Lined-duct acoustic filter

Details Lined-duct acoustic filter Lined-duct acoustic filter

1980-06-09

1982-08-31

Hix, L. T.

Acoustics

Sound-modifying means

By wave interference

181224, 181252, 181257, F01N 106, F01N 110, F01N 124, E04F 1704

Patent

active

043467814

ABSTRACT:
A lined duct is divided into two parallel branches by means of a rigid partition. The phase speed of the fundamental mode in each branch depends on the liner configuration and can differ markedly from the free-space phase speed. When the liners in the two branches are not the same, the corresponding phase speeds will be different and a relative phase lag between the waves in the two branches results. This, in turn, leads to interference between these wave components (and their reflections) both at the exit and entrance of the parallel branch pair. This interference can be exploited for the purpose of obtaining a low-frequency attenuation which is substantially larger than the attenuation of the unpartitioned duct.

REFERENCES:
patent: 3113635 (1963-12-01), Allen et al.
patent: 3174583 (1965-03-01), Giordano
patent: 3568791 (1971-03-01), Luxton
patent: 3580357 (1971-05-01), Whitney
patent: 3830335 (1974-08-01), Zorumski
patent: 3948349 (1976-04-01), Bychinsky

Affiliated with

Also associated with

Rating

Lined-duct acoustic filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lined-duct acoustic filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lined-duct acoustic filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2180757