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http://dx.doi.org/10.12652/Ksce.2017.37.1.0217

Estimating High-Frequency Damping of a Beam through Electro-Mechanical Signatures of Piezoelectric Wafer Mounted on the Beam  

Shin, Yong Jae (Dong-A University)
Park, Hyun Woo (Dong-A University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.37, no.1, 2017 , pp. 217-229 More about this Journal
Abstract
The high-frequency electro-mechanical signatures, which are excited and received by piezoelectric wafers mounted on a beam, are sensitive to incipient defect in a beam. Predicting the sensing range of the piezoelectric wafers is needed to effectively conduct damage assessment of a beam through utilizing their advantage. Damping of a beam plays the most important role in determining the sensing range among other features. This paper has proposed a scheme for estimating high-frequency damping of a beam through electro-mechanical signatures of piezoelectric wafers mounted on the beam. Considering damping effect while resonance of a beam evolves, wave perspective is adopted to formulate the electro-mechanical signatures of piezoelectric wafers. The damping of a beam is estimated through the least squares method minimizing the difference between the calculated and the measured damping ratio function values which are obtained from formulated and measured electro-mechanical signatures, respectively. The validity of the proposed scheme has been demonstrated through numerical and experimental examples using an aluminum beam with collocated piezoelectric wafers.
Keywords
Piezoelectric wafer (PZT); Beam; Electro-mechanical signatures; Damping estimation; Structural health monitoring;
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