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目的设计一种具有位移放大结构的压电振子改进方案,用于降低现有砧骨激励式人工中耳压电叠堆振子的功耗。方法首先,基于人耳解剖结构,设计带有位移放大结构和仅仅由压电叠堆构成的两种压电振子,并建立相应压电振子与中耳的耦合力学模型。通过对比该两种耦合力学模型的计算结果,分析引入位移放大结构前后的人工中耳听力补偿性能及功耗。结果引入位移放大结构后,压电振子在10.5 V有效电压驱动下,在1 kHz频率处的等效声压级由之前的100 dB增大至113 dB。此外,由压电叠堆直接激振时,振子在1、2和4 kHz处的功耗分别为6.42、1.56和0.28 mW;引入位移放大结构后,压电振子对应上述3个频率点的功耗分别降低至0.39、0.09和0.01 mW。结论所设计的带有位移放大结构的压电振子能够提高砧骨激励式人工中耳的听力补偿能力,有效降低压电振子的功耗。研究结果将有助于人工中耳结构设计的进一步完善,从而达到更好的听力补偿效果。
Aim To design an improved piezoelectric vibrator with displacement amplifying structure to reduce the power consumption of the existing incoherent artificial middle-ear piezoelectric stack oscillator. Methods Firstly, based on the anatomy of the human ear, two kinds of piezoelectric vibrators with displacement amplifying structure and only piezoelectric stack were designed and the coupling mechanics model of the corresponding piezoelectric vibrator and middle ear was established. By comparing the calculation results of the two coupling mechanics models, the hearing compensation performance and power consumption of the artificial middle ear before and after the introduction of the displacement amplification structure are analyzed. Results With the displacement amplifying structure, the equivalent sound pressure level at 1 kHz increased from the previous 100 dB to 113 dB when the piezoelectric vibrator was driven at 10.5 V effective voltage. In addition, the power dissipation of the vibrator at 1, 2 and 4 kHz is 6.42, 1.56 and 0.28 mW, respectively, when excited directly by the piezoelectric stack. After the displacement amplification structure is introduced, the piezoelectric vibrator corresponds to the above three power points Consumption decreased to 0.39,0.09 and 0.01 mW respectively. Conclusion The designed piezoelectric vibrator with displacement amplification structure can improve the hearing compensation capability of ankle-stimulating artificial middle ear and effectively reduce the power consumption of the piezoelectric vibrator. The results will help to further improve the design of the artificial middle ear structure so as to achieve better hearing compensation effect.