Modal analysis of Lamb wave generation in elastic plates by liquid wedge transducers
- Groupe de Physique des Solides, Universites Paris 7 et Paris 6, Tour 23, 2 place Jussieu, 75251 Paris Cedex 05 (France)
A modal analysis is presented to describe the excitation of Lamb waves in an elastic plate using a liquid wedge transducer. Analytical expression for the displacement of a given mode is derived for the excitation by a uniform bounded beam. In contrast to previous studies, the contribution of the reflected wave is included in the input exciting forces using a perturbation theory. The conversion efficiency, defined as the ratio of the guided mode power to the incident power, is related to a single parameter which depends on the rate of attenuation due to leakage from the guided wave into the liquid wedge. Numerical results relevant to the fundamental Lamb modes are obtained as a function of frequency for various incident beam widths and plate thickness. Using optical interferometric detection, direct measurements of the Lamb modes displacements have been carried out in aluminium plates to verify the theoretical analysis. {copyright} {ital 1997 Acoustical Society of America.}
- OSTI ID:
- 489279
- Journal Information:
- Journal of the Acoustical Society of America, Vol. 101, Issue 2; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Direct imaging of traveling Lamb waves in plates using photorefractive dynamic holography
Lamb Wave Focusing Transducer for Efficient Coupling to Wavelength-Scale Structures in Thin Piezoelectric Films