Flyover Noise Reduction of Piston-Engine Propeller Aeroplanes Using an Active Noise Control Technique

Format:

Conference/Event

Author/Creator:

Kallergis, Michael K., author.

Conference Name:

General, Corporate & Regional Aviation Meeting & Exposition (1993-05-17 : Wichita, Kansas, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1993

Summary:

Certain propeller driven aeroplanes are equipped with piston engines whose fundamental "firing"-frequency coincides with the rotational frequency of the propeller. Taking the two sources as a system consisting of a primary source (propeller) and a secondary anti-noise source (engine exhaust), an active noise control (ANC) technique can be applied. The far field noise of both the propeller and the engine exhaust is characterised by periodic sound pressure fluctuations; by generating a suitable phase shift between these two periodic sound-fields, a destructive interference may be attained, resulting in a reduced overall noise level immission on the ground. Technically, this is achieved by (1) adjusting the spatial distance between the exhaust orifice and the propeller and (2) an appropriate azimuthal positioning of the propeller on the crankshaft of the engine

Notes:

Vendor supplied data

Publisher Number:

931218

Access Restriction:

Restricted for use by site license