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RESEARCH PAPERS: Active Noise Control

An Active Sound Absorber With Porous Plate

[+] Author and Article Information
D. Guicking, E. Lorenz

Drittes Physikalisches Institut, University of Göttingen, Göttingen, Federal Republic of Germany

J. Vib., Acoust., Stress, and Reliab 106(3), 389-392 (Jul 01, 1984) (4 pages) doi:10.1115/1.3269206 History: Received December 13, 1983; Online November 23, 2009

Abstract

An active equivalent of the λ/4 resonance absorber with a porous plate or foil of flow resistance ρc is described. The porous layer is backed by a loudspeaker driven such that zero sound pressure is maintained in the air gap between foil and speaker. The simultaneous control of magnitude and phase has been achieved in analog technique by a combination of open-loop and closed-loop control, utilizing single sideband modulation of the compensation signal with a weak infrasonic auxiliary signal. The on-off ratio of the reflection coefficient reaches −60 dB for sinusoidal sound, and −20 dB for broadband noise.

Copyright © 1984 by ASME
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