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Jeffrey Moseamedi
Jeffrey Moseamedi

Iso 3740 Pdf Free 17


ISO 3740:2019 - A Guide to Sound Power Level Determination




Sound power level is a quantity that describes the acoustic energy emitted by a noise source. It is independent of the distance and the environment, and can be used to compare different noise sources or to assess the noise emission of machinery, equipment and products. Sound power level is expressed in decibels (dB) relative to a reference sound power of 1 picowatt (pW).


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ISO 3740:2019 is an international standard that gives guidance for the use of a set of twelve basic standards that describe various methods for determining sound power levels from all types of noise sources. It provides guidance on the selection of one or more of these standards, appropriate to any particular type of sound source, measurement environment and desired accuracy. The guidance given applies to airborne sound.


The Basic Standards for Sound Power Level Determination




The basic standards for sound power level determination are divided into three groups, according to the measurement method and the quantity to be measured and determined. The groups are as follows:



  • Group 1: Methods based on sound pressure measurements in reverberant test rooms or in anechoic rooms.



  • Group 2: Methods based on sound pressure measurements on a measurement surface enveloping a noise source.



  • Group 3: Methods based on sound intensity measurements.




The following table summarizes the basic standards in each group, along with their main characteristics and applications.




Group


Standard


Title


Measurement quantity


Determination quantity


Application




1


[ISO 3741]


Precision method for determination of sound power levels of noise sources using sound pressure Engineering method in an essentially free field over a reflecting plane


Sound pressure level in an anechoic room


Sound power level


Noise sources with high directivity or low-frequency content




[ISO 3743-1]


Determination of sound power 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


Sound pressure level in a reverberant room with a reference sound source


Sound power level


Small, movable noise sources in hard-walled reverberant rooms




[ISO 3743-2]


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


Sound pressure level in a special reverberant room with or without a reference sound source


Sound power level


Small, movable noise sources in special reverberant rooms with specific characteristics



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