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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Focusing of Rayleigh waves: simulation and experiments
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Focusing of Rayleigh waves: simulation and experiments

机译：瑞利波聚焦：模拟和实验

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摘要

A linear array of surface wave transducers has been developed to generate focused surface wave motion. A novel theoretical approach, whereby time-harmonic surface wave motion is represented by a carrier wave that satisfies a reduced wave equation on the surface of the body and supports the subsurface motion, is used to model the beam generated by a single element of the array. Comparison of theoretical and experimental results show that, for a single element, the opening angle of the beam is about 20/spl deg/ and its cross-section can be represented by a Gaussian distribution of the normal displacements. For an eight-element array, the focused beam is subsequently obtained by superposition considerations. For the focused beam comparisons of theoretical and experimental results, in which the latter have been obtained by the use of a laser interferometer, show excellent agreement both for the normal displacements along a radial line and across the width of the beam. The array can be used for self-focusing of surface waves on a surface defect.
机译：已经开发出表面波换能器的线性阵列以产生聚焦的表面波运动。一种新颖的理论方法，即时谐表面波运动由满足人体表面简化波方程并支持次表面运动的载波表示，用于模拟由阵列的单个元素生成的光束。理论和实验结果的比较表明，对于单个单元，梁的张开角约为20 / spl deg /，并且其横截面可以由法向位移的高斯分布表示。对于八元件阵列，随后通过叠加考虑获得聚焦光束。对于聚焦光束的理论和实验结果比较，后者是通过使用激光干涉仪获得的，显示了沿径向线和整个光束宽度的法向位移的极佳一致性。该阵列可以用于表面缺陷在表面缺陷上的自聚焦。

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