设计了一种采用3个结构尺寸不同的压电振子进行电信号-音频信号转换的三分频式压电骨传导助听装置，该装置可以适应较宽的工作频率范围。对压电振子进行了模态仿真分析和谐响应仿真分析，得出了压电振子最佳振型和谐振频率，确定了各个压电振子的工作频率段。根据仿真结果设计制作了三分频压电骨传导助听装置试验样机，对样机的幅频特性和响度进行了试验测试。结果显示: 助听装置中低频、中频和高频压电振子的最大振动幅值分别为86.08 μm、34.24 μm和1.545 μm，且处于各自振动频率段内; 低频、中频和高频压电振子在各自频段内响度最大，各频段的最大响度值依次为69.1 dB、98.3 dB和117.1 dB。由于3个压电振子同时工作时，各频段声音都能得到较好的响应，因此拓宽了声音的响应频域。

A three-frequency piezoelectric bone conduction hearing aid device was proposed. The device adopts three piezoelectric vibrators with different sizes to converse the electrical signals into audio signals, which could adapt to a wide frequency range. The modal analysis and harmonic response simulation analysis of the vibrators were conducted, the best modes and resonance frequencies of the vibrators were selected, and their operating frequency bands were determined. A prototype for three-frequency piezoelectric bone conduction hearing aid devices was designed and manufactured according to the simulation results, and its amplitude-frequency characteristics and loudness were tested. The experiments show that the maximum vibration amplitudes of the low-frequency, mid-frequency and high-frequency piezoelectric vibrators are 86.08 μm, 34.24 μm and 1.545 μm, respectively, and they appear in their respective frequency bands. At their own response frequency band, every piezoelectric vibrator's loudness is largest and the maximun values are 69.1 dB, 98.3 dB and 117.1 dB, respectively. When three piezoelectric vibrators are working at their respective bands simultaneously, the sound in each frequency band could obtain very good response, which broadens the sound response frequency domain of the hearing device.