In-line noise attenuation device

Details In-line noise attenuation device In-line noise attenuation device

1989-11-21

1990-06-19

Okonsky, David A.

Internal-combustion engines

Multiple cylinder

181206, 181229, 60312, F02M 3500

Patent

active

049343432

ABSTRACT:
The device has an entrance and an exit with two low-restriction venturi sections placed in parallel between the entrance and exit. The entering gas flow is separated into two parts, one to pass through one venturi section and the other to pass through the other venturi section. The two parts reunite as they leave the exit. The venturi sections are substantially identical and each contains at least one venturi. The two sections are axially offset from each other by a distance that is equal to one-quarter of the wavelength of the frequency of a principal noise component so that that particular noise frequency is phase shifted 180 degrees by one venturi section relative to the other with resulting cancellation and significant noise attenuation. Usage in an air induction system of an internal combustion engine for attenuating noise from the engine is illustrated. The device is capable of functioning irrespective of the direction of noise in relation to the direction of gas flow.

REFERENCES:
patent: 3948349 (1976-04-01), Bychinsky
patent: 4254746 (1981-03-01), Chiba et al.
patent: 4359134 (1982-11-01), Jackson

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