Active Noise Control Using Phase-Compensated, Damped Resonant Filters

[+] Author and Article Information
Jesse B. Bisnette, Adam K. Smith, Jeffrey S. Vipperman

Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, PA 15261

Daniel D. Budny

Department of Civil Engineering, University of Pittsburgh, Pittsburgh, PA 15261

J. Vib. Acoust 128(2), 148-155 (Jul 16, 2005) (8 pages) doi:10.1115/1.2149393 History: Received August 17, 2003; Revised July 16, 2005

An active noise control device called active noise absorber or ANA, which is based upon damped, resonant filters is developed and demonstrated. It is similar to structural positive position feedback (PPF) control, with two exceptions: (1) Acoustic transducers (microphone and speaker) cannot be truly collocated, and (2) the acoustic actuator (loudspeaker) has significant dynamics. The speaker dynamics can affect performance and stability and must be compensated. While acoustic modal control approaches are typically not sought, there are a number of applications where controlling a few room modes is adequate. A model of a duct with speakers at each end is developed and used to demonstrate the control method, including the impact of the speaker dynamics. An all-pass filter is used to provide phase compensation and improve controller performance and permits the control of nonminimum phase plants. A companion experimental study validated the simulation results and demonstrated nearly 8 dB of control in the first duct mode. A multi-modal control example was also demonstrated producing an average of 3 dB of control in the first four duct modes.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Rigid walled acoustic duct setup

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Figure 2

Schematic showing system conventions

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Figure 3

Simulated and experimental results for uncontrolled disturbance to error path

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Figure 4

Frequency response of control speaker, duct, and duct+speaker

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Figure 5

Frequency response of control-path and low-pass filter

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Figure 6

Uncontrolled/controlled disturbance-error response without speaker dynamics

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Figure 7

Uncontrolled/controlled disturbance-error response with uncompensated speaker dynamics

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Figure 8

Uncontrolled/controlled disturbance-error response using all-pass filter

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Figure 9

NYQUIST Plot of open-loop low-pass filter with and without phase compensation

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Figure 10

Measured fully compensated control-path

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Figure 11

Uncontrolled/controlled mode 1 disturbance-error response for various gain values

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Figure 12

Uncontrolled/controlled disturbance-error response over 500 Hz frequency range

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Figure 13

Uncontrolled/controlled disturbance-error response over 500 Hz frequency range



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