一种腔室可调的Helmholtz型声子晶体的带隙研究

摘要/Abstract

摘要： 本文针对低频噪声的控制问题,设计了一种腔体结构可调的Helmholtz型声子晶体,该结构内腔由一活动伸缩螺杆连接的隔板分为上下两腔,并采用弓字形开口通道设计。采用有限元法对该结构的带隙特性与隔声特性进行了分析,并通过“声力类比”的方法构建了该结构在带隙起始频率与截止频率处的等效模型。研究表明,该结构在500 Hz以下频段内具有6条带隙,最低带隙频率可达31.34 Hz,且在每条带隙频段内都表现出了良好的隔声性能,最大隔声量可达111.95 dB。最后,通过调整伸缩螺杆,改变腔体结构布局,可将多条共振带隙相连,不仅可以构成一个较宽的带隙,而且可以达到调节隔声频段的目的。该设计为改善Helmholtz型声子晶体的隔声性能提供了新的设计思路。

关键词: 声子晶体, 带隙, Helmholtz腔, 隔声, 低频噪声, 腔体可调

Abstract: For low-frequency noise control problems, a Helmholtz-type phononic crystal with an adjustable chamber was constructed. The inner chamber of the structure is divided into upper and lower chambers by a diaphragm connected by a movable telescopic screw. Meanwhile, an arch-shaped opening channel is adopted. Characteristics of bandgap and sound insulation of the structure are analyzed by finite element method, and equivalent models of the structure at the starting frequency and cut-off frequency of the bandgap are constructed by “acoustic-force analogy” method. The results show that the designed structure can generate six complete bandgaps within 500 Hz, and the lowest bandgap frequency can reach 31.34 Hz. At the same time, it shows good sound insulation performance in each bandgap frequency band, and the maximum sound insulation is up to 111.95 dB. Finally, by adjusting the telescopic screw and changing the cavity structure layout, multiple resonant bandgaps can be connected to form a wide bandgap, and achieve the purpose of adjusting the sound insulation band. This design provides a new idea for the sound insulation performance of Helmholtz type phononic crystals.

Key words: phononic crystal, bandgap, Helmholtz resonator, sound insulation, low-frequency noise, adjustable chamber

中图分类号:

TB53
TH113.1

刘红, 赵静波, 姚宏, 韩东海, 张晓生, 王晨, 张广军. 一种腔室可调的Helmholtz型声子晶体的带隙研究[J]. 人工晶体学报, 2023, 52(4): 590-597.

LIU Hong, ZHAO Jingbo, YAO Hong, HAN Donghai, ZHANG Xiaosheng, WANG Chen, ZHANG Guangjun. Bandgaps of a Helmholtz-Type Phononic Crystal with Adjustable Chamber[J]. Journal of Synthetic Crystals, 2023, 52(4): 590-597.

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