Optimization of an absorbing surface with 2D Helmholtz resonators for reduced sensitivity to the incidence angle

Diana Maria Garza Agudelo, Vicente Cutanda Henriquez, Cheol-Ho Jeong, Peter Risby Andersen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

It has been shown in several recent publications that acoustic materials consisting of periodic arrangements of resonators can render high absorption coefficient values while maintaining compactness. This makes them attractive solutions for applications in which low frequency sound control is needed, and/or when there are significant space constraints. Nevertheless, the acoustic performance of these surfaces varies with the angle at which a wave impinges on the surface, and there are several applications for which a consistent angle-dependent behaviour is beneficial. Density-based topology optimization is a tool that can help realize designs with a large degree of geometrical freedom. Using this framework we have designed a structure that reduces the sensitivity
of the performance of a periodic array of a 2D Helmholtz resonator to changes in the incidence angle. By combining different geometrical features, the optimized structure can extend the range of angles for which absorption coefficient values above 0.95 can be achieved, which spans from 0 to 47.5 for the initial surface, to the range from 0 to 60◦.
Original languageEnglish
Title of host publicationProceedings of Inter-noise 2021
Number of pages12
Publication date2021
Publication statusPublished - 2021
Event50th International Congress and Exposition on Noise Control Engineering - Virtual congress, Washington, United States
Duration: 1 Aug 20215 Aug 2021

Conference

Conference50th International Congress and Exposition on Noise Control Engineering
LocationVirtual congress
Country/TerritoryUnited States
CityWashington
Period01/08/202105/08/2021

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