Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1997-09-30
1999-01-19
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
E04F 1704
Patent
active
058615857
ABSTRACT:
The invention provides an elongate turning vane for altering the direction of air flow in a duct, such as a wind tunnel, where the vane includes a device for attenuating sound propagation past the vane. The vane has extreme ends mounted to opposing sides of the duct, a longitudinal axis and an aerodynamically efficient profile. The vane comprises a rigid core having air permeable upper and lower surfaces, preferably a welded assembly of two perforated sheet metal plates with transverse profile plates, with vent holes, to provide the appropriate shape and venting. Two sound attenuating panels have interior surfaces bonded to the upper and lower core surfaces of the core, and exterior surfaces defining suction and pressure surfaces of the vane. Vent holes provide for passage of air axially within the core between the duct and the core surfaces. Venting is required to balance the air pressure on both sides of the sound attenuating panels to prevent distortion of the panels bonded to the core. Rippling and other distortions detrimentally effect the aerodynamic efficiency of the vane. To preserve the aerodynamic shape of the vane and structural integrity, a rigid nose fairing is mounted to a leading edge of the core, and a rigid tail fairing mounted to a trailing edge of the core. A protective layer on the exterior surfaces of the sound attenuating panels provides mechanical protection from air borne debris and contaminants. The protective layer is preferably a matte urethane film that is impervious to air for protection of the panels and is pervious to sound propagation between the duct and the sound attenuating panels to preserve the sound attenuating properties of the panels.
REFERENCES:
patent: 3739872 (1973-06-01), McNair
patent: 4330047 (1982-05-01), Ruspa et al.
patent: 5756944 (1998-05-01), Battig et al.
Fedoruk Roy
Van Every David H.
Aiolos Engineering Corporation
Dang Khanh
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