Active Reduction of Radiated Noise From a Baffled Piston Using a Volume Velocity, Feedforward Controller

[+] Author and Article Information
K. Naghshineh, J. W. Kamman

Mechanical and Aeronautical Engineering Department, Western Michigan University, Kalamazoo, MI 49008

V. B. Mason

2564 Greer Road, Palo Alto, CA 94303

J. Vib. Acoust 120(2), 484-490 (Apr 01, 1998) (7 pages) doi:10.1115/1.2893855 History: Received January 01, 1996; Online February 26, 2008


A new active noise-control technique has been developed for control of low-frequency sound generated by vibrating surfaces which is based on minimizing the volume velocity. Noise reduction is achieved by distributing an array of control devices over the surface of the radiating structure. Each device consists of a motion-sensing mechanism, an analog control circuit, and a loudspeaker. The loudspeaker is driven such that it reduces the volume velocity of the radiating structure within its close proximity. This paper briefly presents the theory behind this approach as well as controller design issues. Finally, a discussion of the experimental verification of this concept using a 10-in. uniformly vibrating circular plate (i.e., a baffled piston) and a single noise-control device is given. Broadband (50–500 Hz) sound reductions in the range of 10–20 dB were achieved over a wide spatial area.

Copyright © 1998 by The American Society of Mechanical Engineers
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