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AS 5339:2019
$213.50
Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering/survey methods for use in situ in a reverberant environment
The objective of this Standard is to specify a method for determining the sound power level or sound energy level of a noise source by comparing measured sound pressure levels emitted by a noise source (machinery or equipment) mounted in situ in a reverberant environment, with those from a calibrated reference sound source.
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 Criterion for acoustic adequacy of test environment
4.2 Criterion for background noise
5 Instrumentation and measurement equipment
5.1 General
5.2 Calibration
6 Location, installation and operation of noise source under test
6.1 Source location and installation
6.2 Auxiliary equipment
6.3 Operation of source during test
7 Measurement procedure
7.1 General
7.2 Characterization of noise source under test
7.3 Locations of the reference sound source
7.3.1 General
7.3.2 One location
7.3.3 More than one location
7.4 Microphone positions
7.4.1 General
7.4.2 Zoning
7.4.3 Selection of microphone positions
7.5 Measurement of sound pressure levels for a noise source which emits steady or non-steady noise
7.6 Measurement of sound pressure levels for a noise source which emits impulsive noise
8 Calculation of sound power levels and sound energy levels
8.1 Corrections for background noise
8.2 Mean time-averaged sound pressure levels for a noise source which emits steady or non-steady noise
8.3 Sound power levels
8.3.1 One location of reference sound source
8.3.2 Several locations of reference sound source
8.4 Mean single event sound pressure level for a noise source which emits impulsive noise
8.5 Sound energy levels
8.5.1 One location of reference sound source
8.5.2 Several locations of reference sound source
8.6 A-weighted sound power level and A-weighted sound energy level
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 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 Acoustic data
11 Test report
Annex A
Annex B
B.1 General
B.2 Recommendation 1
B.3 Recommendation 2
B.4 Recommendation 3
B.5 Recommendation 4
Annex C
Annex D
D.1 A-weighted sound power levels
D.2 A-weighted sound energy levels
D.3 Values of k and Ck for use in calculations
Annex E
E.1 General
E.2 Considerations on the total standard deviation, σtot
