Control of vibration in a plate using active acoustic black holes
Control of vibration in a plate using active acoustic black holes
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DOI：
10.1088/1361-665x/ac51ae
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发表时间：
2022-02
影响因子：
4.1
通讯作者：
K. Hook;J. Cheer;S. Daley
中科院分区：
文献类型：
--
作者：
K. Hook;J. Cheer;S. Daley
声黑洞（ABHs）是一种结构特征，可以嵌入到板中以提供有效的结构阻尼。然而，嵌入式ABH的性能受到其尺寸的限制，这决定了ABH的导通频率。增加ABH的尺寸来降低其接通频率并不总是可行的，然而，以前的工作表明，主动振动控制可以用来提高ABH波束终端的低频性能。本文提出了一项研究，通过对嵌入在平板中的ABHs阵列实施主动控制，实现主动ABHs阵列（AABHs），可以实现潜在的性能优势。本文通过实验研究探讨了潜在的性能优势，在嵌入式ABHs板和定厚板上分别应用了不同配置的被动和主动控制处理。智能结构利用压电片来实现控制驱动，并采用主动前馈多通道振动控制策略，旨在最大限度地减少由一系列加速度计监测的结构响应。根据结构响应的衰减和所需的能量或控制努力来评估每种板配置的性能。实验结果表明，与等厚板配置相比，aabh在ABH接通频率以上提供了相当大的被动阻尼，并显着减少了所需的控制工作量。
Acoustic black holes (ABHs) are structural features that can be embedded into plates to provide effective structural damping. However, the performance of an embedded ABH is limited by its size, which determines the ABH cut-on frequency. It is not always practicable to increase the size of an ABH to reduce its cut-on frequency, however, previous work has shown that active vibration control can instead be used to enhance the low frequency performance of an ABH beam termination. This paper presents an investigation into the potential performance benefits that can be achieved by implementing active control into an array of ABHs embedded in a plate, realising an array of active ABHs (AABHs). The potential performance advantage is investigated here through experimental investigations, where different configurations of passive and active control treatments are applied to both a plate with embedded ABHs and a constant thickness plate. The smart structures utilise piezoelectric patches to realise the control actuation and employ an active feedforward multichannel vibration control strategy that aims to minimise the structural response monitored by an array of accelerometers. The performance of each plate configuration is evaluated in terms of the attenuation in the structural response and the energy, or control effort required. The presented experimental results demonstrate that, compared to the constant thickness plate configuration, the AABHs provide considerable passive damping above the ABH cut-on frequency and significantly reduce the required control effort.