EN ISO 3741:2010
(Main)Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms (ISO 3741:2010)
Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms (ISO 3741:2010)
ISO 3741:2010 specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured in a reverberation test room. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one-third-octave, is calculated using those measurements, including corrections to allow for any differences between the meteorological conditions at the time and place of the test and those corresponding to a reference characteristic impedance. Measurement and calculation procedures are given for both a direct method and a comparison method of determining the sound power level and the sound energy level.
In general, the frequency range of interest includes the one-third-octave bands with mid-band frequencies from 100 Hz to 10 000 Hz. Guidelines for the application of the specified methods over an extended frequency range in respect to lower frequencies are given in an annex. ISO 3741:2010 is not applicable to frequency ranges above the 10 000 Hz one-third-octave band.
The methods specified in ISO 3741:2010 are suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001.
The noise source under test can be a device, machine, component or sub-assembly. ISO 3741:2010 is applicable to noise sources with a volume not greater than 2 % of the volume of the reverberation test room. For a source with a volume greater than 2 % of the volume of the test room, it is possible that the achievement of results as defined in ISO 12001:1996, accuracy grade 1 (precision grade) is not feasible.
The test rooms that are applicable for measurements made in accordance with ISO 3741:2010 are reverberation test rooms meeting specified requirements.
Information is given on the uncertainty of the sound power levels and sound energy levels determined in accordance with ISO 3741:2010, for measurements made in limited bands of frequency and for A-weighted frequency calculations from them. The uncertainty conforms to ISO 12001:1996, accuracy grade 1 (precision grade).
Akustik - Bestimmung der Schallleistungs- und Schallenergiepegel von Geräuschquellen aus Schalldruckmessungen - Hallraumverfahren der Genauigkeitsklasse 1 (ISO 3741:2010)
1.1 Allgemeines
Diese Internationale Norm legt Verfahren für die Bestimmung des Schallleistungspegels oder des Schallenergiepegels einer Geräuschquelle aus Schalldruckpegeln fest, die in einem Hallraum gemessen werden. Der von der Geräuschquelle erzeugte Schallleistungspegel (oder der Schallenergiepegel bei Impulsen oder anderen Geräuschen kurzer Dauer) in Frequenzbändern von Terzbreite wird aus diesen Messungen berechnet; hierzu gehören auch alle Korrekturen zur Berücksichtigung jeglicher Unterschiede zwischen den meteorologischen Bedingungen am Ort und während der Zeit der Messung und den meteorologischen Bezugsbedingungen, die einer Bezugskennimpedanz entsprechen. Für zwei Verfahren, ein Direktverfahren und ein Vergleichs¬verfahren, werden Mess- und Rechenschritte für die Bestimmung des Schallleistungspegels und des Schallenergiepegels angegeben.
Im Allgemeinen umfasst der interessierende Frequenzbereich die Terzbänder mit den Mittenfrequenzen von 100 Hz bis 10 000 Hz. Für die Anwendung der festgelegten Verfahren in einem nach tieferen Frequenzen hin erweiterten Frequenzbereich sind Hinweise in Anhang E enthalten. Diese Internationale Norm darf nicht für Frequenzbereiche oberhalb des Terzbandes mit der Mittenfrequenz 10 000 Hz angewendet werden.
ANMERKUNG Für höhere Frequenzen können die in ISO 9295 festgelegten Verfahren angewendet werden.
1.2 Art der Geräusche und Geräuschquellen
Die in dieser Internationalen Norm festgelegten Verfahren sind für alle in ISO 12001 definierten Arten von Geräuschen geeignet (gleichförmige, ungleichförmige, schwankende, Einzel-Schallimpulse, usw.).
Die zu untersuchende Geräuschquelle kann ein Gerät, eine Maschine, Komponente oder Baugruppe sein. Diese Internationale Norm ist anwendbar auf Geräuschquellen mit einem Volumen von nicht mehr als 2 % des Hallraumvolumens. (...)
Acoustique - Détermination des niveaux de puissance et des niveaux d'énergie acoustiques émis par les sources de bruit à partir de la pression acoustique - Méthodes de laboratoire en salles d'essais réverbérantes (ISO 3741:2010)
L'ISO 3741:2010 spécifie des méthodes de détermination du niveau de puissance acoustique ou du niveau d'énergie acoustique émis par une source de bruit à partir des niveaux de pression acoustique mesurés dans une salle d'essai réverbérante. Le niveau de puissance acoustique (ou, dans le cas d'impulsions sonores ou d'émissions sonores transitoires, le niveau d'énergie acoustique) produit par la source de bruit, par bandes de fréquences d'un tiers d'octave, est calculé à l'aide de ces mesures, en incluant les corrections tenant compte de toute différence entre les conditions météorologiques existantes au moment et à l'emplacement où les essais sont réalisés et les conditions correspondant à l'impédance caractéristique de référence. Les méthodes de mesure et de calcul données pour déterminer le niveau de puissance acoustique et le niveau d'énergie acoustique comprennent une méthode directe et une méthode de comparaison.
Le domaine de fréquences représentatif comprend en règle générale les bandes d'un tiers d'octave de fréquences médianes comprises entre 100 Hz et 10 000 Hz. Des lignes directrices, pour l'application des méthodes spécifiées à un domaine de fréquences étendu vers les basses fréquences, sont données dans une annexe. L'ISO 3741:2010 n'est pas applicable au-delà de la bande d'un tiers d'octave centrée sur 10 000 Hz.
Les méthodes spécifiées dans l'ISO 3741:2010 sont applicables à tous les types de bruit (stable, non stable, fluctuant, impulsions acoustiques isolées, etc.) définis dans l'ISO 12001.
La source de bruit en essai peut être un dispositif, une machine, un composant ou un sous-ensemble. L'ISO 3741:2010 est applicable aux sources de bruit dont le volume ne dépasse pas 2 % de celui de la salle d'essai réverbérante. Pour une source dont le volume est supérieur à 2 % de celui de la salle d'essai, il est possible que l'obtention de résultats ayant une classe de précision 1 (classe laboratoire), telle que définie dans l'ISO 12001:1996, ne soit pas réalisable.
Les salles d'essai applicables aux mesurages réalisés conformément à l'ISO 3741:2010 sont les salles d'essai réverbérantes satisfaisant à des exigences spécifiées.
Des informations sont données sur l'incertitude associée aux niveaux de puissance acoustique et aux niveaux d'énergie acoustique déterminés conformément à l'ISO 3741:2010, pour des mesurages effectués dans des bandes de fréquences spécifiques et pour la somme pondérée A de toutes les bandes de fréquences. L'incertitude est conforme à celle de la classe de précision 1 (classe laboratoire) définie dans l'ISO 12001:1996.
Akustika - Določanje ravni zvočnih moči in ravni zvočne energije virov hrupa z zvočnim tlakom - Precizijska metoda za odmevnice (ISO 3741:2010)
Ta mednarodni standard določa metode za določevanje ravni zvočnih moči ali ravni zvočne energije virov hrupa iz ravni zvočnega tlaka, merjenimi v odmevnicah. Raven zvočne moči (ali v primeru prodorov hrupa ali prehodnih emisij hrupa raven zvočne energije), ki jo proizvede vir hrupa v frekvenčnih pasovih širine ene tretjine oktave se izračuna z uporabo teh merjenj, vključno s korekcijami, ki dopuščajo kakršne koli razlike med meteorološkimi pogoji v času in na kraju preskusa in tiste, ki ustrezajo referenčni karakteristični impedanci. Postopki merjenja in izračuna so podani tako za neposredno metodo kot za primerjalno metodo določevanja ravno zvočne moči in ravni zvočne energije. Na splošno frekvenčni razpon, ki nas zanima, vključuje pasove ene tretjine oktave s srednjimi frekvencami od 100 Hz do 10000 Hz. Smernice za uporabo opredeljenih metod pri razširjenemu frekvenčnemu razponu pri nižjih frekvencah so podane v Dodatku E. Ta mednarodni standard ne velja za frekvenčne razpone nad 10000 HZ pasu ene tretjine oktave.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2010
1DGRPHãþD
SIST EN ISO 3741:2009
$NXVWLND'RORþDQMHUDYQL]YRþQLKPRþLLQUDYQL]YRþQHHQHUJLMHYLURYKUXSD]
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Acoustics - Determination of sound power levels and sound energy levels of noise
sources using sound pressure - Precision methods for reverberation test rooms (ISO
3741:2010)
Akustik - Bestimmung der Schallleistungs- und Schallenergiepegel von Geräusch-
quellen aus Schalldruckmessungen - Hallraumverfahren der Genauigkeitsklasse 1 (ISO
3741:2010)
Acoustique - Détermination des niveaux de puissance acoustique et des niveaux
d'énergie acoustique émis par les sources de bruit a partir de la pression acoustique -
Méthodes de laboratoire en salles d'essais réverbérantes (ISO 3741:2010)
Ta slovenski standard je istoveten z: EN ISO 3741:2010
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 3741
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2010
ICS 17.140.01 Supersedes EN ISO 3741:2009
English Version
Acoustics - Determination of sound power levels and sound
energy levels of noise sources using sound pressure - Precision
methods for reverberation test rooms (ISO 3741:2010)
Acoustique - Détermination des niveaux de puissance et Akustik - Bestimmung der Schallleistungs- und
des niveaux d'énergie acoustiques émis par les sources de Schallenergiepegel von Geräusch- quellen aus
bruit à partir de la pression acoustique - Méthodes de Schalldruckmessungen - Hallraumverfahren der
laboratoire en salles d'essais réverbérantes (ISO Genauigkeitsklasse 1 (ISO 3741:2010)
3741:2010)
This European Standard was approved by CEN on 14 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
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CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
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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 3741:2010: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Annex ZA .4
Foreword
The text of ISO 3741:2010 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 3741:2010 by
Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS.
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 April 2011, and conflicting national standards shall be withdrawn at the
latest by April 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.
This document supersedes EN ISO 3741:2009.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
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 3741:2010 has been approved by CEN as a EN ISO 3741:2010 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the
Essential Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide one means of conforming to Essential Requirements of
the New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity
with the relevant Essential Requirements of that Directive and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the products falling
within the scope of this standard.
INTERNATIONAL ISO
STANDARD 3741
Fourth edition
2010-10-01
Acoustics — Determination of sound
power levels and sound energy levels of
noise sources using sound pressure —
Precision methods for reverberation test
rooms
Acoustique — Détermination des niveaux de puissance et des niveaux
d'énergie acoustiques émis par les sources de bruit à partir de la
pression acoustique — Méthodes de laboratoire en salles d'essais
réverbérantes
Reference number
ISO 3741:2010(E)
©
ISO 2010
ISO 3741:2010(E)
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ii © ISO 2010 – All rights reserved
ISO 3741:2010(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.2
3 Terms and definitions .2
4 Reference meteorological conditions .6
5 Reverberation test room.6
6 Instrumentation and measurement equipment .10
7 Definition, location, installation, and operation of noise source under test.10
8 Measurements in the reverberation test room .12
9 Determination of sound power levels and sound energy levels .19
10 Measurement uncertainty.27
11 Information to be recorded.30
12 Test report.31
Annex A (informative) Guidelines for the design of reverberation test rooms .32
Annex B (informative) Guidelines for the design of rotating diffusing vanes .34
Annex C (normative) Reverberation test room qualification procedure for the measurement of
broad-band sound .35
Annex D (normative) Reverberation test room qualification procedure for the measurement of
discrete-frequency components.37
Annex E (informative) Extension of frequency range to frequencies below 100 Hz.42
Annex F (normative) Calculation of octave band sound power levels and sound energy levels, A-
weighted sound power levels and A-weighted sound energy levels from one-third-octave
band levels .45
Annex G (informative) Guidelines on the development of information on measurement
uncertainty .48
Bibliography.60
ISO 3741:2010(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 3741 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This fourth edition cancels and replaces the third edition (ISO 3741:1999), which has been technically revised.
It also incorporates the Technical Corrigendum ISO 3741:1999/Cor.1:2001.
iv © ISO 2010 – All rights reserved
ISO 3741:2010(E)
Introduction
[2] [8]
This International Standard is one of the series ISO 3740 to ISO 3747 , which specify various methods for
determining the sound power levels and sound energy levels of noise sources including machinery, equipment
and their sub-assemblies. The selection of one of the methods from the series for use in a particular
application depends on the purpose of the test to determine the sound power level or sound energy level and
[2] [2]
on the facilities available. General guidelines to assist in the selection are provided in ISO 3740 . IS
...
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