Aero-acoustic characterization of Helmholtz resonators in the linear regime with system identification

Kilian Forner, Wolfgang Polifke

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

The dissipation of acoustic energy in Helmholtz resonators is investigated by means of large eddy simulation (LES) and system identification. At low sound pressure level, thermo-viscous effects dominate this dissipation. This is linear, i. e., independent of perturbation amplitude. LES/system identification methods are applied in this study to the linear regime. For that purpose, the system is interpreted as a single-input/single-output system of two characteristic waves. An Output-Error model for the reflection coefficient valid for the whole frequency range of interest is estimated from a single LES time series. The resonator admittance and impedance are derived from that model. For a set of test cases, comparison against experimental results and established models shows good agreement for the gain and phase of the admittance as well as of the reactance. The acoustic resistance value is captured with good accuracy close the eigenfrequency of the resonator.

Original languageEnglish
Title of host publication22nd International Congress on Sound and Vibration, ICSV 2015
PublisherInternational Institute of Acoustics and Vibrations
ISBN (Electronic)9788888942483
StatePublished - 2015
Event22nd International Congress on Sound and Vibration, ICSV 2015 - Florence, Italy
Duration: 12 Jul 201516 Jul 2015

Publication series

Name22nd International Congress on Sound and Vibration, ICSV 2015

Conference

Conference22nd International Congress on Sound and Vibration, ICSV 2015
Country/TerritoryItaly
CityFlorence
Period12/07/1516/07/15

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