Standard Svensk standard · SS-EN ISO 11691:2020

Akustik - Mätning utan luftflöde av insättningsdämpning hos kanalljuddämpare - Översiktsmetod för laboratorier (ISO 11691:2020)

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Standard Svensk standard · SS-EN ISO 11691:2020

Akustik - Mätning utan luftflöde av insättningsdämpning hos kanalljuddämpare - Översiktsmetod för laboratorier (ISO 11691:2020)
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Omfattning
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 for use in ventilating and air-conditioning systems.
NOTE Laboratory measurement procedures for ducted silencers with superimposed flow are described in ISO 7235[5].
This document 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 document is not suitable for tests on silencers where this type of noise is of great importance for the evaluation of the silencer performance. As most silencers, particularly in offices and dwelling, have design velocities below 15 m/s, this document can often be a cost-efficient alternative to ISO 7235[5].
The insertion loss determined according to this document in a laboratory is not necessarily the same as the insertion loss obtained in an installation in the field. Different sound and flow fields in the duct yield different results. In this document, the sound field is dominated by plane wave modes. Due to the use of regular test ducts, the results can include some flanking transmission via structural vibrations in the duct walls that sets an upper limit to the insertion loss that can be determined.
This document is intended to be used for circular silencers with diameters of 80 mm to 2 000 mm or for rectangular silencers with cross-sectional areas within the same range.

Ämnesområden

Buller och mätmetod (14.020) Akustik i byggnader, ljudisolering. (91.120.20) Ventilation och luftkonditionering (91.140.30)


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Standard Svensk standard · SS-EN ISO 11691:2020

Akustik - Mätning utan luftflöde av insättningsdämpning hos kanalljuddämpare - Översiktsmetod för laboratorier (ISO 11691:2020)
Prenumerera på standarden - Läs mer Dölj
Pris: 875 SEK
standard ikon pdf

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Pris: 875 SEK
standard ikon

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Pris: 1 400 SEK
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Produktinformation

Språk: Engelska

Framtagen av: Akustik och buller, SIS/TK 110

Internationell titel: Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method (ISO 11691:2020)

Artikelnummer: STD-80026424

Utgåva: 3

Fastställd: 2020-12-02

Antal sidor: 20

Ersätter: SS-EN ISO 11691:2009