Patent ID: 8915329

Claim:
A tunable resonant liner device comprising: at least one housing containing at least one chamber with each chamber having at least one initial resonance frequency, wherein each said chamber is formed by an outer wall, a middle portion and an acoustic opening at the end of the chamber opposite to the middle portion, wherein said acoustic opening has at least one orifice formed therein for allowing a sound to transmit through the acoustic opening into said chamber and wherein said housing contains a second, lower chamber which is formed by said middle portion, said outer wall, and a bottom portion, said middle portion is comprised of selectively flexible material operable to transition from a hard state to a soft state upon application of a stimulus, and wherein, upon application of a stimulus, said selectively flexible material transitions to a soft state and changes the dynamic modulus of the selectively flexible material, thereby changing resonance frequency, acoustic attenuation, acoustic impedance, or combinations thereof for the housing.