锥形聚音器声传播特性研究

Study on Acoustic Propagation Characteristics of Tapered Sound Concentrator

为了研究声信号在聚音器中的传播特性与内壁损耗问题,采用理论分析和数值模拟相结合的方法.根据韦伯斯特理论和别洛夫声衰减原理,理论求解出聚音器对声压的放大倍数和内壁声损耗量.利用有限元软件,建立了锥形聚音器有限元模型,将硬声场边界条件下声压放大倍数作为研究基准,计算钢、铝、聚苯乙烯、尼龙4种声阻抗条件下聚音器内壁声损耗.结果表明,数值模拟与理论分析相吻合,研究得出材料声阻抗减小,聚音器内壁声损耗增大,对声压的放大倍数减小.

A method combined theoretical analysis and numerical simulation is designed,in order to study the propagation characteristics of acoustic signals in the sound concentrator and the inner wall loss.The amplification times of sound pressure and the loss of inner wall sound are solved theoretically,according to Webster’s theory and Belov’s theory of sound attenuation.The cone shaped sound concentrator is established based on the finite element software,the sound loss of the inner wall of the concentrator of the steel,aluminum,polystyrene and nylon is calculated under the boundary condition of hard sound field.The cone shaped sound concentrator is established based on the finite element software,the sound loss of the inner wall of the concentrator of the steel,aluminum,polystyrene and nylon is calculated under the boundary condition of hard sound field.