Active sound attenation system for engine exhaust systems and th

Details Active sound attenation system for engine exhaust systems and th Active sound attenation system for engine exhaust systems and th

1989-11-07

1992-03-24

Brown, Brian W.

Acoustics

Sound-modifying means

By wave interference

381 71, F01N 106

Patent

active

050979230

ABSTRACT:
An active sound attenation system for combustion engine exhaust systems and the like is disclosed. To protect the counter-noise acoustic wave generator from the environment of the medium propagating the undesirable noise, an acoustically tuned anti-noise chamber is interposed between the wave generators 19, 19A and the location of the medium with the undesirable noise. To provide for global cancellation at the outlet end 4, of the exhaust pipe 10, the anti-noise chamber 11, 11A has an annular opening disposed substantially in the plane 4 of the exhaust pipe outlet thereby giving the undesirable noise and the cancelling noise an apparent common source.

REFERENCES:
patent: 3712412 (1973-01-01), Hassett et al.
patent: 3826870 (1974-07-01), Wurm et al.
patent: 4122303 (1978-10-01), Chaplin et al.
patent: 4177874 (1979-12-01), Angelini et al.
patent: 4489441 (1984-12-01), Chaplin
patent: 4527282 (1985-07-01), Chaplin et al.
"Electronics Cancel Noise and Vibration at Source", Motorship, vol. 68, No. 806, Sep. 1987, London GB, p. 47.

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