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      Transducer finite aperture effects in sound transmission near leaky Lamb modes in elastic plates at normal incidence

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          Abstract

          The interaction of ultrasonic waves with fluid-embedded viscoelastic plates, pipes, and shells, have been subject to extensive theoretical and experimental studies over several decades. In normal-incidence through-transmission measurements of a water-embedded solid plate using ultrasonic piezoelectric transducer sound fields, significant deviations from plane wave theory have recently been observed. To quantitatively describe such measured phenomena, finite element modeling (FEM), also combined with an angular spectrum method (ASM), have been used for three-dimensional (3D) simulation of the voltage-to-sound-pressure signal propagation through the electro-acoustic measurement system consisting of the piezoelectric transducer, the water-embedded steel plate, and the fluid regions at both sides of the plate. The observed phenomena of frequency downshift of the plate resonance, increased sound pressure level through the plate, and beam narrowing / widening, are ascribed to the finite angular spectrum of the beam, that excites a region of negative and zero group velocity for the leaky Lamb mode in question.

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          Author and article information

          Journal
          2016-04-08
          Article
          1604.02258
          88ae39a9-b137-4675-9815-de5c8a33cef9

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          5 pages, 1 figure; part of the Proceedings of the 39th Scandinavian Symposium on Physical Acoustics (arXiv:1604.01763)
          physics.ins-det

          Technical & Applied physics
          Technical & Applied physics

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