Standard
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AS 5331:2019
[Current]Acoustics — Determination of sound power levels of noise sources — Guidelines for the use of basic standards
The objective of this Standard is to provide guidance for the use of a set of 12 basic International Standards (see Tables 1, 2 and 3) describing various methods for determining sound power levels from all types of machinery, equipment and products.
Published: 08/11/2019
Pages: 35
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Sound power level
4.1 Basic information
4.2 Reasons for the determination of sound power levels
4.3 Basic procedures for determining sound power levels
4.4 Quality of determined sound power levels
4.5 Noise emission declaration
5 Selection of the most appropriate method in the set of standards
5.1 Methods and quantities to be measured and determined
5.2 Considerations affecting the selection of a measurement method
5.3 Test environment
5.4 Selection of basic standards appropriate for measurements in laboratory rooms and special test rooms
5.4.1 General
5.4.2 Acoustical requirements on the sound field in laboratories and special test rooms
5.4.3 Background noise limitation
5.5 Selection of basic standards appropriate for in-situ measurements
5.5.1 General
5.5.2 Hemi-anechoic sound field check
5.6 Determination of high-frequency sound power levels
Annex A
Annex B
B.1 Environments provided by acoustic test laboratories
B.1.1 General
B.1.2 Reverberation test rooms
B.1.3 Special reverberation test rooms
B.1.4 Anechoic and hemi-anechoic test rooms
B.2 Environments in situ
B.2.1 Precision method (accuracy grade 1)
B.2.2 Engineering methods (accuracy grade 2)
B.2.3 Survey methods (accuracy grade 3)
Annex C
C.1 General aspects
C.2 Determination of the expanded measurement uncertainty
Annex D
D.1 General
D.2 Case study 1 — Application of ISO 3744 under free-field (outdoors) conditions — Measurement setup and source
D.3 Case study 2 — Application of ISO 3744 under in situ conditions — Measurement setup and sound source
D.4 Case study 3 — Application of ISO 3746 under in situ conditions — Measurement setup and sound source
Bibliography
Cited references in this standard
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