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针对一种新型悬浮振子式中耳植入助听装置,分析了其振子的驱动电压特性,该振子由0.7Pb (Mg1/3Nb2/3)O3-0.3PbTiO3(PMN-30%)叠堆实现.为了辅助分析,建立了听骨链与振子的简化耦合力学模型.首先利用逆向成型技术建立了人体中耳有限元模型,其可靠性通过镫骨底板的位移模拟值与实验测得数据对比得以验证;然后利用该中耳有限元模型分析了振子绑定装置处的位移阻抗特性,并基于此建立听骨链与绑定装置的等效力学模型;最后建立了听骨链与压电悬浮振子的耦合力学模型,分析了该振子的驱动电压特性.研究结果表明:振子所需驱动电压随着频率的增大而减小;在语音频段,所需的最大驱动电压为20.9V;在感音神经性听力损伤多发生的中高频段,该驱动电压不高于3.8V,满足中耳植入式助听装置低电压、低能耗的要求.
A new type of suspension-type middle ear implant hearing aid was designed and its drive voltage characteristics were analyzed. The oscillator is composed of 0.7Pb (Mg1 / 3Nb2 / 3) O3-0.3PbTiO3 (PMN-30%) stack. In order to assist the analysis, a simplified coupling mechanics model of ossicular chain and vibrator was established.First, the finite element model of the human middle ear was established by using reverse forming technique, the reliability of which was verified by comparison with experimental data Then, using the finite element model of the middle ear, the impedance characteristics of the transducer at the binding device were analyzed. Based on this, the equivalent mechanical model of the ossicular chain and the binding device was established. Finally, the ossicular chain and piezoelectric vibrator Coupled mechanical model to analyze the driving voltage characteristics of the oscillator.The results show that: the driving voltage required for the oscillator decreases with the increase of the frequency; in the voice frequency band, the maximum required driving voltage is 20.9V; in the sensorineural nerve Sexual hearing impairment occurred in the high frequency band, the driving voltage is not higher than 3.8V, to meet the middle ear implantable hearing aid low voltage, low energy requirements.