人工中耳悬浮式压电振子的优化设计  

Optimal design of a floating mass type piezoelectric actuator for implantable middle ear hearing devices

作　　者：田佳彬[1] 饶柱石[1] 塔娜[1] 许立富[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《振动与冲击》2015年第5期135-140,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目资助(11172168)

摘　　要：为了优化人工中耳悬浮式压电振子的植入效果,设计了一种位移放大结构用于改善振子的输出特性。首先采用微CT扫描和逆向成型技术建立了包括外耳道、中耳和简化耳蜗的人耳有限元模型,通过与文献的实验数据比对验证模型的有效性。然后建立人耳与悬浮振子的耦合力学模型,通过有限元的耦合场分析研究加入位移放大结构前后的人工中耳植入效果。研究结果表明,采用位移放大结构后,振子于中高频段的等效声压级得到明显提升,可以有效降低压电振子的功耗。To optimize the implant performance of a floating mass type piezoelectric actuator for implantable hearing devices,a displacement amplifier was designed to improve the output characteristics of the actuator. A finite element model of human ear consisting of the external ear canal,middle ear and simplified cochlea was constructed via microcomputer tomography imaging and the technique of reverse engineering. The validity of the model was verified by comparing the model-derived results with experimental data from reference. Then an ear-actuator coupled mechanical model was developed,and the multi-field coupling was considered to study the implant performance of the actuator before and after the displacement amplifier was added. The results showed that the adoption of displacement amplifier can increase the equivalent sound pressure level of the actuator in the middle and high frequency ranges,and the power consumption can effectively be reduced at the same time.

关 键 词：人工中耳 压电振子 有限元建模 位移放大结构 

分 类 号：TH785[机械工程—仪器科学与技术]