Optical evaluation of the wave filtering properties of graded undulated lattices
Optical evaluation of the wave filtering properties of graded undulated lattices
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DOI：
10.1063/1.5011369
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发表时间：
2018-03-07
影响因子：
3.2
通讯作者：
Ruzzene, M.
中科院分区：
文献类型：
--
作者：
Trainiti, G.;Rimoli, J. J.;Ruzzene, M.
我们研究并通过实验证明了渐变波状晶格的弹性波滤波特性。由曲梁组成的方形网状结构具有由曲率参数的空间调制产生的分级机械性能。在这些特性中，频带间隙的逐渐形成导致在宽频率范围内强烈的波衰减。波传输的实验研究和全波场的检测有效地说明了这种行为。使用扫描激光多普勒振动计进行传输测量，同时实施专用数字图像相关程序以捕获选定频率的平面内波运动。所提出的结果说明了由晶格曲率的空间分级产生的宽带衰减特性，其深入研究是通过所提出的实验程序实现的。由 AIP 出版社出版。
We investigate and experimentally demonstrate the elastic wave filtering properties of graded undulated lattices. Square reticulates composed of curved beams are characterized by graded mechanical properties which result from the spatial modulation of the curvature parameter. Among such properties, the progressive formation of frequency bandgaps leads to strong wave attenuation over a broad frequency range. The experimental investigation of wave transmission and the detection of full wavefields effectively illustrate this behavior. Transmission measurements are conducted using a scanning laser Doppler vibrometer, while a dedicated digital image correlation procedure is implemented to capture in-plane wave motion at selected frequencies. The presented results illustrate the broadband attenuation characteristics resulting from spatial grading of the lattice curvature, whose in-depth investigation is enabled by the presented experimental procedures. Published by AIP Publishing.