SFS-EN ISO 3744:en

Soveltamisala

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ISO 3744:2010 specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping the noise source (machinery or equipment) in an environment that approximates to an acoustic free field near one or more reflecting planes. 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 or with frequency A-weighting applied, is calculated using those measurements.
The methods specified in ISO 3744:2010 are suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001.
ISO 3744:2010 is applicable to all types and sizes of noise source (e.g. stationary or slowly moving plant, installation, machine, component or sub-assembly), provided the conditions for the measurements can be met.
The test environments that are applicable for measurements made in accordance with ISO 3744:2010 can be located indoors or outdoors, with one or more sound-reflecting planes present on or near which the noise source under test is mounted. The ideal environment is a completely open space with no bounding or reflecting surfaces other than the reflecting plane(s) (such as that provided by a qualified hemi-anechoic chamber), but procedures are given for applying corrections (within limits that are specified) in the case of environments that are less than ideal.
Information is given on the uncertainty of the sound power levels and sound energy levels determined in accordance with ISO 3744:2010, for measurements made in limited bands of frequency and with frequency A-weighting applied. The uncertainty conforms to ISO 12001:1996, accuracy grade 2 (engineering grade).

Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).

Sisällysluettelo

Foreword
Introduction
1 Scope

1.1 General
1.2 Types of noise and noise sources
1.3 Test environment
1.4 Measurement uncertainty

2 Normative references
3 Terms and definitions
4 Test environment

4.1 General
4.2 Criteria for background noise
4.3 Criterion for acoustic adequacy of test environment

5 Instrumentation

5.1 General
5.2 Calibration

6 Definition, location, installation, and operation of noise source under test

6.1 General
6.2 Auxiliary equipment
6.3 Noise source location
6.4 Mounting of the noise source
6.5 Installation and mounting conditions for moving noise sources
6.6 Operation of source during test

7 Reference box and measurement surface

7.1 Reference box
7.2 Measurement surface

8 Determination of sound power levels and sound energy levels

8.1 Microphone positions on the measurement surface
8.2 Determination of sound power levels
8.3 Determination of sound energy levels
8.4 Calculation of apparent directivity indices
8.5 Calculation of apparent surface sound pressure level non-uniformity index
8.6 A-weighted sound power level and sound energy level

9 Measurement uncertainty

9.1 Methodology
9.2 Determination of σomc
9.3 Determination of σR0
9.4 Typical upper bound values of σR0
9.5 Total standard deviation σtot and expanded measurement uncertainty U

10 Information to be recorded

10.1 General
10.2 Noise source under test
10.3 Test environment
10.4 Instrumentation
10.5 Acoustical data

11 Test report

Annex A Qualification procedures for the acoustic environment (normative)
Annex B Microphone arrays on a hemispherical measurement surface (normative)
Annex C Microphone arrays on a parallelepiped measurement surface (normative)
Annex D Microphone arrays on a cylindrical measurement surface (informative)
Annex E Calculation of A-weighted sound power levels and A-weighted sound energy levels from frequency band levels (normative)
Annex F Alternative microphone array on a hemispherical measurement surface for direct measurements of A-weighted sound pressure levels (normative)
Annex G Sound power level and sound energy level under reference meteorological conditions (normative)
Annex H Guidelines on the development of information on measurement uncertainty (informative)

Bibliography

Näytä kaikki

Foreword
Introduction
1 Scope

1.1 General
1.2 Types of noise and noise sources
1.3 Test environment
1.4 Measurement uncertainty

2 Normative references
3 Terms and definitions
4 Test environment

4.1 General
4.2 Criteria for background noise
4.3 Criterion for acoustic adequacy of test environment

5 Instrumentation

5.1 General
5.2 Calibration

6 Definition, location, installation, and operation of noise source under test

6.1 General
6.2 Auxiliary equipment
6.3 Noise source location
6.4 Mounting of the noise source
6.5 Installation and mounting conditions for moving noise sources
6.6 Operation of source during test

7 Reference box and measurement surface

7.1 Reference box
7.2 Measurement surface

8 Determination of sound power levels and sound energy levels

8.1 Microphone positions on the measurement surface
8.2 Determination of sound power levels
8.3 Determination of sound energy levels
8.4 Calculation of apparent directivity indices
8.5 Calculation of apparent surface sound pressure level non-uniformity index
8.6 A-weighted sound power level and sound energy level

9 Measurement uncertainty

9.1 Methodology
9.2 Determination of σomc
9.3 Determination of σR0
9.4 Typical upper bound values of σR0
9.5 Total standard deviation σtot and expanded measurement uncertainty U

10 Information to be recorded

10.1 General
10.2 Noise source under test
10.3 Test environment
10.4 Instrumentation
10.5 Acoustical data

11 Test report

Annex A Qualification procedures for the acoustic environment (normative)
Annex B Microphone arrays on a hemispherical measurement surface (normative)
Annex C Microphone arrays on a parallelepiped measurement surface (normative)
Annex D Microphone arrays on a cylindrical measurement surface (informative)
Annex E Calculation of A-weighted sound power levels and A-weighted sound energy levels from frequency band levels (normative)
Annex F Alternative microphone array on a hemispherical measurement surface for direct measurements of A-weighted sound pressure levels (normative)
Annex G Sound power level and sound energy level under reference meteorological conditions (normative)
Annex H Guidelines on the development of information on measurement uncertainty (informative)

Bibliography

Tuoteryhmä(t)

17.140.01 Akustiset mittaukset ja meluntorjunta yleensä »

Sidokset

Velvoittavat viittaukset

IEC 60942:2003
IEC 61260:1995
IEC 61672-1:2002

IEC 60942:2003
IEC 61260:1995
IEC 61672-1:2002
ISO 12001:1996 Acoustics -- Noise emitted by machinery and equipment -- Rules for the drafting and presentation of a noise test code
ISO 3382-2:2008 Acoustics -- Measurement of room acoustic parameters -- Part 2: Reverberation time in ordinary rooms
ISO 3745:2003 Acoustics -- Determination of sound power levels of noise sources using sound pressure -- Precision methods for anechoic and hemi-anechoic rooms
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 1: General principles and definitions
ISO 5725-1:1994/Cor 1:1998
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 5725-2:1994/Cor 1:2002
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 3: Intermediate measures of the precision of a standard measurement method
ISO 5725-3:1994/Cor 1:2001
ISO 5725-4:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 4: Basic methods for the determination of the trueness of a standard measurement method
ISO 5725-5:1998 Accuracy (trueness and precision) of measurement methods and results -- Part 5: Alternative methods for the determination of the precision of a standard measurement method
ISO 5725-5:1998/Cor 1:2005
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results -- Part 6: Use in practice of accuracy values
ISO 5725-6:1994/Cor 1:2001
ISO 6926:1999 Acoustics -- Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
ISO/IEC Guide 98-3:2008 Uncertainty of measurement -- Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)

Tekninen komitea

CEN/TC 211 Acoustics »

Direktiivi

89/392/EEC
98/37/EC Koneturvallisuus
2006/42/EC Koneturvallisuus

http://ec.europa.eu »

Vahvistuspäivä

01.11.2010

Julkaisupäivä

19.11.2010

Painos

3

Sivumäärä

83

Julkaisun kieli

englanti