Sparse acoustic absorber
US11043199B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2018 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | Oct 18, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K11/162
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A sparse acoustic absorber includes a periodic array of spaced apart unit cells, generally having a lateral fill factor less than 0.5. Each unit cell includes a pair of joined, and inverted, Helmholtz resonators, having neck portions that point in opposite directions. This structure enables ambient fluid, such as air, to pass through the absorber. The absorber predominantly absorbs acoustic waves having a resonant frequency when such waves are incident on the absorber in one direction, and predominantly reflect such waves when they are incident on the absorber in the opposite direction. Dual-function sound suppression systems incorporate such an absorber into a porous substrate, such as a wire mesh, that enables fluid to pass and alternatively absorbs or reflects sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.