A numerical study of a vibro-acoustic metamaterial with an embedded Helmholtz Resonator

Leung, Kenneth and Langfeldt, Felix (2024) A numerical study of a vibro-acoustic metamaterial with an embedded Helmholtz Resonator. In International Conference on Noise and Vibration Engineering (ISMA). Katholieke Universiteit Leuven. 13 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

In the recent decades, acoustic metamaterials are emerging as a lightweight and compact solution to extraordinary low frequency sound insulation. However, many acoustic metamaterials only exhibit superior performance in a narrowband region compared to the mass law of a homogeneous material with equivalent mass, which strongly limits their applications. This paper introduces a multi-modal vibro-acoustic metamaterial that combines structural and acoustical resonances to extend the bandwidth of the metamaterial, using acoustical resonances to improve the performance without affecting the weight of the metamaterial. Firstly, an analytical model is used as a simple approach to understanding the structural and acoustic properties of this metamaterial. Then, numerical simulations based on the finite element method are used to investigate the coupling between the structural and acoustical resonance mechanisms of the metamaterial and their effect on the sound transmission loss of the metamaterial.

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