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Proceedings Paper

Impedance-based modeling of actuators bonded to shell structures
Author(s): Frederic Lalande; Zaffir A. Chaudhry; Craig A. Rogers
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Paper Abstract

When discrete piezoelectric actuator patches bonded on structures are used for active shape, vibration, and acoustic control, the desired deformation field in the structure is obtained through the application of localized line forces and moments generated by expanding or contracting bonded piezoelectric actuators. An impedance-based model to predict the dynamic response of cylindrical shells subjected to excitation from surface-bonded induced strain actuators is presented. The essence of the impedance approach is to match the actuator impedance with the structural impedance at the ends of the actuators, which will retain the dynamic characteristics of the actuators. A detailed derivation of the actuator and structural impedance is included. It is found that the actuator's output dynamic force in the axial and tangential direction are not equal. Various case studies of a cylindrical thin shell are performed to illustrate the capabilities of the developed impedance model. Out-of-phase actuation is shown to be the most efficient in exiciting the lower order bending modes of shell structures. The paper is concluded with a finite element analysis verification of the derived impedance model.

Paper Details

Date Published: 8 May 1995
PDF: 13 pages
Proc. SPIE 2443, Smart Structures and Materials 1995: Smart Structures and Integrated Systems, (8 May 1995); doi: 10.1117/12.208277
Show Author Affiliations
Frederic Lalande, Virginia Polytechnic Institute and State Univ. (United States)
Zaffir A. Chaudhry, Virginia Polytechnic Institute and State Univ. (United States)
Craig A. Rogers, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 2443:
Smart Structures and Materials 1995: Smart Structures and Integrated Systems
Inderjit Chopra, Editor(s)

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