CEN ISO/TS 7849-2:2022
(Main)Acoustics - Determination of airborne sound power levels emitted by machinery using vibration measurement - Part 2: Engineering method including determination of the adequate radiation factor (ISO/TS 7849-2:2009)
Acoustics - Determination of airborne sound power levels emitted by machinery using vibration measurement - Part 2: Engineering method including determination of the adequate radiation factor (ISO/TS 7849-2:2009)
ISO/TS 7849-2:2009 gives basic requirements for a reproducible method for the determination of the sound power level of the noise emitted by machinery or equipment by using surface vibration measurements, together with the knowledge of the machinery specific sound radiation factor in the frequency bands. The method is only applicable to noise which is emitted by vibrating surfaces of solid structures and not to noise generated aerodynamically.
This vibration measurement method is especially applicable in cases where accurate direct airborne noise measurements, e.g. as specified in ISO 3746, ISO 3747, and ISO 9614 (all parts), are not possible because of high background noise or other parasitic environmental interferences; or, if a distinction is required between the total radiated sound power and its structure vibration generated component.
The methods described in ISO/TS 7849-2:2009 apply mainly to processes that are stationary with respect to time.
Recommendations on the selection of frequency bands are given in an annex.
Akustik - Bestimmung der von Maschinen abgestrahlten Luftschallleistungspegel durch Schwingungsmessung - Teil 2: Verfahren der Genauigkeitsklasse 2 einschließlich Bestimmung des geeigneten Abstrahlgrads (ISO/TS 7849-2:2009)
Dieser Teil von ISO/TS 7849 enthält grundlegende Anforderungen an ein reproduzierbares Verfahren zur Bestimmung des Schallleistungspegels der von Maschinen oder Geräten abgestrahlten Geräusche durch Messung von Oberflächenschwingungen in Verbindung mit der Kenntnis des maschinenspezifischen Schallabstrahlgrads in den Frequenzbändern. Das Verfahren ist nur auf Geräusche anwendbar, die von schwingenden Oberflächen fester Körper abgestrahlt werden, nicht aber auf aerodynamisch erzeugte Geräusche.
Dieses Schwingungsmessverfahren ist insbesondere dann anwendbar, wenn genaue direkte Luftschallmessungen, z. B. nach ISO 3746 [7], ISO 3747 [8] und ISO 9614 (alle Teile) [14], aufgrund starker Fremdgeräusche oder anderer störender Umwelteinflüsse nicht möglich sind oder wenn eine Unterscheidung zwischen der gesamten abgestrahlten Schallleistung und ihrer durch Körperschall erzeugten Komponente erforderlich ist.
ANMERKUNG 1 Eine der Anwendungen dieses Teils von ISO/TS 7849 ist die Unterscheidung zwischen der Abstrahlung von Luftschallleistung, die durch Körperschall erzeugt wird, und den aerodynamischen Schallleistungskomponenten. Eine solche Unterscheidung ist mit ISO 3744 [5], ISO 3745 [6], ISO 3746 [7] und ISO 9614 (alle Teile) [14] nicht möglich.
ANMERKUNG 2 Probleme dürfenN3 auftreten, wenn das Geräusch von kleinen Teilen der Maschinenoberflächen (Schleifkontakte, z. B. Schleifringbürste oder der Kommutator und die Bürste in elektrischen Maschinen) erzeugt wird.
Die in diesem Teil von ISO/TS 7849 beschriebenen Verfahren gelten hauptsächlich für Prozesse, die zeitlich stationär sind.
Empfehlungen für die Auswahl von Frequenzbändern sind in Anhang C enthalten.
Acoustique - Détermination des niveaux de puissance acoustique aériens émis par les machines par mesurage des vibrations - Partie 2: Méthode d'expertise incluant la détermination d'un facteur de rayonnement approprié (ISO/TS 7849-2:2009)
Akustika - Določanje ravni zvočnih moči v zraku, ki jih povzročajo stroji, z merjenjem vibracij - 2. del: Informativna metoda, ki vključuje določanje ustreznega faktorja sevanja (ISO/TS 7849-2:2009)
Ta del standarda ISO/TS 7849 podaja osnovne zahteve za ponovljivo metodo za določanje ravni zvočne moči hrupa, ki ga oddajajo stroji ali oprema, z merjenjem vibracij na površinah ob poznavanju faktorja zvočnega sevanja v frekvenčnih pasovih, ki je določen za posamezen stroj. Metoda se uporablja samo za hrup, ki ga oddajajo vibrirajoče površine trdnih struktur, in ne za aerodinamično ustvarjeni hrup.
Ta metoda merjenja vibracij se uporablja zlasti v primerih, ko točnih meritev hrupa, ki se prenaša neposredno po zraku, npr. kot je določeno v standardih ISO 3746[7], ISO 3747[8] in ISO 9614 (vsi deli)[14], ni mogoče izvesti zaradi močnega šuma v ozadju ali drugih parazitskih motenj v okolju, ali kadar je treba razlikovati med skupno izsevano zvočno močjo in njeno komponento, ki ustvarja strukturne vibracije.
OPOMBA 1: Eden od načinov uporabe tega dela standarda ISO/TS 7849 je razlikovanje med sevanjem zvočne moči v zraku, ki jo ustvarjajo strukturne vibracije, in aerodinamičnimi komponentami zvočne moči. Pri standardih ISO 3744[5], ISO 3745[6], ISO 3746[7] in ISO 9614 (vsi deli)[14] takšno razlikovanje ni izvedljivo.
OPOMBA 2: Težave se lahko pojavijo, če hrup ustvarjajo majhni deli površin strojev (drsni kontakti, npr. ščetka na drsnem obroču ali komutator in ščetka v električnih strojih).
Metode, opisane v tem delu standarda ISO/TS 7849, se uporabljajo predvsem za procese, ki so stacionarni glede na čas.
Priporočila glede izbire frekvenčnih pasov so podana v dodatku C.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2022
Akustika - Določanje ravni zvočnih moči v zraku, ki jih povzročajo stroji, z
merjenjem vibracij - 2. del: Informativna metoda, ki vključuje določanje ustreznega
faktorja sevanja (ISO/TS 7849-2:2009)
Acoustics - Determination of airborne sound power levels emitted by machinery using
vibration measurement - Part 2: Engineering method including determination of the
adequate radiation factor (ISO/TS 7849-2:2009)
Akustik - Bestimmung der von Maschinen abgestrahlten Luftschallleistungspegel durch
Schwingungsmessung - Teil 2: Verfahren der Genauigkeitsklasse 2 einschließlich
Bestimmung des geeigneten Strahlungsfaktors (ISO/TS 7849-2:2009)
Acoustique - Détermination des niveaux de puissance acoustique aériens émis par les
machines par mesurage des vibrations - Partie 2: Méthode d'expertise incluant la
détermination d'un facteur de rayonnement approprié (ISO/TS 7849-2:2009)
Ta slovenski standard je istoveten z: CEN ISO/TS 7849-2:2022
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
17.160 Vibracije, meritve udarcev in Vibrations, shock and
vibracij vibration measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEN ISO/TS 7849-2
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
February 2022
TECHNISCHE SPEZIFIKATION
ICS 17.140.20
English Version
Acoustics - Determination of airborne sound power levels
emitted by machinery using vibration measurement - Part
2: Engineering method including determination of the
adequate radiation factor (ISO/TS 7849-2:2009)
Acoustique - Détermination des niveaux de puissance Akustik - Bestimmung der von Maschinen
acoustique aériens émis par les machines par abgestrahlten Luftschallleistungspegel durch
mesurage des vibrations - Partie 2: Méthode Schwingungsmessung - Teil 2: Verfahren der
d'expertise incluant la détermination d'un facteur de Genauigkeitsklasse 2 einschließlich Bestimmung des
rayonnement approprié (ISO/TS 7849-2:2009) geeigneten Strahlungsfaktors (ISO/TS 7849-2:2009)
This Technical Specification (CEN/TS) was approved by CEN on 7 February 2022 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.
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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
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COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
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© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TS 7849-2:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO/TS 7849-2:2009 has been prepared by Technical Committee ISO/TC 43 "Acoustics” of
the International Organization for Standardization (ISO) and has been taken over as CEN ISO/TS 7849-
2:2022 by Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to announce this Technical Specification: 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, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO/TS 7849-2:2009 has been approved by CEN as CEN ISO/TS 7849-2:2022 without any
modification.
TECHNICAL ISO/TS
SPECIFICATION 7849-2
First edition
2009-03-15
Acoustics — Determination of airborne
sound power levels emitted by machinery
using vibration measurement —
Part 2:
Engineering method including
determination of the adequate radiation
factor
Acoustique — Détermination des niveaux de puissance acoustique
aériens émis par les machines par mesurage des vibrations —
Partie 2: Méthode d'expertise incluant la détermination d'un facteur
de rayonnement approprié
Reference number
ISO/TS 7849-2:2009(E)
©
ISO 2009
ISO/TS 7849-2:2009(E)
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ISO/TS 7849-2:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Principle. 4
5 Measuring instrumentation. 5
5.1 General. 5
5.2 Vibration transducer. 5
5.3 Non-contacting transducers. 6
5.4 Amplifier and filter . 6
5.5 Integrator . 6
5.6 Calibration . 6
6 Installation and operation of source under test . 7
6.1 General. 7
6.2 Description of the machine. 7
6.3 Installation . 7
6.4 Operating conditions. 7
7 Determination of the vibratory velocity on the vibrating measurement surface . 7
7.1 General. 7
7.2 Vibrating measurement surface . 8
7.3 Number of measurement positions . 8
7.4 Environmental conditions. 9
7.5 Measurement procedure . 9
7.6 Mounting of the vibration transducer. 9
8 Determination of the machinery specific frequency band radiation factor. 10
9 Calculations. 11
9.1 Correction for extraneous vibratory velocity. 11
9.2 Determination of the mean vibratory velocity level on the vibrating measurement surface. 12
9.3 Calculation of the airborne sound power level caused by radiation of structure vibration
generated sound. 13
10 Measurement uncertainty . 13
11 Information to be recorded . 14
11.1 Machine under test . 14
11.2 Measurement conditions . 15
11.3 Measuring instrumentation. 15
11.4 Acoustical data . 15
Annex A (informative) Use of the vibration transducer. 16
Annex B (normative) Procedures for calculating A-weighted sound power levels from octave
band or one-third-octave band levels. 18
Annex C (informative) Recommendations concerning the frequency bands of interest . 20
Annex D (informative) Determination of the vibratory velocity level from the vibratory acceleration
level . 21
Annex E (informative) Guidance on the development of information on measurement uncertainty. 23
Bibliography . 26
ISO/TS 7849-2:2009(E)
Foreword
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(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 bee
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