Low back pressure exhaust silencer for diesel locomotives

Acoustics – Sound-modifying means – Muffler – fluid conducting type

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Details

181251, 181273, 181275, F01N 102, F01N 108

Patent

active

043600751

ABSTRACT:
An exhaust silencer especially for turbo-charged diesel locomotives with a single exhaust outlet combines a straight through exhaust duct preferably diverging to recover velocity pressure and minimize back pressure with dual silencing means including a large expansion tank around the duct tuned to attenuate a fundamental low frequency exhaust noise peak and smaller reactive chambered means in the duct sized to attenuate a selected mid range of higher frequency exhaust noise. Various features are included.

REFERENCES:
patent: 1874326 (1932-08-01), Mason
patent: 3187834 (1965-06-01), Bryson et al.
patent: 3382948 (1968-05-01), Walker et al.
patent: 3503465 (1970-03-01), Kobayashi et al.
patent: 4164266 (1979-08-01), Collin et al.
patent: 4281741 (1981-08-01), Blaser et al.
patent: 4287962 (1981-09-01), Ingard et al.
IAC Bulletin No. 4,1215.0, Industrial Acoustics Co. 1972.

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