Dynamic Performance Analysis of Hybrid Tri-stable Piezoelectric Energy Harvester
To improve the energy harvesting performance of the piezoelectric energy harvester under low external excitation level , based on the multi-stable piezoelectric cantilever energy harvester model, two elastic amplifiers were respectively installed, one was installed between the U-shaped frame and the substrate, and the other was installed between the U-shaped frame and the fixed end of the cantilever beam. Hence, a hybrid tri-stable piezoelectric energy harvester (TPEH+DEM) model was proposed. The nonlinear electro-mechanical coupling equation of the TPEH+DEM system was established by using Hamilton principle. The influences of the mass ratio and spring stiffness ratio of the two elastic amplifiers, the relative distance between the magnets, and the load resistance on the energy harvesting level of the TPEH+DEM system were analyzed. And it turned out that within a certain range of external excitation frequency, the response output power of the TPEH+DEM system had two peak value. Reasonable adjustment of the mass ratio and spring stiffness ratio of the two elastic amplifier can make the system enter inter-well motion under low external excitation intensity , and produce high output power. Compared with the traditional multi-stable piezoelectric energy harvester with only an elastic substrate, the TPEH+DEM model has better energy harvesting performance under low frequency external excitation level.
piezoelectric energy harvesterelectro-mechanical couplingelastic amplifierharmonic balance methodinter-well motion
万方数据
维普
