Aeroacoustic Optimization of a Metacage to Block the Noise Emitted by an Exhaust Fan

Auteurs-es

  • Marco Lizotte Venmar Ventilation ULC, CA
  • Jean-Bernard Piaud Independent acoustic and ventilation advisor, CA
  • Raymond Panneton Université de Sherbrooke
  • Tenon Charly Kone National Research Council of Canada, CA
  • Jean-Christophe Cuillière Université du Québec à Trois-Rivières (UQTR), CA
  • Vincent François Université du Québec à Trois-Rivières (UQTR), CA

Résumé

In buildings, HVAC systems are taking care of air quality by exchanging polluted air for fresher one. However, they generate noise pollution disturbing the occupants. The challenge of allowing air to flow freely into the system while preventing noise from exiting is quite significant. Here is presented a solution by using an acoustic cage made of metamaterial, known as a metacage. It is constructed of sonic crystals arranged in a certain pattern which follows Bragg's law to a first approximation. Then, the shape and arrangement of the metacage and its crystals is obtained by computational experiments using Latin Hypercube Sampling (LHS). This makes it possible to create a metamodel with few experiments and find an optimal concept for the case studied, using only Open-Source software. A prototype was manufactured and tested, with and without airflow, on a bathroom fan according to different measurement standards. Comparisons with predictions are good, resulting a noise reduction of 2.3 to 1 sone, which represents 5.5 dB in terms of sound power.

Fichiers supplémentaires

Publié-e

2023-10-09

Comment citer

1.
Lizotte M, Piaud J-B, Panneton R, Kone TC, Cuillière J-C, François V. Aeroacoustic Optimization of a Metacage to Block the Noise Emitted by an Exhaust Fan. Canadian Acoustics [Internet]. 9 oct. 2023 [cité 19 mai 2024];51(3):138-9. Disponible à: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/4071

Numéro

Vol. 51 No. 3 (2023): Actes de la conférence Semaine canadienne de l'acoustique 2023

Rubrique

Actes du congrès de la Semaine canadienne d'acoustique

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