本文選題：Helmholtz腔 + 聲學(xué)超材料�。� 參考：《聲學(xué)技術(shù)》2017年04期

【摘要】：為有效控制低頻寬帶噪聲,設(shè)計(jì)了一種帶薄膜結(jié)構(gòu)的Helmholtz腔聲學(xué)超材料。利用COMSOL軟件對(duì)其透射特性進(jìn)行詳細(xì)分析,結(jié)果表明:不帶膜的原本的Helmholtz腔結(jié)構(gòu)其透射系數(shù)雖在低頻范圍內(nèi)可以得到峰值,但其結(jié)構(gòu)尺寸較大,且頻帶很窄,而文中設(shè)計(jì)的聲學(xué)超材料結(jié)構(gòu)的透射系數(shù)在低頻范圍可得到多個(gè)峰值,在相同結(jié)構(gòu)尺寸下,與原本的Helmholtz腔結(jié)構(gòu)相比,其固有頻率向低頻范圍內(nèi)偏移,因而提高了結(jié)構(gòu)的低頻隔聲效果,拓寬了結(jié)構(gòu)的隔聲頻率帶寬。在此基礎(chǔ)上進(jìn)一步研究了聲學(xué)超材料結(jié)構(gòu)幾何參數(shù)對(duì)透射系數(shù)的影響,優(yōu)化了聲學(xué)超材料的結(jié)構(gòu)幾何參數(shù)。
[Abstract]:In order to control the low frequency wideband noise, an acoustic supermaterial with thin film structure for Helmholtz cavity was designed. The transmission characteristics of Helmholtz cavity without film are analyzed in detail by COMSOL software. The results show that the transmission coefficient of the original Helmholtz cavity without film can be obtained in the low frequency range, but its structure size is large and the frequency band is very narrow. The transmission coefficient of the acoustic metamaterials designed in this paper can obtain multiple peaks in the low frequency range. At the same structure size, the natural frequency of the designed acoustic supermaterial structure is shifted to the low frequency range compared with the original Helmholtz cavity structure. Therefore, the low frequency sound insulation effect of the structure is improved, and the bandwidth of the structure sound insulation frequency is widened. On this basis, the influence of structural geometric parameters of acoustic metamaterials on transmission coefficient is further studied, and the structural geometric parameters of acoustic supermaterials are optimized.
【作者單位】： 江蘇大學(xué)土木工程與力學(xué)學(xué)院;
【分類號(hào)】：TB34
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本文編號(hào)：2108918