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Proceedings Paper

Mitigation of acoustic resonance using electrically shunted loudspeakers
Author(s): Andrew J. Fleming; Dominik Niederberger; S. O. Reza Moheimani; Manfred Morari
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Paper Abstract

Low-frequency reverberant sound fields are usually suppressed by means of either adaptive feedforward control or Helmholtz resonator. In this paper, an electrical impedance is connected to the terminals of an acoustic loudspeaker, the mechanical dynamics, and hence acoustic response can be made to emulate a sealed acoustic resonator. No microphone or velocity measurement is required. In some cases, the required electrical circuit is simply the parallel connection of a capacitor and resistor. Experimental application to a closed acoustic duct results in 14 dB pressure attenuation of a single acoustic mode.

Paper Details

Date Published: 15 March 2006
PDF: 12 pages
Proc. SPIE 6169, Smart Structures and Materials 2006: Damping and Isolation, 616918 (15 March 2006); doi: 10.1117/12.659022
Show Author Affiliations
Andrew J. Fleming, Univ. of Newcastle (Australia)
Dominik Niederberger, Swiss Federal Institute of Technology (Switzerland)
S. O. Reza Moheimani, Univ. of Newcastle (Australia)
Manfred Morari, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 6169:
Smart Structures and Materials 2006: Damping and Isolation
William W. Clark; Mehdi Ahmadian; Arnold Lumsdaine, Editor(s)

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