带有限位器的 cut-out 带有限位器的

Vibration energy harvesting is a hot research field, and the existing research work mainly focuses on the free environmental space. In order to adapt to the extreme environment of limited and narrow space, a cut-out piezoelectric beam harvester with limiter was designed in this paper. The harvester was composed of a cut-out piezoelectric beam, two pairs of limiters and concentrated mass blocks. Based on the piezoelectric conservation relationship, the dynamics equation of the system was established. The effects of the distance of the limiter, the stiffness of the system, the external excitation amplitude and the electromechanical coupling coefficient on the frequency bandwidth, voltage and amplitude of the acquisition were analyzed by direct numerical integration method. By comparing with the linear harvester system without limiter, it is found that the acquisition frequency bandwidth, output voltage and power can be increased by reasonable limit spacing, proper stiffness, acceleration amplitude and piezoelectric coefficient. Finally, the correctness of the numerical analysis was verified by experiments.