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TECHNICAL PAPERS

Subspace-Based System Identification for an Acoustic Enclosure

[+] Author and Article Information
Tomas McKelvey

Dept. of Signals and Systems, Chalmers University of Technology, DE-412 96 Gothenburg, Sweden

Andrew Fleming, S. O. Reza Moheimani

Dept. of Electrical and Computer Eng., University of Newcastle, Callaghan, NSW 2308, Australia

J. Vib. Acoust 124(3), 414-419 (Jun 12, 2002) (6 pages) doi:10.1115/1.1467653 History: Received January 01, 2001; Revised January 01, 2002; Online June 12, 2002
Copyright © 2002 by ASME
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References

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Figures

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Plan view of the acoustic duct apparatus
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The experimental acoustic enclosure
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Magnitude response of the acoustic actuators from applied voltage to baffle acceleration
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Magnitude transfer functions of parametric model estimate of order 29 from subspace algorithm and ETFE from validation data. The magnitude of the error also is shown. The transfer functions are derived from the applied actuator voltage to measured microphone preamp voltage. (-) Validation Data, (- -) Estimated model, (- ⋅ -) Error.
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Final estimated model after parametric optimization of LS criterion. Magnitude and error plot showing estimated model of order 29 and ETFE from validation data. The transfer functions are derived from the applied actuator voltage to measured microphone preamp voltage. (-) Validation Data, (- -) Estimated model, (- ⋅ -) Error.
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Time domain comparison between the simulated output of the estimated model and the measured output. The input and outputs are taken as the applied actuator voltage and microphone preamp voltage. (-) Validation Data, (- -) Estimated model, (- ⋅ -) Error.
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Result from a real-time validation experiment comparing the simulated output of the estimated model and the measured output of the system. The input and outputs are taken as the applied actuator voltage and microphone preamp voltage. (-) Real time measurement, (- -) Estimated model, (- ⋅ -) Error.

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