Hearing loss in people is increasing because of a rise in the usage of wireless audio multimedia devices. Hearing aids are used as representative hearing rehabilitation devices. Bone conduction hearing aids are recommended for problems in the eardrum and middle ear. Bone conduction is classified according to the driving method into two types, electromagnetic and piezoelectric. Electromagnetic bone conduction causes skin disease and aesthetic problems due to transplantation, high power consumption, and external interference. Piezoelectric bone conduction converts electrical energy into mechanical vibrations, and the characteristics change linearly with size. However, the driving force of ear canal insertion of the piezoelectric body is limited because of the ear canal anatomy. In this paper, a piezoelectric actuator with a bridge structure inserted into the ear canal is proposed. The proposed method is that the displacement amplification ratio was derived using the formula of a bridge-type structure, and the displacement and resonance frequency were derived by finite element analysis (FEA) using different variables. The piezoelectric actuator was fabricated on the basis of FEA simulation results and verified through an artificial mastoid for stimulation in the ear canal. It is expected that the proposed piezoelectric actuator can be used in the various fields for sound and precision control.

中文翻译：

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桥式结构耳道插入式压电骨传导执行器

由于无线音频多媒体设备的使用增加，人们的听力损失正在增加。助听器被用作具有代表性的听力康复设备。对于鼓膜和中耳的问题，建议使用骨传导助听器。骨传导按驱动方式分为电磁式和压电式两种。电磁骨传导由于移植、高功耗和外部干扰而导致皮肤病和美学问题。压电骨传导将电能转化为机械振动，其特性随尺寸线性变化。然而，由于耳道解剖结构，压电体插入耳道的驱动力受到限制。在本文中，提出了一种具有插入耳道的桥结构的压电致动器。所提出的方法是使用桥式结构的公式推导位移放大比，并通过使用不同变量的有限元分析（FEA）推导位移和共振频率。压电致动器是在有限元分析仿真结果的基础上制造的，并通过用于耳道刺激的人造乳突进行​​验证。预计所提出的压电致动器可用于声音和精确控制的各个领域。位移和共振频率是通过使用不同变量的有限元分析（FEA）得出的。压电致动器是在有限元分析仿真结果的基础上制造的，并通过用于耳道刺激的人造乳突进行​​验证。预计所提出的压电致动器可用于声音和精确控制的各个领域。位移和共振频率是通过使用不同变量的有限元分析（FEA）得出的。压电致动器是在有限元分析仿真结果的基础上制造的，并通过用于耳道刺激的人造乳突进行​​验证。预计所提出的压电致动器可用于声音和精确控制的各个领域。