Acoustics – Auditorium
Patent
1974-07-03
1976-05-11
Gonzales, John F.
Acoustics
Auditorium
29157R, 181 35C, 181 48, F01N 104
Patent
active
039556433
ABSTRACT:
An improved sound attenuating device characterized by several novel structures which include (1) a foraminous conduit covered by (2) a layer of sound absorbing material of increasing static flow resistance from the inlet end to the outlet end, and (3) a housing surrounding the conduit and defining a plurality of quarter-wave standing wave cavities in series after the inlet end in operative association with the covered conduit. The present structure provides an attenuating device having a continually changing flow resistance to match the decreasing sound pressure level of the fluid flow passing through the attenuator. The structure takes advantage of the interaction that exists between the sound pressure level and changes in the static and dynamic flow resistance, such that for decreasing sound pressure levels, the dynamic flow resistance will be maintained at an optimum for the system by increasing the static flow resistance.
REFERENCES:
patent: 1811762 (1931-06-01), Schnell
patent: 2043731 (1936-06-01), Bourne
patent: 2326612 (1943-08-01), Bourne
patent: 3231520 (1966-01-01), Leak
patent: 3502171 (1970-03-01), Cowan
patent: 3734234 (1973-05-01), Wirt
patent: 3791483 (1974-02-01), Vasiljevic
Brunswick Corporation
Epstein S. L.
Gonzales John F.
Heimovics J. G.
Olexa D. S.
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