Piezoelectric transducer parameter selection for exciting a single mode from multiple modes of Lamb waves

doi:10.1088/1674-1056/20/9/094301

Abstract Excitation and propagation of Lamb waves by using rectangular and circular piezoelectric transducers surface-bonded to an isotropic plate are investigated in this work. Analytical stain wave solutions are derived for the two transducer shapes, giving the responses of these transducers in Lamb wave fields. The analytical study is supported by a numerical simulation using the finite element method. Symmetric and antisymmetric components in the wave propagation responses are inspected in detail with respect to test parameters such as the transducer geometry, the length and the excitation frequency. By placing only one piezoelectric transducer on the top or the bottom surface of the plate and weakening the strength of one mode while enhancing the strength of the other modes to find the centre frequency, with which the peak wave amplitude ratio between the S0 and A0 modes is maximum, a single mode excitation from the multiple modes of the Lamb waves can be achieved approximately. Experimental data are presented to show the validity of the analyses. The results are used to optimize the Lamb wave detection system.

Keywords: Lamb waves parameter selection analytical stain wave solutions single mode

Received: 28 March 2011
Revised: 15 April 2011
Accepted manuscript online:

PACS:	43.20.+g	(General linear acoustics)
	43.35.+d	(Ultrasonics, quantum acoustics, and physical effects of sound)
	47.35.Rs	(Sound waves)

Cite this article:

Zhang Hai-Yan(张海燕) and Yu Jian-Bo(于建波) Piezoelectric transducer parameter selection for exciting a single mode from multiple modes of Lamb waves 2011 Chin. Phys. B 20 094301

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Piezoelectric transducer parameter selection for exciting a single mode from multiple modes of Lamb waves

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