Sound absorption with variable acoustic resistance means by osci

Details Sound absorption with variable acoustic resistance means by osci Sound absorption with variable acoustic resistance means by osci

1975-08-01

1976-08-03

Nix, L. T.

Acoustics

Auditorium

244 42CE, E04B 199

Patent

active

039723836

ABSTRACT:
A system for varying the acoustic resistance of an acoustical lining disposed in a duct of an air propulsor comprises a nonlinear sound suppression liner having a porous facing sheet overlying a plurality of cells and means for impinging a predetermined oscillatory air pressure signal of 100-160 dB at an inaudible frequency on the facing sheet to vary the acoustic resistance of the facing sheet to make it optimum for a selected sound level and airflow condition in the duct.

REFERENCES:
patent: 2783008, 02001957
patent: 3294323 (1966-12-01), Ernst
patent: 3596734 (1971-07-01), Yates
patent: 3820628 (1974-06-01), Hanson
"Analytical & Experimental Studies for Predicting Noise Attenuation in Acoustically Treated Ducts for Turbofan Engines"; 1969, E. Feper & L. W. Dean.

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