新型声学结构的吸声特性研究

提出了赫姆霍兹共振吸声结构附加吸声材料的新型吸声结构,在插入长管的赫姆霍兹共振吸声结构表面敷贴吸声材料,对其吸声特性进行了理论分析与仿真计算。结果表明,吸声材料与吸声结构的有机结合显著提高了结构的吸声效果,拓宽了吸声频带宽度。进一步研究了不同吸声材料、吸声结构的不同组合方式等因素对该新型结构吸声特性的影响,结果表明:组合结构、优化材料有助于提高吸声系数、拓宽吸声频带。

Research on Sound Absorption Characteristics of the New Acoustic Structure

A new structure which lays sound absorption materials on the surface of Helmholtz resonator with extended necks is proposed in this paper,and then the theoretical analysis and numerical simulation of its sound absorption characteristics are done.The results show that the appropriate combination of sound absorption materials and sound absorption structures can improve the sound absorption effect,and the absorption broadband is widened.Furthermore the effects of different absorption materials and different combination modes to sound absorption characteristics of the new structure are studied.Finally,the results demonstrate that combined structure and material optimizing are good for enhancing the sound absorption coefficient and widening the sound absorption broadband.