B&K4195人工耳等效电路模型修正

Modification of equivalent circuit of B&K 4195

B&K 4195人工耳原有等效电路模型的仿真结果在3 k Hz以上频段与实测相差较大,无法满足精度要求。通过有限元仿真和声阻抗转移理论的对比,对突变截面结构提出了附加质量概念,从而完善了腔管结构在较大尺寸和较高频段下的等效电路模型。根据此方法修正了人工耳耳廓部分的等效电路模型,使仿真与实测在6 k Hz前的频段内吻合较好。

The simulation results of the original equivalent circuit of B＆K 4195 artificial ear reveal a large deviation from the measurement results in the frequency band above 3 kHz, and failed to satisfy the accuracy requirements. In this paper, on the base of comparing the finite element simulation and acoustic impedance transfer theory, the concept of additional mass is proposed for the structure with abrupt cross section, thus improve the equivalent circuit model of the structure with cavity and duct in the large size and high frequency band. According to this method, the equivalent circuit model of the pinna gets improved and makes sure the simulation and experiment fit better in the frequency band above 6 kHz.