Methods for designing a chamber to reduce noise in a duct

Details Methods for designing a chamber to reduce noise in a duct Methods for designing a chamber to reduce noise in a duct

2006-01-17

2006-01-17

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Measured signal processing

C702S069000, C702S111000, C702S190000, C181S249000, C181S255000, C181S269000

Reexamination Certificate

active

06988057

ABSTRACT:
Low-frequency duct noise is relatively difficult to deal with by passive methods such as porous duct lining. Reactive methods like expansion chamber are rather bulky, while compact resonators are to narrow-banded. This invention shows that a suitably stetched thin membrane backed by a slender cavity can achieve a satisfactory performance from low to medium frequencies over an octave band.

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