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TECHNICAL PAPERS

An Improved Acoustic Model for Active Noise Control in a Duct

[+] Author and Article Information
Benjamin J. Zimmer

Meikle Automation, Kitchener, Ontario, Canada

Stanley P. Lipshitz, Kirsten A. Morris

Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, Canada

John Vanderkooy

Department of Physics, University of Waterloo, Waterloo, Ontario, Canada

Edmund E. Obasi

RDWI Ltd., Calgary, Alberta, Canada

J. Dyn. Sys., Meas., Control 125(3), 382-395 (Sep 18, 2003) (14 pages) doi:10.1115/1.1592192 History: Received September 07, 2001; Revised March 29, 2003; Online September 18, 2003
Copyright © 2003 by ASME
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References

Figures

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Acoustical duct system.
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Normalized impedance ZL0c (Solid) and the rational approximation to ZL0c(dashed). (For our duct, normalized frequency is f/537.)
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Measured (dashed) and calculated (solid) input voltage to loudspeaker cone acceleration frequency responses.
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Measured (dashed) and calculated (solid) canceller speaker to mid microphone frequency responses, with rigid plug at x=0.
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Measured (dashed) canceller speaker to mid microphone frequency response, with loudspeaker at x=0. Calculation is with rigid.
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Measured (dashed) and calculated (solid) disturbance speaker to end microphone frequency responses.
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Measured (dashed) and calculated (solid) disturbance speaker to mid microphone frequency responses.
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Measured (dashed) and calculated (solid) canceller speaker to end microphone frequency responses.
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Measured (dashed) and calculated (solid) canceller speaker to mid microphone frequency responses.

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