Acoustic attenuation with adaptive impedance
AssigneeRohr, Inc.
InventorsRobert L. Braden, Teresa M. Kruckenberg, Vijay V. Pujar, Hwa-Wan Kwan
Life of this patent
Estimating the term…
Abstract
An acoustic liner may include a core with a plurality of resonator chambers, a perforated top sheet coupled to the core, and a backskin coupled to the core. A thermoacoustic speaker including nanomaterials may be coupled to at least one of the core, the backskin, and the perforated top sheet. A voltage may be applied to the thermoacoustic speaker. The thermoacoustic carbon nanotube speaker may create a dynamic excitation within a resonator chamber in the core. The dynamic excitation may change the liner acoustic impedance to achieve optimum noise attenuation over a wide range of frequencies or engine operating conditions.
Claims13
An acoustic liner comprising:
- a core comprising a resonator chamber;
- a perforated top sheet coupled to the core;
- a backskin coupled to the core;
- and
- a thermoacoustic speaker comprising nanomaterials, wherein the thermoacoustic speaker is coupled to, the perforated top sheet, wherein the thermoacoustic speaker comprises a plurality of perforations corresponding to the perforated top sheet.
A nacelle for an aircraft comprising an acoustic liner configured to attenuate noise, wherein the acoustic liner comprises:
- a core located between a perforated top skin and a backskin;
- and
- a thermoacoustic speaker comprising nanomaterials located within a cell of the core,
- wherein the thermoacoustic speaker is coupled to the top skin, and
- wherein the thermoacoustic speaker comprises a plurality of perforations corresponding to the perforated top skin.
Dependencies are inferred from the claim text.