Influence of geometrical parameters of an acoustic black hole on sound radiation
Influence of geometrical parameters of an acoustic black hole on sound radiation
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DOI：
10.1121/1.4988528
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发表时间：
2017-06
影响因子：
2.4
通讯作者：
Chenhui Zhao;M. G. Prasad
中科院分区：
文献类型：
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作者：
Chenhui Zhao;M. G. Prasad
机械结构的振动和噪声控制在许多工业系统的设计中起着重要的作用。近年来，声学黑洞（ABH）作为一种新的被动结构修改方法被发展和研究，以控制机械结构的振动和噪声。ABH通常是幂律锥形剖面，由于其波速逐渐减小到零。此外，由于波长的减小，振动能量集中在ABH的位置。幂律曲线的指数和参数定义了ABH的几何形状。本文研究了ABH几何形状对振动结构声辐射的影响。本文对含ABH的悬臂梁振动近场声辐射进行了数值计算和实验研究。
Vibration and noise control of mechanical structures play an important role in the design of many industrial systems. Recently, Acoustic Black Hole (ABH), a new passive structural modification approach to control vibration and noise from mechanical structures has been developed and studied. An ABH is usually a power-law taper profile due to which the wave velocity gradually reduces to zero. Also, the vibration energy is concentrated at the locations of ABH due to the reduction of wavelength. The exponent and parameter of the power-law curve define the geometry of an ABH. This paper presents an investigation of the influence of the geometry of ABH on the sound radiation from vibrating structures. This paper presents both numerical and experimental work on the on the near field sound radiation from vibrating cantilever beams containing ABH.