Engine noise control device for use in automobiles or the like

Details Engine noise control device for use in automobiles or the like Engine noise control device for use in automobiles or the like

1984-10-15

1988-06-28

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Housing or enclosure

181206, F01N 106

Patent

active

047533188

ABSTRACT:
Disclosed herein is an engine noise control device for use in automobiles or the like comprising a noise control member which is attached to an opening of an engine room of an automobile or the like. The noise control member has a plurality of hollow conduit passages penetrating from one of surfaces to the other surface thereof. The hollow conduit passages are so arranged that the length of the conduit passages becomes shorter from the central portion to the peripheral portion of the noise control member. Thereby, a noise-propagating direction is changed by controlling the noise to reduce the energy of sounds radiated and/or diffracted to the outside.

REFERENCES:
patent: 3762489 (1973-10-01), Proksch et al.
patent: 4156476 (1979-05-01), Matsumoto et al.
patent: 4299305 (1981-11-01), Eriksson

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