INTERNATIONAL ISO
STANDARD 9614-3
First edition
2002-11-01
Acoustics — Determination of sound power
levels of noise sources using sound
intensity —
Part 3:
Precision method for measurement by
scanning
Acoustique — Détermination par intensimétrie des niveaux de puissance
acoustique émis par les sources de bruit —
Partie 3: Méthode de précision pour mesurage par balayage
Reference number
ISO 9614-3:2002(E)
© ISO 2002
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ISO 9614-3:2002(E)
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Copyright International Organization for Standardization © ISO 2002 – All rights reserved
Provided by IHS under license with ISO
No reproduction or networking permitted without license from IHS Not for Resale
ISO 9614-3:2002(E)
Contents Page
Foreword ..................................................................................................................................................................... v
Introduction................................................................................................................................................................ vi
1 Scope.............................................................................................................................................................. 1
2 Normative references.................................................................................................................................... 1
3 Terms and definitions ................................................................................................................................... 2
4 General requirements ................................................................................................................................... 7
4.1 Size of sound source under test.................................................................................................................. 7
4.2 Character of sound radiated by the source................................................................................................ 7
4.3 Measurement uncertainty............................................................................................................................. 7
5 Acoustic environment................................................................................................................................... 9
5.1 Criteria for adequacy of the test environment ........................................................................................... 9
5.2 Extraneous intensity ..................................................................................................................................... 9
5.3 Wind and gas flows....................................................................................................................................... 9
5.4 Temperature................................................................................................................................................... 9
5.5 Configuration of the surroundings.............................................................................................................. 9
5.6 Atmospheric conditions ............................................................................................................................... 9
6 Instrumentation ........................................................................................................................................... 10
6.1 General ......................................................................................................................................................... 10
6.2 Calibration and field check......................................................................................................................... 10
6.3 Time-series of sound intensity and sound pressure............................................................................... 10
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7 Installation and operation of the source................................................................................................... 10
7.1 General ......................................................................................................................................................... 10
7.2 Operating conditions of the source under test ........................................................................................ 11
8 Measurement of normal sound intensity component levels .................................................................. 11
8.1 Determination of measurement surface ................................................................................................... 11
8.2 Determination of scanning paths and segments ..................................................................................... 11
8.3 Measurements ............................................................................................................................................. 12
8.4 Further actions ............................................................................................................................................ 14
9 Determination of sound power level ......................................................................................................... 15
9.1 Calculation of partial sound powers for each partial surface of the measurement surface ............... 15
9.2 Calculation of normalized sound power level .......................................................................................... 15
10 Information to be recorded......................................................................................................................... 15
Annex A (informative) List of symbols used in this part of ISO 9614 ................................................................. 17
Annex B (normative) Calculation of field indicators ............................................................................................. 19
B.1 General ......................................................................................................................................................... 19
B.2 Definition of field indicators....................................................................................................................... 19
B.2.1 Temporal variability indicator, FT .............................................................................................................. 19
B.2.2 Unsigned pressure-intensity indicator, F p I ......................................................................................... 19
n
B.2.3 Signed pressure-intensity indicator, F pI n .............................................................................................. 20
B.2.4 Field non-uniformity indicator, FS ............................................................................................................. 21
Annex C (normative) Procedure for achieving the desired accuracy ................................................................. 22
C.1 Qualification requirements......................................................................................................................... 22
C.1.1 General ......................................................................................................................................................... 22
© ISO 2002 – All rights reserved
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