垂直入射弹性板中泄漏Lamb模附近声传输的换能器有限孔径效应
Transducer finite aperture effects in sound transmission near leaky Lamb modes in elastic plates at normal incidence
摘要：
超声波与流体粘弹性板、管和壳的相互作用在过去的几十年里得到了广泛的理论和实验研究。在垂直入射通过传输测量的水嵌入固体板使用超声压电换能器声场，显着偏离平面波理论最近已被观察到。为了定量地描述这种测量现象，有限元建模（FEM），也结合了角谱法（ASM），已被用于三维（3D）模拟的电压声压信号传播通过电声测量系统组成的压电换能器，水嵌入钢板，和流体区域在板的两侧。观察到的现象的频率下移的板共振，增加声压水平通过板，和光束变窄/变宽，归因于有限的角谱的光束，激发一个区域的负和零群速度的泄漏兰姆模式的问题。
英文摘要：
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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