ACOUSTIC ATTENUATION WITH ADAPTIVE IMPEDANCE

摘要

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.

主权项

1. 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.