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Enhanced resonance of sparse arrays of Helmholtz resonators-Application to perfect absorption
A Maurel1, J-F Mercier2, K Pham3
1Institut Langevin, Centre National de la Recherche Scientifique, École Supérieure de Physique et de Chimie Industrielles ParisTech, 1 rue Jussieu, 75005 Paris, France.
Abstract:
The influence of the spacing on the resonance of a periodic arrangement of Helmholtz resonators is inspected. An effective problem is used which accurately captures the properties of the resonant array within a large range of frequencies, and whose simplified version leaves an impedance condition. It is shown that the strength of the resonance is enhanced when the array becomes sparser. This degree of freedom on the radiative damping is of particular interest since it does not affect the resonance frequency nor the damping due to losses within each resonator; in addition, it does not affect the total thickness of the array. It is shown that it can be used for the design of a perfect absorbing wall.
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