论文期刊

Quantitative analysis of low frequency acoustic characteristics for reverse horn by bottleneck effect analogy method




作者: Xiao Liang, Jiu Hui Wu, Zhuo Zhou, and Zhe Chen
发表/完成日期: 2019-05-16
期刊名称: Modern Physics Letters B
期卷: Vol.33, No.16, 2019
相关文章: 梁霄_Quantitative analysis of low frequency acoustic characteristics for reverse horn by bottleneck effect analogy method.pdf   
论文简介
Reverse horn as one of the Acoustic Black Hole (ABH) structures can be used to effectively reduce low frequency acoustic waves by focusing the sound energy. The sound
waves in relatively low frequency range are focused on the tip of reverse horn, and most
sound energy cannot flow out from the reverse horn’s tip. In this paper, we propose a
quantitative analysis method by the bottleneck effect analogy to research the low frequency acoustic characteristics of reverse horn. Our theoretical results show that the
low frequency sound wave can be focused on the tip of reverse horn, and the transmission coefficient of low frequency is proportional to the 3 power law of the reverse
horn tip’s diameter. The experimental results verified our theoretical results. And the
sound insulation property is studied by experiments. It is noteworthy that the insulation
coefficient of two levels reverse horn whose second level tip’s diameter d = 12 mm, is
more than 0.92, and can increase further with the decrease of the second level horn tip’s
diameter. It provides an effective and simple method for quantitatively analyzing the
low frequency acoustic characteristics of the reverse horn. The proposed reverse horn
has great potential applications for low frequency sound insulation control.