School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.
Department of Otolaryngology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, People's Republic of China.
J Acoust Soc Am. 2022 Jan;151(1):609. doi: 10.1121/10.0009313.
Many studies have investigated factors contributing to large variations in the outcomes of round-window (RW) stimulation but most have focused on the floating mass transducer (FMT). To determine whether results for the FMT hold for a fixed-type transducer (FTT), this study constructs two coupled finite element models of the transducer and the human ear that incorporate the cochlear third windows and inner structures of these two electromagnetic transducers. We use these FE models of the human ear and transducers to investigate the influence of four design parameters and coupling conditions for the transducers, i.e., the support's Young's modulus, the coupling layer's cross sectional area and Young's modulus, and the transducer's cross sectional area. The results show that an increase in the support's Young's modulus reduces the output of the FMT but increases that of the FTT. Reducing the cross sectional area and Young's modulus of the coupling layer significantly increases the low-frequency response of the FMT but slightly reduces that of the FTT. Reducing the cross sectional area of the transducer increases the output of the FMT but reduces that of the FTT. This shows that inner structures of electromagnetic transducers should be considered in the optimal design parameters and coupling conditions for RW stimulation.
许多研究已经调查了导致圆窗（RW）刺激结果存在较大差异的因素，但大多数研究都集中在浮动质量换能器（FMT）上。为了确定 FMT 的结果是否适用于固定型换能器（FTT），本研究构建了两个包含耳蜗第三窗口和这两种电磁换能器内部结构的换能器和人耳的耦合有限元模型。我们使用这两个人耳和换能器的 FE 模型来研究四个设计参数和换能器的耦合条件对其的影响，即支撑的杨氏模量、耦合层的横截面积和杨氏模量以及换能器的横截面积。结果表明，支撑的杨氏模量增加会降低 FMT 的输出，但会增加 FTT 的输出。减小耦合层的横截面积和杨氏模量会显著增加 FMT 的低频响应，但会略微降低 FTT 的低频响应。减小换能器的横截面积会增加 FMT 的输出，但会降低 FTT 的输出。这表明在 RW 刺激的最佳设计参数和耦合条件中应考虑电磁换能器的内部结构。
