Acoustic liner

Details Acoustic liner Acoustic liner

1976-04-15

1978-07-18

Franklin, Lawrence R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

F01N 102

Patent

active

041009932

ABSTRACT:
The acoustic treatment for low frequency noise reduction is improved upon in a deep backing cavity lining configuration by providing a depending member or lip at the entrance extending into the cavity defining a space for supporting a column of air for increasing the mass reactance with a resulting decrease in the cavity depth without sacrificing sound attenuation. A slotted construction provides the smallest width of surface opening in the direction of air flow minimizing aerodynamic losses.

REFERENCES:
patent: 2765044 (1956-10-01), Hatte
patent: 3819007 (1974-06-01), Wirt et al.
patent: 3819009 (1974-06-01), Motsinger
patent: 3820628 (1974-06-01), Hanson

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