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AS 5333.1:2019
$177.61
Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for small movable sources in reverberant fields, Part 1: Comparison method for a hard-walled test room
The objective of this Standard is to specify methods for determining the sound power level or sound energy level of a noise source by comparing measured sound pressure levels emitted by this source (machinery or equipment) mounted in a hard-walled test room, the characteristics of which are specified, 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 room and size of noise source under test
4.1 Reference box
4.2 Volume of test room and size of noise source under test
4.3 Acoustical properties of test room
4.4 Criterion for acoustic adequacy of test room
4.5 Criterion for background noise
4.6 Ambient temperature and humidity
5 Instrumentation and measurement equipment
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 Installation and mounting conditions
6.5 Operation of source during test
7 Measurement procedure
7.1 General
7.2 Location of noise source under test and reference sound source
7.3 Microphone positions
7.4 Preliminary measurements for sources emitting audible discrete tones or narrow bands of noise
7.5 Measurement of sound pressure levels for a noise source which emits continuous noise
7.6 Measurement of sound pressure levels for a noise source which emits bursts of noise
8 Determination of sound power levels and sound energy levels
8.1 Determination of sound power level
8.1.1 Calculation of measured time-averaged sound pressure levels for multiple source positions
8.1.2 Calculation of mean time-averaged sound pressure levels in the test room
8.1.3 Corrections for background noise
8.1.4 Calculation of sound power level
8.2 Determination of sound energy level
8.2.1 Calculation of the mean of the measured single event time-integrated sound pressure levels for multiple sound emission events and for multiple source positions
8.2.2 Calculation of mean single event time-integrated sound pressure levels in the test room
8.2.3 Corrections for background noise
8.2.4 Sound energy level
8.3 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
9.3.1 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 room
10.4 Instrumentation
10.5 Acoustical data
11 Test report
Annex A
Annex B
B.1 A-weighted sound power levels
B.2 A-weighted sound energy levels
B.3 Values of k and Ck for use in calculations
Annex C
C.1 General
C.2 Considerations on the total standard deviation σtot
