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  • ISO 3747:2010

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    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

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

    Language(s):  French, English

    Published date:  25-11-2010

    Publisher:  International Organization for Standardization

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    Abstract - (Show below) - (Hide below)

    ISO 3747:2010 specifies 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. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one octave, is calculated using those measurements. The sound power level or sound energy level with frequency A-weighting applied is calculated using the octave-band levels.

    The method specified in ISO 3747:2010 is suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001. The method is primarily applicable to sources which emit broad-band noise. It can, however, also be used for sources which emit narrow-band noise or discrete tones, although there is a possiblity that the measurement reproducibility is then degraded.

    The noise source under test can be a device, machine, component or sub-assembly, especially one which is non-movable.

    The test environment that is applicable for measurements made in accordance with ISO 3747:2010 is a room where the sound pressure level at the microphone positions depends mainly on reflections from the room surfaces. In measurements of ISO 12001:1996, accuracy grade 2 (engineering grade), background noise in the test environment is low compared to that of the noise source or reference sound source.

    Information is given on the uncertainty of the sound power levels and sound energy levels determined in accordance with ISO 3747:2010, for measurements made in octave bands and for A-weighted frequency calculations performed on them. The reproducibility conforms with that of either ISO 12001:1996, accuracy grade 2 (engineering grade) or ISO 12001:1996, accuracy grade 3 (survey grade), depending on the extent to which the requirements concerning the test environment are met.

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    Committee ISO/TC 43/SC 1
    Development Note Supersedes ISO/DIS 3747. (11/2010) Also numbered as ANSI S12.57. (12/2011)
    Document Type Standard
    Publisher International Organization for Standardization
    Status Current
    Supersedes

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

    DIN 45635-1:1984-04 MEASUREMENT OF AIRBORNE NOISE EMITTED BY MACHINES; ENVELOPING SURFACE METHOD; BASIC REQUIREMENTS FOR 3 ACCURACY CLASSES
    ONORM EN ISO 9902-6 : 2014 TEXTILE MACHINERY - NOISE TEST CODE - PART 6: FABRIC MANUFACTURING MACHINERY (ISO 9902-6:2001 + AMD 1:2009 + AMD 2:2014)
    DIN EN ISO 11202:2010-10 Acoustics - Noise emitted by machinery and equipment - Determination of emission sound pressure levels at a work station and at other specified positions applying approximate environmental corrections (ISO 11202:2010)
    DIN EN 23742:1991-11 ACOUSTICS - DETERMINATION OF SOUND POWER LEVELS OF NOISE SOURCES - PRECISION METHODS FOR DISCRETE-FREQUENCY AND NARROW-BAND SOURCES IN REVERBERATION ROOMS
    14/30275192 DC : 0 BS EN ISO 6926 - ACOUSTICS - REQUIREMENTS FOR THE PERFORMANCE AND CALIBRATION OF REFERENCE SOUND SOURCES USED FOR THE DETERMINATION OF SOUND POWER LEVELS
    I.S. EN 16252:2012 MACHINES FOR COMPACTING WASTE MATERIALS OR RECYCLABLE FRACTIONS - HORIZONTAL BALING PRESSES - SAFETY REQUIREMENTS
    BS EN 60349-1 : 2010 ELECTRIC TRACTION - ROTATING ELECTRICAL MACHINES FOR RAIL AND ROAD VEHICLES - PART 1: MACHINES OTHER THAN ELECTRONIC CONVERTOR-FED ALTERNATING CURRENT MOTORS
    18/30369931 DC : 0 BS EN ISO 9902-6 - TEXTILE MACHINERY - NOISE TEST CODE - PART 6: FABRIC MANUFACTURING MACHINERY
    CEI EN 60349-4 : 2014 ELECTRIC TRACTION - ROTATING ELECTRICAL MACHINES FOR RAIL AND ROAD VEHICLES - PART 4: PERMANENT MAGNET SYNCHR