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NEN-EN-ISO 11691

Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method

inactive
Organization: NEN
Publication Date: 1 September 2009
Status: inactive
Page Count: 22
ICS Code (Acoustics in building. Sound insulation): 91.120.20
scope:

This International Standard specifies a laboratory substitution method to determine the insertion loss without flow of ducted, mainly absorbent, circular and rectangular silencers, as well as other duct elements for use in ventilating and air-conditioning systems. This International Standard is applicable to silencers where the design velocity does not exceed 15 m/s. As the method does not include self-generated flow noise, this International Standard is not suitable for tests on silencers where this type of noise is of great importance for the evaluation of the silencer performance. The insertion loss determined according to this International Standard in a laboratory will not necessarily be the same as the insertion loss that will be obtained in an installation in the field. Different sound and flow fields in the duct will yield different results. As this International Standard requires regular test ducts, the results may include some flanking transmission via structural vibrations in the duct walls, that sets an upper limit to the insertion loss that can be determined.

Document History

December 1, 2020
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method
This document specifies a laboratory substitution method to determine the insertion loss without flow of ducted, mainly absorbent, circular and rectangular silencers, as well as other duct elements...
NEN-EN-ISO 11691
September 1, 2009
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method
This International Standard specifies a laboratory substitution method to determine the insertion loss without flow of ducted, mainly absorbent, circular and rectangular silencers, as well as other...
October 1, 1995
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method
Specifies a laboratory substitution method to determine the insertion loss of ducted circular and rectangular silencers without flow, as well as other duct elements for use in ventilating and...

References

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