Experimental investigation of the acoustic black hole effect for vibration damping in elliptical plates
Experimental investigation of the acoustic black hole effect for vibration damping in elliptical plates
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DOI：
10.1121/1.2933786
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发表时间：
2008-05
影响因子：
2.4
通讯作者：
F. Gautier;J. Cuenca;V. Krylov;Laurent Simon
中科院分区：
文献类型：
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作者：
F. Gautier;J. Cuenca;V. Krylov;Laurent Simon
众所周知，如果梁或板的厚度减小，弯曲波就会减慢。可以设计在其边界之一附近厚度减小的梁或板，使得波到达边缘所需的传播时间变得无穷大。因此，与相应区域相关的反射系数为零。这种效应被称为声学黑洞效应。 V.V. 对“声学黑洞”与幂律分布楔形薄阻尼层的结合使用进行了理论和实验研究。克雷洛夫和 R.E.T.B. Winward（JSV 300 (2007) 43-49）。本文的目的是通过实验展示二维结构中的声学黑洞效应，该二维结构包括椭圆板，其焦点之一具有幂律分布的凹坑。板的椭圆形状引起波向黑洞的聚焦，这是通过扫描激光测振法观察到的。输入移动电源比较
It is well known that flexural waves in beams or plates slow down if their thickness decreases. A beam or a plate with a decreasing thickness in the vicinity of one of their boundaries can be designed so that the travel time needed for a wave to reach the edge becomes infinite. Thus, the reflection coefficient associated with the corresponding region is zero. This effect is referred to as the acoustic black hole effect. The use of 'acoustic black holes' in combination with thin damping layers for wedges of power‐law profile has been theoretically and experimentally studied by V.V. Krylov and R.E.T.B. Winward (JSV 300 (2007) 43‐49). The aim of this paper is to show experimentally the acoustic black hole effect in a two‐dimensional configuration comprising an elliptical plate with a pit of power‐law profile placed in one of its focuses. The elliptical shape of the plate induces a focalization of waves towards the black hole, which is observed by means of scanning laser vibrometry. Comparison of input mobili...