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首页> 外文期刊>Physical review >Waveguiding and frequency selection of Lamb waves in a plate with a periodic stubbed surface
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Waveguiding and frequency selection of Lamb waves in a plate with a periodic stubbed surface

机译：带有周期性短截距板的兰姆波的波导和频率选择

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In this paper, we numerically and experimentally study the waveguiding of Lamb modes in a thin plate with a periodic stubbed surface and propose a frequency-selection method based on the found complete band gaps of Lamb waves in the periodic structure. In the numerical simulations, we employ finite-element method to analyze the waveguiding effect of a line defect created in the periodic plate structure; and on the experimental side, we utilize a pulsed laser to generate broadband elastic-wave energy and a laser interferometer to receive the wave signals inside the line-defect waveguide. In the experiment, well-confined acoustic energy in the acoustic band gaps is observed. Furthermore, a polyline sharply bent waveguide is designed and used for the frequency selection of Lamb waves. Measurements show that acoustic energy with frequencies in the band gaps can be separated out and guided by the bent waveguiding route. The characteristics of deaf bands found in the experiment are discussed as well.
机译：在本文中，我们通过数值和实验研究了具有周期性短截面的薄板中的Lamb模的波导，并基于在周期结构中发现的Lamb波的完整带隙，提出了一种频率选择方法。在数值模拟中，我们采用有限元方法来分析周期板结构中产生的线缺陷的波导效应。在实验方面，我们利用脉冲激光产生宽带弹性波能量，并利用激光干涉仪接收线缺陷波导内部的波信号。在实验中，在声带隙中观察到了有限的声能。此外，设计了折线急剧弯曲的折线并将其用于兰姆波的频率选择。测量表明，在带隙中具有频率的声能可以被弯曲的波导路径分离并引导。还讨论了在实验中发现的聋带的特性。

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