Experimental and numerical investigations on acoustic damping of monoclinic crystalline wideband sound absorbing structures

单斜晶形宽带吸声结构声阻尼的实验与数值研究

In order to overcome the limitations of traditional microperforated plate with narrow sound absorption bandwidth and a single structure,two multi-cavity composite sound-absorbing materials were designed based on the shape of monoclinic crystals:uniaxial oblique structure(UOS)and biaxial oblique structure(BOS).Through finite element simulation and experimental research,the theoretical models of UOS and BOS were verified,and their sound absorption mechanisms were revealed.At the same time,the influence of multi-cavity composites on sound absorption performance was analyzed based on the theoretical model,and the influence of structural parameters on sound absorption performance was discussed.The research results show that,in the range of 100-2000 Hz,UOS has three sound absorption peaks and BOS has five sound absorption peaks.The frequency range of the half-absorption bandwidth(α>0.5)of UOS and BOS increases by 242% and 229%,respectively.Compared with traditional microperforated sound-absorbing structures,the series and parallel hybrid methods significantly increase the sound-absorbing bandwidth of the sound-absorbing structure.This research has guiding significance for noise control and has broad application prospects in the fields of transportation,construction,and mechanical design.

为了克服传统微孔板吸声带宽窄,结构单一的局限性,以单斜晶体的形状为灵感,设计了两种多腔复合吸声结构:单轴斜结构(UOS)和双轴斜结构(BOS)。通过有限元模拟和实验研究,验证了UOS和BOS的理论模型,并揭示了它们的吸声机理。同时,基于理论模型分析了多腔复合对吸声性能的影响,并讨论了结构参数对吸声性能的影响。研究结果表明:在100~2000 Hz范围内,UOS有3个吸声峰,BOS有5个吸声峰。UOS和BOS的半吸声带宽(α>0.5)的频率范围分别增加了242%和229%。与传统微穿孔吸声结构相比,串联和并联混合的方法显著提高了吸声结构的吸声带宽。该研究对噪声控制具有指导意义,在交通运输、建筑和机械设计等领域具有广阔的应用前景。