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  • BS EN ISO 9614-3:2009

    Current The latest, up-to-date edition.

    Acoustics. Determination of sound power levels of noise sources using sound intensity Precision method for measurement by scanning

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  30-04-2010

    Publisher:  British Standards Institution

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

    Foreword
    Introduction
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 General requirements
    5 Acoustic environment
    6 Instrumentation
    7 Installation and operation of the source
    8 Measurement of normal sound intensity component levels
    9 Determination of sound power level
    10 Information to be recorded
    Annex A (informative) - List of symbols used in this
            part of ISO 9614
    Annex B (normative) - Calculation of field indicators
    Annex C (normative) - Procedure for achieving the desired
            accuracy
    Annex D (informative) - Effects of airflow on measurement
            of sound intensity
    Annex E (informative) - Effect of sound absorption within
            the measurement surface
    Annex F (informative) - Measurement surface and scanning
            procedure
    Annex G (informative) - Procedure for obtaining time-averaged
            intensities and squared pressures from a sequence of
            short-time averaged intensities and squared pressures
    Annex H (informative) - Normalization of sound power level
    Annex I (informative) - Field indicators used in
            ISO 9614-1, -2 and -3
    Bibliography
    Annex ZA (informative) - Relationship between this European
             Standard and the Essential Requirements of EU
             Directive 98/37/EC
    Annex ZB (informative) - Relationship between this European
             Standard and the Essential Requirements of EU
             Directive 2006/42/EC

    Abstract - (Show below) - (Hide below)

    Describes a method for measuring the component of sound intensity normal to a measurement surface which is chosen so as to enclose the sound source(s) of which the sound power level is to be determined.

    Scope - (Show below) - (Hide below)

    1.1 This part of ISO 9614 specifies a method for measuring the component of sound intensity normal to a measurement surface which is chosen so as to enclose the sound source(s) of which the sound power level is to be determined.

    Surface integration of the intensity component normal to the measurement surface is approximated by subdividing the measurement surface into contiguous partial surfaces, and scanning the intensity probe over each partial surface along a continuous path which covers the extent of the partial surface. The measurement instrument determines the averaged normal intensity component and averaged squared sound pressure over the duration of each scan. The scanning operation can be performed either manually or by means of a mechanical system.

    The octave band or band-limited weighted sound power level is calculated from the measured one-third-octaveband values. The method is applicable to any source for which a physically stationary measurement surface can be defined, and on which the sound generated by the source under test and by other significant extraneous sources are stationary in time. The source is defined by the choice of measurement surface. The method is applicable in specific test environments fulfilling all relevant requirements of this part of ISO 9614.

    This part of ISO 9614 specifies certain ancillary procedures, described in annex C, to be followed in conjunction with the sound power determination. The results are used to indicate the quality of the determination, and hence the grade of accuracy. If the quality of the determination does not meet the requirements of this part of ISO 9614, the test procedure shall be modified in the manner indicated.

    This part of ISO 9614 is not applicable to any frequency band in which the sound power of the source is found to be negative on measurement.

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

    Committee EH/1/4
    Development Note Supersedes 00/562493 DC (12/2002)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

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

    ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
    ISO 12001:1996 Acoustics Noise emitted by machinery and equipment Rules for the drafting and presentation of a noise test code
    ISO 3744:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering methods for an essentially free field over a reflecting plane
    ISO 3743-2:1994 Acoustics Determination of sound power levels of noise sources using sound pressure Engineering methods for small, movable sources in reverberant fields Part 2: Methods for special reverberation test rooms
    ISO 7574-4:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 4: Methods for stated values for batches of machines
    ISO 9614-1:1993 Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1: Measurement at discrete points
    IEC 60942:2003 Electroacoustics - Sound calibrators
    IEC 61043:1993 Electroacoustics - Instruments for the measurement of sound intensity - Measurements with pairs of pressure sensing microphones
    ISO 3747:2010 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
    ISO 3740:2000 Acoustics Determination of sound power levels of noise sources Guidelines for the use of basic standards
    ISO 9614-2:1996 Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 2: Measurement by scanning
    ISO 7574-1:1985 Acoustics — Statistical methods for determining and verifying stated noise emission values of machinery and equipment — Part 1: General considerations and definitions
    ISO 3746:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane
    ISO/TR 7849:1987 Acoustics Estimation of airborne noise emitted by machinery using vibration measurement
    ISO 3741:2010 Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for reverberation test rooms
    ISO 3745:2012 Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Precision methods for anechoic rooms and hemi-anechoic rooms
    1998/37/EC : 1998 DIRECTIVE 98/37/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL OF 22 JUNE 1998 ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES RELATING TO MACHINERY
    IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters
    IEC 60651:1979+AMD1:1993+AMD2:2000 CSV Sound level meters
    ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
    ISO 3743-1:2010 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
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