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TECHNICAL PAPERS

Quarter-Cycle Switching Control for Switch-Shunted Dampers

[+] Author and Article Information
Gregg D. Larson, Kenneth A. Cunefare

The George W. Woodruff School of Mechanical Engineering, The Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Vib. Acoust 126(2), 278-283 (May 04, 2004) (6 pages) doi:10.1115/1.1687394 History: Received November 01, 2001; Revised June 01, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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References

Figures

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Prototype switch-shunted damper in (a) isometric view and (b) cross-sectional view (along diameter of SSD). This prototype is shown with a switchable stiffness element comprised of four thin-walled, hollow cylinders of piezoelectric ceramic, a tie rod to maintain the piezoelectric ceramic in compression, a damper mass, and a base for attachment to the structure to be controlled. The control system and electrical connections are not shown in this figure.
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Schematic of experimental setup. The prototype SSD is shown in a cross-sectional view with the control and data acquisition system shown. The positive and negative electrodes have been connected to an analog switch. The motion of the damper mass is monitored by an accelerometer with appropriate filtering and amplification. The excitation drive signal is low-pass filtered before being applied to the drive stack.
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Coordinate system for longitudinally-polarized, thin-walled, hollow cylinder of piezoelectric ceramic
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Open circuit ringdown of SSD: (a) full ringup and ringdown (b) close-up of ringdown
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Short circuit ringdown of SSD: (a) full ringup and ringdown (b) close-up of ringdown
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Input (a) drive signal and (b) switch control signal for quarter-cycle switching
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Measured (a) acceleration, (b) driving signal, and (c) switch control signal, for quarter-cycle switching
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Close-up of measured (a) acceleration and (b) switch control signal for quarter-cycle switching

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