A BROADBAND SOUND ABSORPTION RESONATOR MADE OF ACOUSTIC BLACK HOLE

Zacharie LALY; Raymond Panneton; Noureddine Atalla; Sebastian Ghinet; Kevin Verdière

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Complete Paper

Summary

Paper Title

A BROADBAND SOUND ABSORPTION RESONATOR MADE OF ACOUSTIC BLACK HOLE

Authors

Zacharie LALY
Raymond Panneton
Noureddine Atalla
Sebastian Ghinet
Kevin Verdière

Modality

Online Pre-recorded

Subject area

07.0. Aircraft Noise

Publishing Date

25/09/2025

Country of Publishing

Brazil | Brasil

Language of Publishing

en-US

Paper Page

https://www.even3.com.br/anais/international-congress-exposition-noise-control-engineering/1074275-a-broadband-sound-absorption-resonator-made-of-acoustic-black-hole

ISBN

978-65-272-1573-8

Keywords

acoustic resonator, sonic black hole, finite element method, sound absorption coefficient, surface impedance

Summary

In this paper, an acoustic resonator designed for broadband sound absorption is proposed. The resonator features a neck that extends into the cavity, forming a sonic black hole. This design incorporates a central pore profile that decreases linearly across a series of interconnected annular cavities. The radii of the necks connecting these cavities progressively decrease from the inlet, while the resonator’s wall is considered rigid. The finite element method is used to calculate both the sound absorption coefficient and the surface impedance of the proposed resonator. When the neck comprises fifteen annular cavities, the sound absorption coefficient exhibits fifteen different resonant peaks. By reducing the thickness of each annular cavity to approximately 1 millimeter, a broadband sound absorption coefficient is achieved with a surface impedance closely matching that of air. The proposed resonator demonstrates very good performance in noise attenuation across a wide frequency range, making it a promising solution for effective noise insulation in various applications.

Title of the Event: Inter-Noise 2025
City of the Event: São Paulo
Title of the Proceedings of the event: Proceedings of the 54th International Congress and Exposition on Noise Control Engineering
Name of the Publisher: Even3
Means of Dissemination: Meio Digital

How to cite

LALY, Zacharie et al.. A BROADBAND SOUND ABSORPTION RESONATOR MADE OF ACOUSTIC BLACK HOLE.. In: Proceedings of the 54th International Congress and Exposition on Noise Control Engineering. Anais...Sao Paulo(SP) WTC Events Center, 2025. Available in: https//www.even3.com.br/anais/international-congress-exposition-noise-control-engineering/1074275-A-BROADBAND-SOUND-ABSORPTION-RESONATOR-MADE-OF-ACOUSTIC-BLACK-HOLE. Access in: 11/06/2026