The omnidirectional acoustic absorber introduced in 2010 by Climente et al.  is an acoustic analogue of the quantum black hole for airborne sound in two dimensions. It consists of a shell, which acts like a gradient index lens, and an absorbing core both made of periodic distributions of cylindrical rods. The energy dissipation of this acoustic black hole is numerically studied using the boundary element method, showing that the dissipation is due to viscothermal losses in the core, which are greatly enhanced due to the surrounding shell. We also concluded that discrepancies with measurements should be attributed to spurious losses existing in the experimental setup, which play a non-negligible role in the measured losses.
|Title of host publication||Proceedings of InterNoise20|
|Editors||Jin Yong Jeon|
|Publisher||Institute of Noise Control Engineering|
|Publication date||23 Aug 2020|
|Publication status||Published - 23 Aug 2020|
|Event||49th International Congress and Exposition on Noise Control Engineering - Virtual event, Seoul, Korea, Republic of|
Duration: 23 Aug 2020 → 26 Aug 2020
|Conference||49th International Congress and Exposition on Noise Control Engineering|
|Country||Korea, Republic of|
|Period||23/08/2020 → 26/08/2020|
|Series||Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020|
Bibliographical notePublisher Copyright:
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