Anechoic visco-thermal liner

Details Anechoic visco-thermal liner Anechoic visco-thermal liner

2006-06-29

2008-12-30

San Martin, Edgardo (Department: 2837)

Acoustics

Sound-modifying means

Sound absorbing fence or screen

C181S293000, C181S288000

Reexamination Certificate

active

07469770

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.

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