Slots of Power-Law Profile as Acoustic Black Holes for Flexural Waves in Metallic and Composite Plates
Slots of Power-Law Profile as Acoustic Black Holes for Flexural Waves in Metallic and Composite Plates
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DOI：
10.1016/j.istruc.2016.02.002
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发表时间：
2016-05-01
期刊：
影响因子：
4.1
通讯作者：
Krylov, V. V.
中科院分区：
文献类型：
--
作者：
Bowyer, E. P.;Krylov, V. V.
最近发展和研究了一种基于“声学黑洞效应”的板状结构弯曲振动阻尼新方法。作为“声学黑洞”，一维弹性楔的幂律轮廓的窄条的吸收层附近的尖锐的边缘覆盖已被最初使用。将这种幂律轮廓的楔形物添加到矩形板或带的边缘导致在这种板或带中的共振弯曲振动的阻尼的显著增加，这是由于在幂律楔形物的尖端处的弯曲波的更有效的吸收。这种阻尼方法所面临的问题之一是使楔形尖端暴露在板或带的外边缘上。解决这个问题的方法之一是在板内移动楔，使它们在板内形成幂律槽的边缘。本文报道了这种槽对阻尼弯曲振动的影响的实验研究结果。实验结果表明，在板内引入幂律型槽是一种有效的阻尼弯曲振动的方法，与在板边缘使用幂律楔形体的方法相当。(C)2016作者结构工程师学会。爱思唯尔有限公司出版
A new method of damping flexural vibrations in plate-like structures based on the 'acoustic black hole effect' has been recently developed and investigated. As 'acoustic black holes', one-dimensional elastic wedges of power-law profile covered by narrow strips of absorbing layers near sharp edges have been used initially. The addition of such power-law profiled wedges to edges of rectangular plates or strips results in substantial increase in damping of resonant flexural vibrations in such plates or strips due to the more efficient absorption of flexural waves at the tips of power-law wedges. One of the problems faced by this method of damping is having the wedge tips exposed on the outer edges of the plate or strip. One of the solutions to this problem is to move the wedges inside a plate, so that they form edges of power-law slots within the plate. The present paper reports the results of the experimental investigations into the effects of such slots on damping flexural vibrations. The obtained experimental results show that introducing power-law profiled slots within plates represents an effective method of damping flexural vibrations, which is comparable with the method using power-law wedges at plate edges. (C) 2016 The Authors. The Institution of Structural Engineers. Published by Elsevier Ltd.