A new Helmholtz-based Resonator Effective Over a Wide Frequency Band using a Flexible Panel

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  • 弾性板の振動を利用した広帯域ヘルムホルツ共鳴器型吸音パネル
  • ダンセイバン ノ シンドウ オ リヨウ シタ コウタイイキ ヘルムホルツ キョウメイキガタ キュウオン パネル

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Abstract

For the purpose of enhancing the control effect of a conventional Helmholtz resonator for absorbing incident sound in a wide frequency range, this paper presents a newly developed Helmholtz-based resonator. The principle of the resonator presented in the work is relied upon the frequency property of a flexible panel installed in a resonator cavity, thereby enabling to broaden the effective frequency range of the sound absorption. The resonance frequency of the panel is designed to tune to that of the resonator, so that the resonant peak is split into two. Thus the absorption of sound characterized by the resonant peaks becomes effective over a wide frequency band. A mathematical model of the resonator presented is shown, the description of the resonator system being performed. Furthermore, an absorption coefficient as well as acoustic impedance density of the resonator is derived analytically. Then, from a viewpoint of a numerical simulation, fundamental characteristics of the resonator system with those parameters are investigated, and the influence of the loss factor and density of the attached panel on the sound absorption is discussed. Finally, an experiment is conducted, demonstrating the validity of the proposed resonator.

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