Piezoelectric vibration energy harvester and design method thereof

A piezoelectric vibration energy harvester, comprising:

• a first support plate, a second support plate, a bottom plate, a piezoelectric bimorph cantilever, a rolling part, a printing raceway and a preloading spring;
• wherein the first support plate and the second support plate are vertically disposed on the bottom plate;
• wherein an end of the piezoelectric bimorph cantilever is fixed on a surface of the first support plate, and another end of the piezoelectric bimorph cantilever is fixedly connected with the rolling part;
• wherein an end of the preloading spring is fixed on a surface of the second support plate, and another end of the preloading spring is movably connected with a back surface of the printing raceway;
• wherein a surface of the printing raceway is in contact and coupled with the rolling part, the surface of the printing raceway is a surface of the printing raceway opposite to the back surface of the printing raceway, a surface shape of the printing raceway is determined by positions and numbers of preselected equilibrium points, and the printing raceway is configured to provide the preselected equilibrium points and potential energy wells.