Sound attenuation apparatus and method
US9587563B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2015 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | Sep 12, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2250/283
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An aircraft auxiliary power unit sound attenuation apparatus includes a perforated body having a center aperture through which exhaust fluid passes, a backing member outwardly offset from the perforated body, a plurality of connecting members coupling the perforated body to the backing member to form a locally reacting sound attenuation member having a plurality of channels spanning outwardly from the perforated body to the backing member, and a bulk absorber disposed in each of the plurality of channels where the bulk absorber is in fluid communication with the exhaust fluid, where the locally reacting sound attenuation member is in fluid communication with an auxiliary power unit of an aircraft so that the plurality of channels are oriented in a direction crossing a pressure drop direction of an exhaust fluid flow passing through the center aperture and each channel circumscribes the center aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.