Acoustics – Sound-modifying means – Housing or enclosure
Patent
1995-04-18
1997-04-29
Dang, Khanh
Acoustics
Sound-modifying means
Housing or enclosure
181224, E04F 1704
Patent
active
056251726
ABSTRACT:
A sound attenuator for an enclosure, in particular, an apparatus for attenuating the sound at the openings which allow air to enter and exit an internal combustion engine enclosure with minimal pressure loss. The attenuator comprises a combination of passive sound absorptive louvers place in series with a plurality of reactive Helmholtz resonator units mounted in parallel rows in the open area between each pair of louver. The Helmholtz resonators being tuned to attenuate a single or multiple low frequency noise spikes. The attenuator providing improved sound attenuation and requiring substantially less volume than a typically used absduct type silencer.
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Blichmann John R.
Johnson Brian S.
Becker Mark D.
Caterpillar Inc.
Dang Khanh
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