compare different products, or to
express a requirement, or as input data for prediction methods, such as EN 12354-1 and EN 12354-2.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 140-1, Acoustics — Measurement of sound insulation in buildings and of building elements — Part 1:
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 140-6:1998, Acoustics — Measurement of sound insulation in buildings and of building elements —
Part 6: Laboratory measurements of impact sound insulation of floors
ISO 354, Acoustics — Measurement of sound absorption in a reverberation room
ISO 3382, Acoustics — Measurement of the reverberation time of rooms with reference to other acoustical
parameters
ISO 7626-1, Vibration and shock — Experimental determination of mechanical mobility — Part 1: Basic
definitions and transducers
© ISO 2006 – All rights reserved 1
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
ISO 10848-2:2006, Acoustics — Laboratory measurement of the flanking transmission of airborne and impact
sound between adjoining rooms — Part 2: Application to light elements when the junction has a small
influence
ISO 10848-3:2006, Acoustics — Laboratory measurement of the flanking transmission of airborne and impact
sound between adjoining rooms — Part 3: Application to light elements when the junction has a substantial
influence
IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters
IEC 60651, Sound level meters
IEC 60804, Integrating-averaging sound level meters
IEC 60942, Sound calibrators
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
average sound pressure level in a room
L
ten times the common logarithm of the ratio of the space and time average of the sound pressure squared to
the square of the reference sound pressure, the space average being taken over the entire room with the
exception of those parts where the direct radiation of a sound source or the near field of the boundaries (walls,
etc.) is of significant influence
NOTE 1 This quantity is expressed in decibels.
NOTE 2 If a continuously moving microphone is used, L is determined by
T
m
1
2
pt()dt
∫
T
m
0
L= 10 lg dB (1)
2
p
0
where
p is the sound pressure, in pascals;
p is the reference sound pressure, in pascals; p = 20 µPa;
0 0
T is the integration time, in seconds.
m
NOTE 3 If fixed microphone positions are used, L is determined by
22 2
pp++ .+p
12 n
L= 10 lg dB (2)
2
np⋅
0
where p , p , . p are r.m.s. (root mean square) sound pressures at n different positions in the room, in pascals.
1 2 n
NOTE 4 In practice usually the sound pressure levels L are measured. In this case L is determined by
i
n
1
L /10
i
L= 10 lg 10 dB (3)
∑
n
i=1
where L are the sound pressure levels L to L at n different positions in the room, in decibels.
i 1 n
2 © ISO 2006 – All rights reserved
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
3.2
normalized flanking level difference
D
n,f
difference in the space and time averaged sound pressure level produced in two rooms by one or more sound
sources in one of them, when the transmission only occurs through a specified flanking path
NOTE D is normalized to an equivalent sound absorption area (A ) in the receiving room and is expressed in
n,f 0
decibels:
A
DL=−L−10 lg dB (4)
n,f 1 2
A
0
where
L is the average sound pressure level in the source room, in decibels;
1
L is the average sound pressure level in the receiving room, in decibels;
2
A is the equivalent sound absorption area in the receiving room, in square metres;
2
A is the reference equivalent sound absorption area, in square metres; A = 10 m .
0 0
3.3
normalized flanking impact sound pressure level
L
n,f
space and time averaged sound pressure level in the receiving room produced by a standard tapping machine
operating at different positions on a tested floor in the source room, when the transmission only occurs
through a specified flanking path
NOTE L is normalized to an equivalent sound absorption area (A ) in the receiving room and is expressed in
n,f 0
decibels
A
LL=+10 lg dB (5)
n,f 2
A
0
where
L is the average sound pressure level in the receiving room, in decibels;
2
A is the equivalent sound absorption area in the receiving room, in square metres;
2
A is the reference equivalent sound absorption area, in square metres; A = 10 m .
0 0
3.4
average velocity level
L
v
ten times the common logarithm of the ratio of the time and space averaged mean squared normal velocity of
–9
an element to the squared reference velocity v (v = 1 × 10 m/s)
0 0
T
m
1
2
vt()dt
∫
T
m
0
L = 10 lg dB (6)
v
2
v
0
−9
NOTE 1 It should be stressed that the reference velocity preferred in ISO 1683 is 1 × 10 m/s, although a common
−8
reference value in some countries is still v = 5 × 10 m/s.
0
NOTE 2 Instead of the average velocity level, the average acceleration level L can be measured. The reference
a
−6 2
acceleration preferred in ISO 1683 is 1 × 10 m/s .
© ISO 2006 – All rights reserved 3
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
NOTE 3 If airborne or stationary structure-borne excitation is used, the spatial averaging is calculated with
22 2
vv+ +⋅⋅⋅⋅+v
12 n
L = 10 lg dB (7)
v
2
nv⋅
0
where v , v , v are r.m.s. (root mean square) velocities at n different positions on the element, in metres per second.
1 2 n
NOTE 4 For transient structure-borne excitation, use Equations (9) and (10).
3.5
structural reverberation time
T
s
time that would be required for the velocity or acceleration level in a structure to decrease by 60 dB after the
structure-borne sound source has stopped
NOTE 1 The quantity is expressed in seconds.
NOTE 2 The definition of T with a decrease by 60 dB of the velocity or acceleration level in a structure can be fulfilled
s
by linear extrapolation of shorter evaluation ranges.
3.6
velocity level difference
D
v,ij
difference between the average velocity level of an element i and that of an element j, when only the element i
is excited (airborne or structure-borne)
D = L – L (8)
v,ij v,i v,j
NOTE 1 If a transient structure-borne excitation is used, then the normal velocity should be measured simultaneously
on both elements and the velocity level difference determined by:
MN
1
(9)
DD= () dB
vi,,j ∑∑ vij mn
MN
mn==11
where
M is the number of excitation points on element i;
N is the number of transducer positions on each element for each excitation point;
(D ) is the velocity level difference as given by Equation (10) for one excitation point and one pair of transducer
v,ij mn
positions only, in decibels:
T
m
2
vt() dt
i
∫
0
()D =10lg dB (10)
vi, j mn
T
m
2
vt() dt
j
∫
0
and
v , v are the normal velocities at points on elements i and j respectively, in metres per second;
i j
T is the integration time, in seconds.
m
NOTE 2 For practical purposes, Equation (8) is preferable to Equation (9).
4 © ISO 2006 – All rights reserved
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
3.7
direction-averaged velocity level difference
D
vi,j
arithmetic average of D and D as defined by the following equation:
v,ij v,ji
1
DD=+()D dB (11)
vi,,j vij v,ji
2
where
D is the difference between the average velocity level of an element i and that of an element j, when
v,ij
only the element i is excited, in decibels;
D is the difference between the average velocity level of an element j and that of an element i, when
v,ji
only the element j is excited, in decibels.
3.8
equivalent absorption length a of an element j
j
length of a fictional totally absorbing junction of the element j when the critical frequency is assumed to be
1 000 Hz, giving the same losses as the total losses of the element j in a given situation
NOTE 1 a is expressed in metres.
j
NOTE 2 It is given by the following equation:
2
2,2 π S
j
a = (12)
j
f
Tc
s,j 0
f
ref
where
T is the structural reverberation time of the element j, in seconds;
s,j
S is the surface area of the element j, in square metres;
j
c is the speed of sound in air, in metres per second;
0
f is the current frequency, in hertz;
f is the reference frequency, in hertz (f = 1 000 Hz).
ref ref
NOTE 3 For lightweight, well-damped types of elements where the actual situation has no real influence on the sound
reduction index and damping of the elements, a is taken as numerically equal to the surface area S of the element:
j j
a = S /l , where the reference length l = 1 m.
j j 0 0
3.9
vibration reduction index
K
ij
value given by the following equation and expressed in decibels:
l
ij
KD=+10 lg dB (13)
ij v,ij
aa
ij
where
D is the direction-averaged velocity level difference between elements i and j, in decibels;
vi,j
l is the junction length between elements i and j, in metres;
ij
a , a are the equivalent absorption lengths of elements i and j, in metres.
i j
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
NOTE It follows from Equations (11) to (13) that K can be obtained from measurements of the velocity level
ij
difference in both directions across the junction as well as the structural reverberation time of the two elements.
3.10
light element
element for which the boundary conditions, when mounted in the test facility, have no influence on the test
result, for example because the element is much lighter than the surrounding test facility (see 8.2) or highly
damped
NOTE 1 A test element may be regarded as highly damped in case of a strong decrease in vibration across the
element as specified in 4.3.4.
NOTE 2 Timber or metal-framed stud walls or wooden floors on beams often fulfil this definition of a light element.
4 Quantities to characterize flanking transmission
4.1 General
In this part of ISO 10848, the flanking transmission by coupled elements and junctions is characterized in two
ways:
⎯ by an overall transmission quantity for a specified flanking path (D or L );
n,f n,f
⎯ by the vibration transmission over a junction (K ).
ij
Each of these quantities has its own restrictions and field of application.
4.2 Normalized flanking level difference D and normalized flanking impact sound
n,f
pressure level L
n,f
D and L characterize the flanking transmission over an element in the source room and an element in the
n,f n,f
receiving room, including the sound radiation in the receiving room. D and L depend on the dimensions of
n,f n,f
the elements involved.
D is measured with airborne excitation. For measurements of L , a standard tapping machine is used.
n,f n,f
4.3 Vibration reduction index, K
ij
4.3.1 General
The vibration reduction index K is defined in EN 12354-1 as a situation invariant quantity to characterize a
ij
junction between elements. K is determined according to Equation (13). It is based on power transmission
ij
considerations as a simplification of statistical energy analysis (SEA) theory. This implies in principle that the
basic assumptions of SEA are strictly met.
The main assumptions are that:
⎯ the coupling between i and j is weak;
⎯ the vibration fields in the elements are diffuse.
6 © ISO 2006 – All rights reserved
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
K might not be relevant in the following cases:
ij
a) elements that are strongly coupled, such that the individual elements cannot be considered as SEA
subsystems (see 4.3.3);
b) elements where the vibration field cannot be considered as reverberant due to a significant decrease in
vibration with distance across the element, for example due to high internal losses or periodic structure
(see 4.3.4);
c) low modal overlap factors or low mode counts.
The limitations are important for the frequency range where reliable measurements are expected, and/or for
the accuracy of the measurement results.
K is measured with structure-borne or airborne excitation.
ij
NOTE 1 With airborne excitation the vibrations of the source element are both forced and resonant. Since forced
vibrations do not always contribute to the vibration transmission through a junction, K measured with airborne excitation
ij
tends to be greater than when measured with structure-borne excitation. This is mainly the case below the critical
frequency, and the mentioned difference is therefore most important for lightweight elements.
[4]
NOTE 2 If values for R and R measured for elements i and j according to ISO 140-3 or ISO 15186-1 are available,
i j
K can be determined indirectly from D by
ij n,f
⎛⎞ ⎛ ⎞
aa S S
RR+
ij i j
ij
⎜⎟ ⎜ ⎟
KD=− −10 lg +10 lg
ij n,f
2 ⎜⎟ ⎜ ⎟
lA
ij 0
⎝⎠ ⎝ ⎠
In theory, this equation is only correct when R and R are associated with resonant transmission only. However, measured
i j
values obtained with ISO 140-3 or ISO 15186-1 also include forced transmission. In this part of ISO 10848, K is always
ij
measured directly as given by Equation (13) or (14).
4.3.2 K for lightweight well-damped elements
ij
For lightweight, well-damped types of elements (for example, timber or metal-framed stud walls or wooden
floors on beams) where the actual situation has no real influence on the sound reduction index and damping
of the elements, Equation (13) can be simplified as:
l
ij
KD=+ 10 lg dB (14)
ij v,ij
SS
ij
However, K is often not relevant for such elements because the vibration fields are not reverberant, and the
ij
application of K for light elements in prediction models such as EN 12354-1 and EN 12354-2 has in several
ij
cases been shown to be inaccurate. Therefore, the validity and practical use of K shall be evaluated for each
ij
specific case. An example of a useful application of K as given by Equation (14) is the comparison of different
ij
junctions between the same elements.
4.3.3 Strong coupling between elements
The measured value of K may not be relevant due to strong coupling, if the following condition is not
ij
satisfied:
⎛⎞mf
ijc
D W3 −10lg⎜⎟dB (15)
vi,j
⎜⎟
mf
jic
⎝⎠
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SIST EN ISO 10848-1:2006
ISO 10848-1:2006(E)
where
m , m are the masses per unit area of the elements, in kilograms per square metre;
i j
f , f are the critical frequencies of the elements, in hertz, for example determined by Equation (20).
ci cj
Inequality (15) is mainly of importance for heavy elements. If inequality (15) is not satisfied, try for example to
increase the energy loss by providing the edges of the elements with damping material or connecting them to
other structures.
4.3.4 Strong decrease in vibration across an element
If the measured velocity level decreases by more than 6 dB over the allowed measurement area for any
element of the tested junction when the accelerometer is moved away from a stationary vibration source
(keeping the minimum distance given in 7.2.4), then the measured value of K may not be relevant.
ij
NOTE A velocity level decrease of more than 6 dB can occur in, for example, lightweight elements such as timber or
metal-framed stud walls or wooden floors on beams. In some types of masonry walls, it can occur at high frequencies.
4.4 Selection of the principle of measurement
The different possibilities mentioned below are summarized in Table 1 according to the types of junction and
elements.
In certain cases, the tested specimen is placed in such a way in the test facility that only one path is dominant.
This is generally the case for suspended ceilings, or access floors, or lightweig
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