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

SS-EN-ISO-11691 - 2020 EDITION - CURRENT
Show Complete Document History

Document Center Inc. is an authorized dealer of SIS standards.
The following bibliographic material is provided to assist you with your purchasing decision:


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.

To find similar documents by classification:

91.120.20 (Acoustics in building. Sound insulation Acoustic measurements and noise abatement in general, see 17.140.01 Sound insulating materials, see 91.100.60)

91.140.30 (Ventilation and air-conditioning systems Including ventilation ducts Ventilators and air-conditioners, see 23.120)


Revised Machinery Directive

This document comes with our free Notification Service, good for the life of the document.

This document is available in either Paper or PDF format.

ORDER

Price:

$118.95        


Want this as a site license?



Designation Name

SS-EN ISO 11691:2020

Revision Level

2020 EDITION

Status

Current

Publication Date

Dec. 2, 2020

Language(s)

English

Page Count

20

International Equivalent

EN ISO 11691:2020(IDT); ISO 11691:2020(IDT)