Experimental and theoretical study of vibrations of a cantilevered beam using a ZnO piezoelectric sensor

Authors

B. R. Jooste, University of Nebraska - Lincoln
Hendrik J. Viljoen, University of Nebraska - LincolnFollow
S. L. Rohde, University of Nebraska - LincolnFollow
N. F. J. van Rensburg, Department of Mathematics, University of Pretoria, Pretoria 0001, South Africa

Date of this Version

5-1-1996

Comments

Published in J. Vac. Sci. Technol. A 14(3), May/Jun 1996. Copyright ©1996 American Vacuum Society. Used by permission.

Abstract

Piezoelectric sensors can measure vibrations of solid structures very accurately. A model of a cantilevered beam, with a ZnO film on one side is presented. Both viscous and internal damping are considered. The output of the sensor is modeled and matched with experimental results by adjusting the damping parameters. A theoretical formulation for damage is introduced. Experimental results for a damaged beam confirm the shift in frequencies to lower values. The model is used to identify the extent of the damage.