| Title |
Estimating High-Frequency Damping of a Beam through Electro-Mechanical Signatures of Piezoelectric Wafer Mounted on the Beam |
| Authors |
신용재(Shin, Yong Jae) ; 박현우(Park, Hyun Woo) |
| DOI |
https://doi.org/10.12652/Ksce.2017.37.1.0217 |
| Keywords |
압전웨이퍼;보;전기역학적 신호;감쇠추정;구조물 건전성 감시 Piezoelectric wafer (PZT);Beam;Electro-mechanical signatures;Damping estimation;Structural health monitoring |
| 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. |