201 圧電素子による高周波域での自己コンプライアンス計測

概要

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In recent years, structural health monitoring methods rely on electrical impedance of piezoelectric elements are researched by many researchers. The electrical impedance is related to the mechanical impedance of the structure that is sensitive to presence of damages, especially in high frequency range. In conventional method, only the real part of the electrical impedance is used for health monitoring. However, the real part of the electrical impedance does not contain full information about the mechanical impedance, the real and the imaginary part. Our proposed method removes the effect of capacitance from the admittance (inverse of impedance) of the piezoelectric element and obtains the real and the imaginary part of the compliance of the structure. Obtained compliance of healthy structure and damaged structure are curve fitted. Curve fitted compliance catches the difference between the healthy and the damaged
社団法人日本機械学会の論文
2002-09-13