The Edge Absorber as a "Modal Brake"

Research output: Contribution to conferencePaper

Abstract

Nowadays, knowledge about the acoustical influence of edge absorbers (EA) on a sound field is mainly based on empirical experience. Unfortunately, there is no computational model for the EA. Hence, this type of absorber is used hesitantly in the room acoustical design process.

This contribution investigates the absorption behaviour of EAs systematically and proposes an approach for a computational model for EAs in simple room geometries. For the systematically investigations a modular EA was developed and constructed. In the development process optimal parameters for flow resistance, perforation ratio of the absorber housing and layer thickness of the incorporated porous material could be found. Due to the modular principle of the EA flexible assembly is possible.

Different configurations of the modular EA were measured in the reverberation chamber. The acoustical behaviour of the EA was determined in several lecture halls. Equivalent absorption area per unit of length and lower frequency limit of the EA are dependent on the assembly depth and the respective edge of assembly. Moreover, the bandwidth for effective absorption is dependent on the EAs dimensions.

The modular EA was deployed in a room acoustical renovation and pre-post measurements were performed to confirm the vast effect of the EA.
Original languageEnglish
Publication statusPublished - 7 Dec 2020
Evente-Forum Acousticum 2020 - Virtuell, France
Duration: 7 Dec 202011 Dec 2020

Conference

Conferencee-Forum Acousticum 2020
Abbreviated titlee-FA2020
CountryFrance
CityVirtuell
Period7/12/2011/12/20

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