Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements

2019, Volume 13, Issue 3

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Frontiers of Structural and Civil Engineering >> 2019, Volume 13, Issue 3 doi: 10.1007/s11709-018-0496-0

Detection of void and metallic inclusion in 2D piezoelectric cantilever beam using impedance measurements

. Institute of Continuum Mechanics, Leibniz University Hannover, 30167 Hannover, Germany.. Indian Institute of Technology, Madras Chennai 600036, India.. College of Civil Engineering, Tongji University, Shanghai 200092, China

Accepted: 2018-08-23 Available online: 2018-08-23

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Abstract

The aim of current work is to improve the existing inverse methodology of void-detection based on a target impedance curve, leading to quick-prediction of the parameters of single circular void. In this work, mode-shape dependent shifting phenomenon of peaks of impedance curve with change in void location has been analyzed. A number of initial guesses followed by an iterative optimization algorithm based on univariate method has been used to solve the problem. In each iteration starting from each initial guess, the difference between the computationally obtained impedance curve and the target impedance curve has been reduced. This methodology has been extended to detect single circular metallic inclusion in 2D piezoelectric cantilever beam. A good accuracy level was observed for detection of flaw radius and flaw-location along beam-length, but not the precise location along beam-width.

Keywords

piezoelectricity ; impedance curve ; mode shapes ; inverse problem ; flaw detection ; curve shifting

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