Vibration damping using a spiral acoustic black hole.
Vibration damping using a spiral acoustic black hole.
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DOI：
10.1121/1.4976687
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
Jae Yeon Lee;W. Jeon
中科院分区：
文献类型：
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作者：
Jae Yeon Lee;W. Jeon
本研究从一个简单的问题开始：是否可以使用占用小空间的轻质结构有效地降低板或梁的振动？作为一种有效的阻尼振动技术，声学黑洞（ABH）的概念被采用与一个简单的几何形状的修改。ABH的原始形状是具有幂律厚度的直楔形轮廓，随着ABH长度的增加，梁或板中的振动减小。然而，在实际应用中，由于空间的限制，存在ABH长度的上限。因此，在这项研究中，作者提出了一个曲线形状的ABH使用简单的数学几何的阿基米德螺旋，它允许一个均匀的间隙距离相邻基线之间的螺旋。在数值模拟中，阻尼性能随着阿基米德螺线弧长的增加而增加，而不管中高频范围内螺线的曲率如何。向ABH添加阻尼材料也可以在不显著增加重量的情况下强烈增强阻尼性能。此外，螺旋ABH的辐射声功率与标准ABH的辐射声功率相似。
This study starts with a simple question: can the vibration of plates or beams be efficiently reduced using a lightweight structure that occupies a small space? As an efficient technique to damp vibration, the concept of an acoustic black hole (ABH) is adopted with a simple modification of the geometry. The original shape of an ABH is a straight wedge-type profile with power-law thickness, with the reduction of vibration in beams or plates increasing as the length of the ABH increases. However, in real-world applications, there exists an upper bound of the length of an ABH due to space limitations. Therefore, in this study, the authors propose a curvilinear shaped ABH using the simple mathematical geometry of an Archimedean spiral, which allows a uniform gap distance between adjacent baselines of the spiral. In numerical simulations, the damping performance increases as the arc length of the Archimedean spiral increases, regardless of the curvature of the spiral in the mid- and high-frequency ranges. Adding damping material to an ABH can also strongly enhance the damping performance while not significantly increasing the weight. In addition, the radiated sound power of a spiral ABH is similar to that of a standard ABH.