A new type of double direction piezoelectric energy harvesting device is studied

which simplifies structure of vibration pick up and is suitable for productization of piezoelectric energy harvesting devices. The structure of bi-directional piezoelectric energy harvester is designed by using a rectangular piezoelectric wafer and a cantilever beam structure. The influence of additional mass on electricity generation performance of piezoelectric energy harvester is studied. The experimental results show that electricity generation performance of a new type of bi-direction piezoelectric energy harvesting device under different ambient excitation is studied. The results show that the natural frequency of the piezoelectric vibrator is inversely proportional to additional mass of free-end

while additional mass of main and auxiliary piezoelectric vibrator is selecting

according to frequency range of external environment excitation select the additional mass is the most easiest to stimulate which resonance of the piezoelectric vibrator to make the main and auxiliary piezoelectric vibrators respectively generate resonance with the excitation frequency

realize the maximum power generation.