Aiming at the optimization scheme that some scholars propose that the traditional rectangular cantilever beam energy harvester should be replaced by trapezoidal one to improve the output performance of devices

influence of trapezoidal beams with different widths on various properties index of energy harvester is analyzed by theory and ANSYS finite element simulation software

and the conclusions are verified by experiments. The result shows that with the decrease of the free-end width of trapezoidal beam

surface stress distribution on the beam become more uniform

the resonant frequency of the device is decreased. and the output voltage is increased. The maximum output voltage of trapezoidal beam energy harvester is 34. 97 % higher than that of rectangular one with the same size.