Sound absorption with variable acoustic resistance means

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

1975-07-21

1976-11-16

Hix, L. T.

Acoustics

Auditorium

244 1N, 415119, E04B 199

Patent

active

039918491

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, header means communicating with each of the cells and air pumping means for forcing a predetermined steady flow of air sequentially through the header means, the cells and 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 (1957-04-01), Bodine
patent: 3481427 (1969-12-01), Dobbs et al.
patent: 3527317 (1970-09-01), Motsinger
patent: 3820628 (1974-06-01), Hanson
patent: 3831710 (1974-08-01), Wirt
patent: 3854286 (1974-12-01), Klees
"Analytical & Experimental Studies for Predicting Noise Attenuation in Acoustically Treated Ducts for Turbofan Engines"; E. Feder & L. Dean; Boeing-Prat & Whitney, 1969.

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