Damping of flexural vibrations in rectangular plates using the acoustic black hole effect
Damping of flexural vibrations in rectangular plates using the acoustic black hole effect
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DOI：
10.1016/j.jsv.2010.05.019
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发表时间：
2010-10
影响因子：
4.7
通讯作者：
D. O'Boy;V. Krylov;V. Královič
中科院分区：
文献类型：
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作者：
D. O'Boy;V. Krylov;V. Královič
利用最近报道的声学黑洞效应对局部厚度根据 h(x)=εxmand m≥2 变化的板中的弯曲波反射研究了板结构中弯曲振动的减少。由于此类板（楔形物）的尖锐边缘总是在x=0之前被截断，真实反射系数相对较高，因此需要施加少量阻尼来实现振动幅度的大幅降低。本文提出了包含声学黑洞楔的板的数值模型，并预测了振动幅度。这些结果与一系列应用阻尼层的等效实验测量结果进行了比较。结论是，上述幂律楔块可以在较宽的感兴趣频率范围内用作板结构中的有效减振器。
The reduction of flexural vibration in plate structures has been investigated using the recently reported acoustic black hole effect for flexural wave reflection in plates with the local thickness varying according to h(x)=εxmand m≥2. Since sharp edges of such plates (wedges) are always truncated before x=0, the real reflection coefficients are relatively high, therefore the application of a small amount of damping is required to achieve large reductions in vibration amplitude. This paper presents a numerical model of a plate incorporating an acoustic black hole wedge, with predictions for vibration amplitudes. These are compared to equivalent experimental measurements for a range of applied damping layers. It is concluded that the above-mentioned power-law wedges can be used as effective vibration dampers in plate structures over a wide frequency range of interest.