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M. Kozek, F. Höftberger, M. Gusenbauer:
"Active Damping of a Quadratic Plate for a Non-Collocated Disturbance";
Talk: ICSV13 - Thirteenth International Congress on Sound and Vibration, Wien; 2006-07-02 - 2006-07-06; in: "CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13)", (2006), 8 pages.

In this work the active damping of a quadratic plate using two piezo patch actuators is described. A numerical evaluation of an optimality criterion for placement of sensors and actuators defines the location for the piezo patches. A state-space controller in combination with an observer and an alternative 2nd-order controller with acceleration feedback are designed to add additional damping to the existing modes. Specific attention was paid to suppress spillover (amplification of modes due to neglected dynamics), and a frequency response mode was added to account for the effect of higher-order modes.With two actuators in optimal positions only a small band of maximal two eigenmodes could be efficiently damped. Nevertheless, a
mode at 167Hz showed an attenuation of over 17dB. Additional problems were posed by a bifurcation of the modal behaviour and the relation between plate and sensor thickness.

http://publik.tuwien.ac.at/files/pub-mb_4577.pdf