Anechoic visco-thermal liner
US7469770B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 2006 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Apr 25, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/60
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A liner assembly includes a plurality of aligned passages providing a large open area combined with openings much smaller than a length of the passages. The plurality of passages are disposed parallel with each other and include an opening transverse to incident sound waves. The passages are separated by walls and are blocked at an end distal from the openings. Sound waves incident on a face of the liner enter the passages and are dissipated by viscous losses. Sound energy is further dissipated as thermal energy to the walls of the passages. The long narrow passages provide the desired visco-thermal losses for sound energy in a broad frequency range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.