编码结构的高频声场屏蔽效应研究

Investigation on Screening Effect of Coding Structure in High Frequency Acoustic Field

设计了一种基于编码结构的圆柱体空腔,在墙体透射与隔声理论分析和物理建模的基础上,利用有限元分析,发现该结构能对空气中的高频声场进行有效的隔离,当外部声压较高时,模型内部声压仅为极低,且外部声压约为内部声压25倍.同时发现,当入射激励在不同位置时,其被屏蔽的区域也不同,可以拓展至实现特定区域的声屏蔽功能.

An acoustic cylindrical cavity based on encoding structure is designed.On the basis of theoretical analysis and physical modeling of wall transmission and acoustic insulation,the finite element analysis shows that the structure can effectively isolate the high-frequency acoustic field in air,that is,When the external acoustic pressure is high,the acoustic pressure inside the model is very low,and the external acoustic pressure in the model is about 25 times of the internal acoustic pressure.At the same time,it is found that when the incident excitation is in different positions,the shielded area is also different,which can be expanded to realize the acoustic shielding function in a specific area.