• AS 1217.5-1985

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    Acoustics - Determination of sound power levels of noise sources Engineering methods for free-field conditions over a reflecting plane

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Withdrawn date:  06-29-2017

    Language(s): 

    Published date:  12-31-1984

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS 1217.5-1985 ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS OF NOISE SOURCES - ENGINEERING METHODS FOR FREE-FIELD CONDITI
    4 - PREFACE
    5 - CONTENTS
    7 - FOREWORD
    7 - SYNOPSIS
    9 - SECTION 1. SCOPE AND GENERAL
    9 - 1.1 SCOPE.
    9 - 1.2 FIELD OF APPLICATION.
    9 - 1.2.1 Types of noise.
    9 - 1.2.2 Size of source.
    9 - 1.3 REFERENCED DOCUMENTS.
    9 - 1.4 MEASUREMENTUNCERTAINTY.
    10 - 1.5 DEFINITIONS.
    10 - 1.5.1 Free-field
    10 - 1.5.2 Free-field over a reflecting plane
    10 - 1.5.3 Anechoic room
    10 - 1.5.4 Hemi-anechoic room
    10 - 1.5.5 Surface sound pressure
    10 - 1.5.6 Surface sound pressure level
    10 - 1.5.7 Sound power level
    10 - 1.5.8 Frequency range of interest
    10 - 1.5.9 Measurement surface
    10 - 1.5.10 Reference box
    10 - 1.5.11 Measurement distance
    10 - SECTION 2 ACOUSTIC ENVIRONMENT
    10 - 2.1 GENERAL.
    10 - 2.2 CRITERIA FOR ADEQUACY OF THE TEST ENVIRONMENT.
    10 - 2.3 CRITERION FOR BACKGROUND NOISE.
    11 - SECTION 3. INSTRUMENTATION
    11 - 3.1 GENERAL.
    11 - 3.2 THE MICROPHONE AND ITS ASSOCIATED CABLE.
    11 - 3.3 FREQUENCY RESPONSE OF THE INSTRUMENTATION SYSTEM.
    11 - 3.4 WEIGHTING NETWORK, FREQUENCY ANALYSER.
    11 - 3.5 CALIBRATION.
    12 - SECTION 4. INSTALLATION AND OPERATION OF SOURCE
    12 - 4.1 GENERAL.
    12 - 4.2 SOURCE POSITION.
    12 - 4.3 SOURCE MOUNTING.
    12 - 4.4 AUXILIARY EQUIPMENT.
    12 - 4.5 OPERATION OF SOURCE DURING TEST.
    13 - SECTION 5. SOUND PRESSURE LEVELS O N MEASUREMENT SURFACE
    13 - 5.1 MEASUREMENT SURFACE.
    13 - 5.1.1 Reference surface and measurement surface.
    13 - 5.1.2 Coordinate system and definition of distance do.
    13 - 5.1.3 Shape of measurement surface.
    13 - 5.1.4 Selection of measurement surface.
    13 - 5.1.5 Key microphone positions on the hemispherical measurement surface.
    14 - 5.1.6 Key microphone positions on the parallelepiped measurement surface.
    14 - 5.1.7 Key microphone positions on the conformal measurement surface.
    14 - 5.2 ADDITIONAL MICROPHONE POSITIONS ON MEASUREMENT SURFACE.
    14 - 5.2.1 General.
    14 - 5.2.2 Positions of additional microphones.
    14 - 5.2.3 Sufficiency of number of microphone positions.
    14 - 5.2.4 Additional localized microphone positions on measurement surface.
    14 - 5.3 REDUCTION OF NUMBER OF MICROPHONE POSITIONS.
    15 - 5.4 CONDITIONS OF MEASUREMENT.
    15 - 5.4.1 General.
    15 - 5.4.2 Measurements with sound level meter.
    15 - 5.4.3 Measurements with RC-smoothing or integrating systems.
    15 - 5.4.4 Corrections for background noise.
    16 - SECTION 6. CALCULATION OF SURFACE SOUND PRESSURE LEVEL, SOUND POWER LEVEL, AND DIRECTIVITY FACTOR
    16 - 6.1 CALCULATION OF SOUND PRESSURE LEVEL AVERAGED OVER THE MEASUREMENT SURFACE.
    16 - 6.2 CALCULATION OF SURFACE SOUND PRESSURE LEVEL.
    16 - 6.3 CALCULATION OF SOUND POWER LEVEL.
    16 - 6.4 CALCULATION OF DIRECTIVITY INDEX AND DIRECTIVITY FACTOR.
    17 - SECTION 7. INFORMATION TO BE RECORDED
    17 - 7.1 GENERAL.
    17 - 7.2 SOUND SOURCE UNDER TEST.
    17 - 7.3 ACOUSTIC ENVIRONMENT.
    17 - 7.4 INSTRUMENTATION.
    17 - 7.5 ACOUSTICAL DATA.
    17 - 7.6 INFORMATION TO BE REPORTED.
    18 - APPENDIX A - QUALIFICATION PROCEDURES FOR THE ACOUSTIC ENVIRONMENT
    18 - A1 GENERAL.
    18 - A2 ENVIRONMENTAL CONDITIONS.
    18 - A2.1 Properties of reflecting plane.
    19 - A2.2 Precautions for outdoor measurements.
    19 - A3 ABSOLUTE COMPARISON TEST.
    19 - A3.1 Procedure.
    19 - A3.2 Positions of reference sound source in test environment.
    19 - A3.3 Qualification requirements.
    19 - A4 REVERBERATION TEST.
    19 - A4.1 Test procedure.
    20 - A4.2 Qualification requirements.
    21 - APPENDIX B - MICROPHONE ARRAY ON THE HEMISPHERE
    23 - APPENDIX C - MICROPHONE ARRAY ON THE PARALLELE PIPED MEASURING SURFACE
    25 - APPENDIX D - MICROPHONE ARRAY ON THE CONFORMAL MEASUREMENT SURFACE
    28 - APPENDIX E - EXAMPLES OF SUITABLE INSTRUMENTATION SYSTEMS
    28 - E1 GENERAL.
    28 - E2 RC-SMOOTHING, SOUND LEVEL METER.
    28 - E3 ANALOGUE INTEGRATORS.
    28 - E4 DIGITAL SYSTEMS.
    28 - E5 LEVEL RECORDERS.
    29 - APPENDIX F - GUIDELINES FOR THE DETECTION OF IMPULSIVE NOISE
    30 - APPENDIX G - CALCULATION OF DIRECTIVITY INDEX AND DIRECTIVITY FACTOR USING HEMISPHERICAL MICROPHONE ARRAY

    Abstract - (Show below) - (Hide below)

    Sets out engineering methods for measuring the sound pressure levels on a measurement surface enveloping the source and for calculating the sound power level produced by the source. Applies to sources which radiate broad-band noise, narrow-band noise, discrete tones and combinations of such components. Specifies procedures which apply to steady noise and to non-steady noise with the exception of an isolated burst of sound energy or a burst train with a repetition rate less than 10 s.

    Scope - (Show below) - (Hide below)

    This standard sets out engineering methods for measuring the sound pressure levels on a measurement surface enveloping the source and for calculating the sound power level produced by the source. It gives requirements for the test environment and instrumentation as well as techniques for obtaining the surface sound pressure level from which the A-weighted sound power level of the source and octave or one-third octave band sound power levels are calculated.NOTES:1. This standard is concerned with specification of the basic acoustic requirements for the measurement of noise under free-field conditions over a reflecting plane. It is important that specific test codes for various types of equipment be established and used as the basis for measurements according to this standard. Such test codes will, for each type of equipment, give detailed requirements on mounting, loading and operating conditions for the equipment under test as well as descriptions of the measurement surface, the number of microphone positions, and the measurement distance to be used.2. The use of different measurement surfaces may yield differing estimates of the sound power level of a source. Measurements on a given family of equipment should all be based on the same shape of measurement surface. The test method for a particular type of equipment should give detailed information on the particular measurement surface that is selected.

    General Product Information - (Show below) - (Hide below)

    Committee AV-002
    Document Type Standard
    Publisher Standards Australia
    Status Withdrawn
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS Z41-1969 Octave, half octave and one-third octave band pass filters intended for the analysis of sound and vibrations
    AS 1217.4-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for special reverberation test room
    AS 1259-1982 Sound level meters
    AS 1217.3-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for discrete-frequency and narrow-band sources in reverberation rooms
    AS 1217.2-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for broad-band sources in reverberation rooms
    AS 1217.6-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for anechoic and hemi-anechoic rooms
    AS 1633-1985 Acoustics - Glossary of terms and related symbols
    AS 1217.1-1985 Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic Standards for the preparation of noise test codes
    AS 1045-1988 Acoustics - Measurement of sound absorption in a reverberation room
    AS 2533-2002 Acoustics - Preferred frequencies and band centre frequencies

    Standards Referencing This Book - (Show below) - (Hide below)

    AS 3860-1991 Fixed guideway people movers
    AS 2938-1993 Gears - Spur and helical - Guide to specification and rating
    AS 1217.2-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for broad-band sources in reverberation rooms
    AS 2991.2-1991 Acoustics - Method for the determination of airborne noise emitted by household and similar electrical appliances Particular requirements for dishwashers
    AS 3755-1990 Acoustics - Measurement of airborne noise emitted by computer and business equipment
    AS 1217.1-1985 Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic Standards for the preparation of noise test codes
    AS 1055.2-1997 Acoustics - Description and measurement of environmental noise Application to specific situations
    AS 3781-1990 Acoustics - Noise labelling of machinery and equipment
    AS 2362.22-1993 Automatic fire detection and alarm systems - Methods of test for actuating devices - Sound pressure level test
    AS 1217.6-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for anechoic and hemi-anechoic rooms
    AS 2362.22-2002 Fire detection, warning, control and intercom systems - Methods of test - Sound pressure level test
    AS 3200.2.200-1992 Approval and test specification - Medical electrical equipment Particular requirements for safety - Oxygen concentrators for individual patient use
    AS/NZS 3749.1:1997 Intruder alarm systems - Road vehicles - Performance requirements
    AS 2913-2000 Evaporative airconditioning equipment (Reconfirmed 2016)
    AS 3007.3-2004 Electrical installations - Surface mines and associated processing plant - General requirements for equipment and ancillaries
    AS 2991.1-1987 Acoustics - Method for the determination of airborne noise emitted by household and similar electrical appliances General requirements
    AS 1217.7-1985 Acoustics - Determination of sound power levels of noise sources - Survey method
    AS 5102.1-2009 Performance of household electrical appliances - Swimming pool pump-units Energy consumption and performance
    AS 3782.3-1990 Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment Simple (transition) method for stated values for batches of machines
    AS/NZS 3749.1:2003 Intruder alarm systems - Road vehicles Performance requirements
    AS 3782.2-1990 Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment Methods for stated values for individual machines
    AS 2659.1-1988 Guide to the use of sound measuring equipment - Portable sound level meters
    AS 3782.1-1990 Acoustics - Statistical methods for determining and verifying stated noise emission values of machinery and equipment General considerations and definitions
    AS 1217.3-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for discrete-frequency and narrow-band sources in reverberation rooms
    AS 3544-1988 Industrial vacuum cleaners for particulates hazardous to health
    AS 1217.4-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for special reverberation test room
    AS 1081.1-1990 Acoustics - Measurement of airborne noise emitted by rotating electrical machinery Engineering method for free-field conditions over a reflective plane
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