Standard
Track updates
AS 5337:2019
[Current]The objective of this Standard is to specify methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping a noise source (machinery or equipment) in a test environment for which requirements are given.
Published: 08/05/2019
Pages: 48
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
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 Criterion 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
6.4.1 General
6.4.2 Hand-held machinery and equipment
6.4.3 Base-mounted, wall-mounted and tabletop machinery and equipment
6.5 Operation of source during test
7 Reference box and measurement surface
7.1 Reference box
7.2 Measurement surface
7.2.1 General
7.2.2 Microphone orientation
7.2.3 Hemispherical measurement surface
7.2.4 Parallelepiped measurement surface
8 Determination of sound power levels and sound energy levels
8.1 Determination of environmental correction
8.2 Microphone positions on the measurement surface
8.2.1 Hemispherical measurement surface
8.2.2 Parallelepiped measurement surface
8.2.3 Reduction in the number of microphone positions
8.3 Determination of sound power levels
8.3.1 Measurement of sound pressure levels
8.3.2 Calculation of mean time-averaged sound pressure levels
8.3.3 Corrections for background noise
8.3.4 Calculation of surface time-averaged sound pressure level
8.3.5 Calculation of sound power levels
8.4 Determination of sound energy levels
8.4.1 Measurement of single event time-integrated sound pressure levels
8.4.2 Corrections for background noise
8.4.3 Calculation of surface single event time-integrated sound pressure levels
8.4.4 Calculation of sound energy levels
9 Measurement uncertainty
9.1 Methodology
9.2 Determination of σomc
9.3 Determination of σR0
9.3.1 General
9.3.2 Round robin test
9.3.3 Modelling approach for 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
Annex B
B.1 Key microphone positions and additional microphone positions
B.2 Microphone positions for sources adjacent to two reflecting planes
B.3 Microphone positions for sources adjacent to three reflecting planes
Annex C
C.1 Microphone positions for sources mounted on one reflecting plane
C.2 Microphone positions for sources adjacent to two or three reflecting planes
Annex D
D.1 General
D.2 Considerations on the total standard deviation σtot
D.3 Considerations on σomc
D.4 Considerations on σR0
D.4.1 General
D.4.2 Contributions to the uncertainty σR0
D.4.2.1 General
D.4.2.2 Measurement method
D.4.2.3 Sound pressure measurement repeatability
D.4.2.4 Measurement surface area
D.4.2.5 Background noise correction
D.4.2.6 Environmental reflections
D.4.2.7 Meteorological corrections
D.4.2.8 Sound level meter
D.4.2.9 Sampling
D.4.2.10 Angle
D.4.2.11 Spectral shape
D.4.2.12 Typical value for σR0
D.5 Combined standard uncertainty
D.6 Measurement uncertainty based on reproducibility data
Bibliography
Cited references in this standard
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