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9 June 1999 Vibration control of a plate structure with piezoelectric stack actuators
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This paper explores the effectiveness of piezoelectric stack actuators for active control of 2D structures. The experimental results of active vibration reduction of an aluminum plate are presented. Piezoelectric patches are commonly used as a component of smart structures, because they can be either attached to or imbedded directly into the structure. The efficiency of piezo patches for vibration control strongly depends on the frequency and the location of the actuators. Mode shapes and strain distributions help to optimize the location of this actuator type. If the wavelength of the modes is decreased to the size of the actuator's finite length, some modes will always be uncontrollable, even if the actuator is optimally located. This limitation is not valid for point force actuators. Therefore the use of four piezoelectric stack actuators, which simultaneously support a plate structure at each corner and generate the control forces, is investigated in this paper. Because of many unknown parameters, the dynamic model of the test structure is obtained by an identification process instead of Finite Element Modeling. Control outputs are computed on the basis of a modal state observer considering 20 modes in connection with a linear quadratic optimal controller. The developed active vibration control achieves excellent results for the reduction at the resonance frequencies.
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Michael Maertens and Heinz Waller "Vibration control of a plate structure with piezoelectric stack actuators", Proc. SPIE 3668, Smart Structures and Materials 1999: Smart Structures and Integrated Systems, (9 June 1999); doi: 10.1117/12.350749;

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