Decentralized Feedback Control of Broadband Duct Noise with Nodal Placement of Colocated Actuator-Sensor Pairs

[+] Author and Article Information
V. Jayachandran, Maria V. Petrova, Florence J. Li, Patrick King, Nancy E. Meyer, J. Q. Sun

Department of Mechanical Engineering, University of Delaware, Newark, DE 19716

J. Vib. Acoust 123(1), 119-122 (May 01, 2000) (4 pages) doi:10.1115/1.1309539 History: Received October 01, 1998; Revised May 01, 2000
Copyright © 2001 by ASME
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Grahic Jump Location
Mode shapes for the first five experimentally determined resonant frequencies of the duct. The circles represent points at which the pressure was measured. Top to bottom: 23 Hz, 68 Hz, 109 Hz, 158 Hz and 212 Hz.
Grahic Jump Location
Geometry of the open-ended duct with nodally placed control sources
Grahic Jump Location
Magnitude plots of transfer functions. Top: control speakers to microphone m4 (thick solid line: C1, thin solid line: C2, dash-dot: C3). Middle: disturbance speaker to error microphones (thick solid line: m1, thin solid line: m2, dash-dot: m3). Bottom: control speakers to error microphones (thick solid line: C1 to m1, thin solid line: C2 to m2, dash-dot: C3 to m3).
Grahic Jump Location
Pressure spectrum before and after control at microphone m4 near the open end of the duct. Thick solid line: uncontrolled response. Thin line: controlled response.




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