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A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA

Pascal, Lucas and Piot, Estelle and Casalis, Grégoire A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA. (2016) Journal of Computational Acoustics, 24 (1). 1663-1674. ISSN 0218-396X

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Official URL: http://dx.doi.org/10.1142/S0218396X15500150

Abstract

The application of wall acoustic lining is a major factor in the reduction of aircraft engine noise. The Extended Helmholtz Resonator impedance model is widely used since it is representative of the behavior of realistic liners over a wide range of frequencies. Its application in time domain CAA methods by means of z-transform has been the subject of several papers. In contrast to standard liner modeling in time domain CAA, which consists in imposing a boundary condition modelling both the cavities and the perforated sheet of the liner, an alternative approach involves adding the cavities to the computational domain and imposing a condition between these cavities and the duct domain to model the resistive sheet. However, the original method may not be used for broadband acoustics since it implements an impedance condition with frequency independent resistance. This paper describes an extension of this method to implement the extended Helmholtz Resonator impedance model in a time domain CAA method.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
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Deposited On:14 Sep 2016 14:52

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