Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1979-10-01
1981-08-04
Hix, L. T.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
F01N 102
Patent
active
042817412
ABSTRACT:
A compact exhaust silencer especially for use in diesel locomotives having a single exhaust outlet located in relatively close proximity to the roof of the engine hood. The silencer includes an offset duct having dual oppositely curved ninety degree bends, leading to a roof outlet opening and providing broadband high frequency sound level reduction, combined with a compact Helmholtz cavity-type resonator. The resonator consists of a chamber mounted near the first bend in the direction opposite the main duct offset and a connector tube extending from the side of the duct downwardly into the chamber and tuned with the cavity to the sound frequency at which maximum silencing is desired, preferably the predominant firing frequency in the engine noise spectrum at full speed and load.
REFERENCES:
patent: Re25909 (1965-11-01), Ludlow et al.
patent: 3434565 (1967-03-01), Fischer
patent: 3690406 (1972-09-01), Weiss
Blaser Dwight A.
Goding David J.
General Motors Corporation
Hix L. T,.
Outland Robert J.
Tarcza Thomas H.
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