Active control of sound transmission into an enclosure using structural modal filters
Active control of sound transmission into an enclosure using structural modal filters
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DOI：
10.1016/j.jsv.2018.06.012
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发表时间：
2018-09
影响因子：
4.7
通讯作者：
T. Kaizuka;Kimihiko Nakano
中科院分区：
文献类型：
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作者：
T. Kaizuka;Kimihiko Nakano
本文研究了声通过柔性结构传播到封闭空间的主动控制问题。控制系统由传感器和执行器组成，用于测量和控制柔性结构的振动，以减少声音传输。然而，由于结构模式相互有助于在外壳中的声学势能，独立地评估每个结构模式的贡献是不简单的。因此，不清楚应该测量和控制哪些结构模式。在本文中，一个公式来表达的贡献，从每个结构模式的声学势能通过结构模式之间的相互作用的发展。尽管该公式不是封闭形式，但它使人们能够独立地评估每个结构模式的贡献。一旦高贡献的结构模式被识别，这些结构模式可以独立地测量和控制，而不会溢出到其他结构模式，通过使用结构模态滤波器。结果表明，该控制方法可以有效地降低声势能，并可以避免增加的振动的柔性结构。该理论是为任意形状的外壳。最后，以矩形封闭腔为例进行了数值模拟，验证了理论的正确性。
This paper deals with active control of sound transmission through a flexible structure into an enclosed space. The control system consists of sensors and actuators used to measure and control the vibration of a flexible structure for reducing sound transmission. However, since the structural modes mutually contribute to the acoustic potential energy in the enclosure, evaluating the contribution of each structural mode independently is not straightforward. Hence, it is not clear which structural modes should be measured and controlled. In this paper, a formulation for expressing the contribution from each structural mode to the acoustic potential energy via interaction between structural modes is developed. Though the formulation is not a closed form, it enables one to evaluate the contribution of each structural mode independently. Once the highly contributive structural modes are identified, these structural modes can be measured and controlled independently without spillover to other structural modes by using structural modal filters. It is found that the proposed control method can effectively reduce the acoustic potential energy and can avoid an increase in the vibration of the flexible structure. The theory is developed for an arbitrarily-shaped enclosure. A numerical simulation for a rectangular enclosure is also conducted to verify the theory.