Multi-modal leaky Lamb waves in two parallel and immersed plates: Theoretical considerations, simulations, and measurements.
Multi-modal leaky Lamb waves in two parallel and immersed plates: Theoretical considerations, simulations, and measurements.
复制标题
两个平行浸入板中的多模态漏兰姆波：理论考虑、模拟和测量。
DOI：
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发表时间：
2019
影响因子：
2.4
通讯作者：
F. Baqué
中科院分区：
文献类型：
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作者：
Pierre Kauffmann;M. Ploix;J. Chaix;C. Potel;C. Gueudré;G. Corneloup;F. Baqué
泄漏兰姆波有可能被用来进行无损检测的一组几个平行和浸没的板。短时傅里叶变换和二维傅里叶变换都已成功地用于测量传输特性：相速度、群速度和泄漏衰减。在一个浸入水中的板的情况下，通过理论、实验和有限元模拟（使用comsol multiphysics®软件）之间的比较来验证实验测量。这些信号处理技术被证明是有效的情况下，多模态传播。他们被施加到两个浸没的板，以确定在第二个板中产生的泄漏兰姆模式。计算了由两块浸没平行平板组成的系统的色散曲线。当板具有相同的厚度时，泄漏Lamb模式从第一板传播到第二板而没有任何模式变化，在第二板中的表观衰减较弱。考虑到第二板由第一板连续提供能量，本文提出了基于能量的模型来估计第二板中的表观衰减。尽管我们非常简化的假设，这个模型被证明是在良好的协议与有限元建模和实验。
Leaky Lamb waves have the potential to be used to perform non-destructive testing on a set of several parallel and immersed plates. Short-time Fourier transform and two-dimensional Fourier transform have both been successfully used to measure the propagation properties: phase and group velocity, and leaky attenuation. Experimental measurements were validated by comparison between theory, experimentation and finite-element simulations (using comsol multiphysics® software) in the case of one immersed plate in water. These signal processing techniques proved to be efficient in the case of multi-modal propagation. They were applied to two immersed plates to identify the leaky Lamb mode generated in the second plate. Dispersion curves of the system composed by two immersed and parallel plates are computed. When plates have the same thickness, leaky Lamb modes propagate from the first to the second plate without any mode change, with the apparent attenuation being weaker in the second plate. Considering that the second plate is continuously supplied in energy by the first one, an energy-based model is proposed herein to estimate the apparent attenuation in the second plate. Despite our extremely simplifying assumption, this model proved to be in good agreement with both finite-element modelling and experimentation.