Experimental investigation of the acoustic black hole effect for flexural waves in tapered plates
Experimental investigation of the acoustic black hole effect for flexural waves in tapered plates
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DOI：
10.1016/j.jsv.2006.07.035
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发表时间：
2007-02-20
影响因子：
4.7
通讯作者：
Winward, R. E. T. B.
中科院分区：
文献类型：
--
作者：
Krylov, V. V.;Winward, R. E. T. B.
本文作者之一（V.V.K）最近提出并从理论上描述了一种基于“声黑洞效应”的有效方法来减少板或棒中弯曲波的边缘反射。该方法利用板或棒的厚度逐渐变化，部分被薄阻尼层覆盖，从与基本板或棒的厚度相对应的值（将被阻尼）到几乎为零。本文介绍了由一面覆有吸收层的楔形二次型钢板构成的阻尼系统的实验研究结果。对该系统中点迁移率的测量结果表明，对于被吸收层覆盖的楔形体，与未覆盖的楔形体或被覆盖的等厚度板相比，共振峰明显减少。因此，测量结果证实了弯曲波的声黑洞效应的存在，并证明了它在实践中应用的可能性。(c) 2006 Elsevier Ltd.版权所有。
An efficient method of reducing edge reflections of flexural waves in plates or bars based on the 'acoustic black hole effect' has been recently proposed and described theoretically by one of the present authors (V.V.K). The method utilises a gradual change in thickness of a plate or bar, partly covered by thin damping layers, from the value corresponding to the thickness of the basic plate or bar (which is to be damped) to almost zero. The present paper describes the results of the experimental investigation of the damping system consisting of a steel plate of quadratic shape (wedge) covered on one side by a strip of absorbing layer. The results of the measurements of point mobility in such a system show that for a wedge covered by an absorbing layer there is a significant reduction of resonant peaks, in comparison with the uncovered wedge or with the covered plate of constant thickness. Thus, the measurements confirm the existence of the acoustic black hole effect for flexural waves and demonstrate the possibility of its use in practice. (c) 2006 Elsevier Ltd. All rights reserved.