Method and apparatus for reducing aerodynamic whistle

Details Method and apparatus for reducing aerodynamic whistle Method and apparatus for reducing aerodynamic whistle

1975-02-27

1977-05-17

Schaefer, Robert K.

Acoustics

Auditorium

181 35C, 181 59, F01N 100

Patent

active

040236455

ABSTRACT:
Means and methods for prevention of undesirable acoustical whistles in mufflers or silencers of inexpensive and convenient design are shown. The broad inventive concept is that of preventing extended smooth flow of gas within a perforated tube, and this is taught by regular or random beading, by internal banding, or by provision of a screen structure for insertion within the tube.

REFERENCES:
patent: 879583 (1908-02-01), Pratt
patent: 1173583 (1916-02-01), Johnston
patent: 2034686 (1936-03-01), Lattner
patent: 2047443 (1936-07-01), Starkweather
patent: 2311676 (1943-02-01), Maxim
patent: 2576522 (1951-11-01), Kiffin
patent: 2618353 (1952-11-01), Hedrick
patent: 3106984 (1963-10-01), Carter
patent: 3209861 (1965-10-01), Whitney
patent: 3315761 (1967-04-01), Selig
patent: 3415338 (1968-12-01), McMillan
patent: 3952590 (1976-04-01), Howard et al.

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