Membrane acoustic absorber
US11626094B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2020 |
| Grant date | Apr 11, 2023 |
| Priority date | — |
| Expiry date | Feb 11, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K11/168
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A membrane-type acoustic absorber structure is provided for an acoustic panel. The absorber structure includes an acoustic substrate. A plurality of spaced apart unit cells are provided in the acoustic substrate and arranged in a periodic array. Each unit cell includes at least one perimeter boundary wall and a bottom wall portion. The perimeter boundary wall and bottom wall portion cooperate to define a chamber with an opening and a chamber cavity having a chamber volume. An elastic membrane is disposed at the chamber opening and configured for sealing the chamber cavity. At least one lossy porous medium is provided aligned with, and separated a distance from, the elastic membrane. A fluid/gas is provided in the chamber volume. In certain aspects, the unit cells may have identical dimensions, having the same resonance frequency. In other aspects, the unit cells may have different dimensions, providing a broadband absorber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.