Experimental validation of vibration damping using an Archimedean spiral acoustic black hole
Experimental validation of vibration damping using an Archimedean spiral acoustic black hole
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DOI：
10.1016/j.jsv.2019.07.004
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发表时间：
2019-10-27
影响因子：
4.7
通讯作者：
Jeon, Wonju
中科院分区：
文献类型：
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作者：
Park, Seongmin;Kim, Minkyu;Jeon, Wonju
声学黑洞（ABH）是一种具有幂律分布的直楔形结构，可以有效地实现薄结构中的振动阻尼。然而，由于空间限制，直接ABH很难应用到工业系统中。在这项研究中，我们表明，当 ABH 的安装空间有限时，基线卷成阿基米德螺旋配置的螺旋 ABH 可以作为直 ABH 的替代品。螺旋ABH通过线切割放电加工制造，其阻尼性能经过实验验证。实验表明，与参考均匀梁相比，共振峰值大幅降低，表明螺旋ABH有效降低了梁结构中的结构振动。将基线滚动到螺旋曲线会导致特征频率偏移，但螺旋 ABH 和直 ABH 之间的阻尼性能几乎没有差异。我们通过增加螺旋长度进一步提高性能，并通过减小螺旋间隙距离来减小螺旋的整体尺寸。螺旋ABH有望成为将ABH应用于实际问题（例如各种机械系统中的阻尼振动）的解决方案。 (C) 2019 Elsevier Ltd. 保留所有权利。
Vibration damping in a thin structure can be effectively achieved by using an acoustic black hole (ABH), which is a straight wedge-shaped structure with power-law profile. However, it is difficult to apply the straight ABH to industrial system due to space limitations. In this study, we show that a spiral ABH whose baseline is rolled into an Archimedean spiral configuration can be an alternative for the straight ABH when an installation space for the ABH is limited. The spiral ABH is manufactured through a wire electric discharge machining, and its damping performance is validated experimentally. The experiments show large reductions of resonance peaks when compared to a reference uniform beam, indicating that the spiral ABH effectively reduces the structural vibration in the beam structure. Rolling the baseline into the spiral curve causes eigen-frequency shifts, but there is little difference in the damping performance between the spiral ABH and straight ABH. We further enhance the performance by increasing the spiral length and decrease the overall size of the spiral by reducing the spiral gap distance. The spiral ABH is expected to be a solution to apply the ABH to real-world problems such as damping vibration in various mechanical systems. (C) 2019 Elsevier Ltd. All rights reserved.