Acoustic attenuation with adaptive impedance
AssigneeRohr, Inc.
InventorsROBERT L. BRADEN, TERESA M. KRUCKENBERG, VIJAY V. PUJAR, HWA-WAN KWAN
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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.
Claims15
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 coupled to at least one of the core, the perforated top sheet, or the backskin.
A nacelle for an aircraft comprising an acoustic liner configured to attenuate noise, wherein the acoustic liner comprises:
- a core located between a top skin and a backskin;
- and
- a thermoacoustic speaker comprising nanomaterials located within a cell of the core.
Dependencies are inferred from the claim text.