Modal analysis of Lamb wave generation in elastic plates by liquid wedge transducers

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of the Acoustical Society of America

DOI:https://doi.org/10.1121/1.418041· OSTI ID:489279

Jia, X ^[1]

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1. 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, Journal Name: Journal of the Acoustical Society of America Journal Issue: 2 Vol. 101; ISSN 0001-4966; ISSN JASMAN
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
ALUMINIUM
ELASTICITY
LIQUIDS
NUMERICAL ANALYSIS
PERTURBATION THEORY
PHOTOACOUSTIC EFFECT
REFLECTION
TRANSDUCERS
ULTRASONIC WAVES
WAVE PROPAGATION
surface acoustic waves