【作者】 魏智； 张辉； 张淑仪； 范理；

【Author】 WEI Zhi;ZHANG Hui;ZHANG Shu-yi;FAN Li;Key Lab of Modern Acoustics, Institute of Acoustics, Nanjing University;

【机构】 南京大学声学研究所近代声学实验室；

【摘要】 对于声波控制而言,由于声学器件的尺寸限制,声波的频率越低则越难于调控。局域共振的引入为调控低频声波提供一种方法。但是局域共振只能在共振频率附近很窄的范围内起作用,这并不适于对于宽带低频声波的控制。本文主要研究多共振系统对声波传播影响,通过引入多个局域共振对宽带低频声波的传播进行调控。通过研究发现,局域共振的耦合可以展宽对低频声波的抑制频带,同时通过改变耦合结构的参量可以对抑制频带进行调控。更多还原

【Abstract】 For the sound wave control, it becomes difficult for regulating the sound with low frequency due to the size limitation of the acoustic device. Local resonance is introduced to provide a method for the regulation of the sound with the low frequency. However, the local resonance is excited in a narrow range at the vicinity of the resonance frequency, which is not suitable for broadband sound waves. In this paper, we mainly study the effect of multi resonance system on sound propagation, and control the propagation of broadband low frequency sound waves by introducing a number of local resonance. The results show that the coupling of local resonances can broaden the frequency band for regulating sound. Also, the suppression frequency band can be obtained by changing the parameters of the coupling structure.更多还原