Standard
Track updates
AS 5332:2019
[Current]Acoustics — Determination of sound power levels of noise sources — Guidelines for the use of basic standards
The objective of this Standard is to specify methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured in a reverberation test room.
Published: 06/06/2019
Pages: 62
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 Reverberation test room
1.4 Measurement uncertainty
2 Normative references
3 Terms and definitions
4 Reference meteorological conditions
5 Reverberation test room
5.1 General
5.2 Volume and shape of test room
5.3 Sound absorption of test room
5.4 Criteria for background noise
5.4.1 Relative criteria for background noise
5.4.1.1 General
5.4.1.2 Relative background noise criteria for frequency band measurements
5.4.1.3 Relative background noise criteria for A-weighted measurements
5.4.2 Absolute criteria for background noise
5.4.3 Statement of non-conformity with background noise criteria
5.5 Atmospheric temperature, humidity and pressure
6 Instrumentation and measurement equipment
6.1 General
6.2 Calibration
7 Definition, location, installation, and operation of noise source under test
7.1 General
7.2 Auxiliary equipment
7.3 Noise source location
7.4 Installation and mounting conditions
7.5 Operation of source during test
8 Measurements in the reverberation test room
8.1 General
8.2 Initial location of the noise source under test
8.3 Microphone positions
8.4 Measurement of sound pressure levels
8.4.1 General
8.4.2 Further evaluation in a test room that is not qualified for the measurement of discrete-frequency components (see Annex D)
8.4.2.1 General
8.4.2.2 Determination of standard deviations from preliminary measurements
8.4.2.3 Number of microphone positions to be used
8.4.2.4 Evaluation of need for additional noise source positions
8.4.2.5 Measurements to be used for determining sound power levels
8.5 Measurement of single event time-integrated sound pressure levels
8.5.1 General
8.5.2 Further evaluation in a test room that is not qualified for the measurement of discrete-frequency components (see Annex D)
8.5.2.1 General
8.5.2.2 Measurements to be used for determining sound energy levels
8.6 Measurement of sound pressure levels from the reference sound source for the comparison method
8.6.1 Location of the reference sound source
8.6.2 Sound pressure levels from the reference sound source
8.7 Measurement of reverberation time
8.8 Measurement of meteorological conditions
9 Determination of sound power levels and sound energy levels
9.1 Determination of sound power levels
9.1.1 Calculation of measured time-averaged sound pressure levels for multiple source positions
9.1.2 Corrections for background noise
9.1.3 Calculation of mean time-averaged sound pressure levels in the test room
9.1.4 Calculation of sound power levels using the equivalent absorption area of the room (direct method)
9.1.5 Calculation of sound power levels using the reference sound source (comparison method)
9.2 Determination of sound energy levels
9.2.1 Calculation of the mean of the measured single event time-integrated sound pressure levels for multiple sound emission events and for multiple source positions
9.2.2 Corrections for background noise
9.2.3 Calculation of mean single event time-integrated sound pressure levels in the test room
9.2.4 Calculation of sound energy levels using the equivalent absorption area of the room (direct method)
9.2.5 Calculation of sound energy levels using the reference sound source (comparison method)
9.3 A-weighted sound power level and sound energy level
10 Measurement uncertainty
10.1 Methodology
10.2 Determination of σomc
10.3 Determination of σR0
10.3.1 General
10.3.2 Round robin test
10.3.3 Modelling approach for σR0
10.4 Typical upper bound values of σR0
10.5 Total standard deviation σtot and expanded measurement uncertainty, U
11 Information to be recorded
11.1 General
11.2 Noise source under test
11.3 Test environment
11.4 Instrumentation
11.5 Acoustical data
12 Test report
Annex A
A.1 General
A.2 Volume of reverberation test room
A.3 Shape of reverberation test room
A.4 Absorption of reverberation test room
Annex B
Annex C
C.1 Introduction
C.2 Instrumentation and equipment
C.3 Test procedure
C.4 Calculation
C.5 Qualification
Annex D
D.1 Introduction
D.2 General
D.3 Instrumentation and measurement equipment
D.4 Loudspeaker test
D.5 Room test
D.6 Computational procedure
D.7 Qualification
D.8 Multiple source locations
Annex E
E.1 Additional frequency range
E.2 Supplement to Table 6
E.3 Supplement to Table 1 (Minimum volume of the reverberation test room as a function of the lowest frequency band of interest)
E.4 Supplement to Table 4 (Minimum number of microphone positions for the measurement of sound pressure level) and Table 5 (Minimum number of source locations for the measurement of sound pressure level)
E.5 Supplement to Table C.1
E.6 Supplement to Tables D.1 and D.2
Annex F
F.1 Sound power levels
F.1.1 Octave band levels
F.1.2 A-weighted level
F.1.3 Unweighted level
F.2 Sound energy levels
F.2.1 Octave band levels
F.2.2 A-weighted level
F.2.3 Unweighted level
F.3 Values of k and Ckfor use in calculations
Annex G
G.1 General
G.2 Considerations on the total standard deviation σtot
G.3 Considerations on σomc
G.4 Considerations on σR0
G.4.1 General
G.4.2 Contributions to the uncertainty σR0
G.4.2.1 General
G.4.3 Direct method
G.4.3.1 General
G.4.3.2 Measurement method, δmethod
G.4.3.3 Sound pressure level repeatability, Lp(ST)′¯
G.4.3.4 Background noise correction, K1
G.4.3.5 Room volume to surface area ratio, V/S
G.4.3.6 Room volume, V
G.4.3.7 Reverberation time, T60
G.4.3.8 Temperature, θ
G.4.3.9 Static pressure, ps
G.4.3.10 Sound level meter, δslm
G.4.3.11 Relative humidity, δH
G.4.3.12 Typical value for σR0
G.4.4 Comparison method
G.5 Combined standard uncertainty
G.6 Measurement uncertainty based on reproducibility data
Bibliography
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