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Norm

ÖNORM EN ISO 11691

Issue date: 1996 05 01

Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995)

This International Standard specifies a laboratory substitution method to determine the insertion loss without flow of ducted, mainly absorbent, circular and rectangular...
Withdrawn: 2010 01 01
§ Legal References
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. NOTE 1 Laboratory measurement procedures for ducted silencers with superimposed flow are described in IS0 7235. 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. NOTE 2 IS0 7235 gives methods for determining this limit. This International Standard is intended to be used for circular silencers with diameters of 80 mm to 2 000 mm or rectangular silencers with crosssectional areas within the same range.
ÖNORM EN ISO 11691
2021 03 01
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey metho...
Norm
ÖNORM EN ISO 11691
2010 01 01
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey metho...
Norm
ÖNORM EN ISO 11691
1996 05 01
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey metho...
Norm
Norm
ISO 3741:1988
Issue date : 1988 12 15
Acoustics — Determination of sound power levels of noise sources — Precision methods for broad-band sources in reverberation rooms
Norm
ISO 3743-1:1994
Issue date : 1994 02 17
Acoustics — Determination of sound power levels of noise sources — Engineering methods for small, movable sources in reverberant fields — Part 1: Comparison method for hard-walled test rooms
Norm
ISO 3744:1994
Issue date : 1994 05 05
Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering method in an essentially free field over a reflecting plane
Norm
ISO 7235:1991
Issue date : 1991 04 11
Acoustics — Measurement procedures for ducted silencers — Insertion loss, flow noise and total pressure loss
Norm
ISO 9614-1:1993
Issue date : 1993 06 03
Acoustics — Determination of sound power levels of noise sources using sound intensity — Part 1: Measurement at discrete points
Norm
ÖNORM EN ISO 11691
Issue date : 2010 01 01
Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:1995)
Norm
ISO 11691:1995
Issue date : 1995 08 03
Acoustics — Measurement of insertion loss of ducted silencers without flow — Laboratory survey method (Corrected version 1995-12)