Wind tunnel with air vibration phase cancellation

Details Wind tunnel with air vibration phase cancellation Wind tunnel with air vibration phase cancellation

1998-09-23

2000-12-05

Oen, William

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

G01M 900

Patent

active

061551112

ABSTRACT:
A wind tunnel consisting of a closed loop passageway including a test station and an impellor for producing an air stream through such passageway, a device for detecting the standing sound wave of such air stream at the test station and control means responsive to such standing sound wave for propagating at least one sound wave of a selected phase at a point in such air stream to nullify such standing sound wave.

REFERENCES:
patent: 2043416 (1936-06-01), Lueg
patent: 5025659 (1991-06-01), Starr, Jr. et al.
patent: 5435175 (1995-07-01), Kramer
"Active Control of Sound and Vibration" by C.R. Fuller and A.H. von Flotow, 0272-1708/95$04.00.COPYRGT.1995IEEE, IEEE Control Systems, pp. 9-17, Dec. 1995.
"Wanden im Porsche Windkanal" by Von Winfried Eckert, Jorg Dieter Vagt und Burkhard Wolff, ATZ Automobiltechnische Zeitschrift 92 (1990), pp. 286-297 (no mo.).
"Askustik Windkanal Von BMW Ruhe Im Sturn" by Von Wolf-Heinrich Hucho, mot-Technik, pp. 144-152, 20/1989. (no mo.).
"Adaptive-Wall Wind Tunnel" by NASA Tech Brief, Ames Research Center, Moffett Field, California, p. 569, Jul., 1998.

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