An L type broadband piezoelectric energy harvesting device was proposed in this paper, and the finite element model of L-type piezoelectric vibrator is established and simulated. It shows that the voltage corresponding to the first and third order resonant frequency is 0.06 V and 0.183 V, respectively, although higher than that of the ordinary piezoelectric vibrator, the voltage of the first mode and third mode for the piezoelectric vibrator is not close, which has little effect to broaden the bandwidth. Consequently, the simulation model for multi-cantilever piezoelectric vibrator was established, and its structural sizes were optimized, and it was obtained very close to first and third order resonant voltage, the bandwidth of the vibrator was broadened to 12.5 Hz. The multi-cantilever piezoelectric vibrator can be applied in a variety of devices for the collection of mechanical energy, and to provide a research foundation for the development of intelligent structures with self-sufficiency.

提出了一种L型宽带压电能量采集装置，建立了L型压电振动器的有限元模型并进行了仿真。结果表明，尽管与普通压电振子相比，与第一和第三阶谐振频率相对应的电压分别为0.06 V和0.183 V，但压电振子的第一模式和第三模式的电压并不接近，这对扩大带宽影响不大。因此，建立了多悬臂压电振动器的仿真模型，并对其结构尺寸进行了优化，并获得了非常接近一阶和三阶谐振电压的结果，该振子的带宽扩展至12.5 Hz。