磁力非线性耦合的I-L组合压电梁俘能器发电性能试验研究

Here, aiming at problems of narrower energy capture frequency band and lower output of linear piezoelectric vibration energy harvester, an I-L composite piezoelectric beam energy harvester with magnetic nonlinear coupling was proposed. The energy harvester was composed of I-shaped piezoelectric beam with permanent magnet and L-shaped one. Different nonlinear magnetic coupling effects could be obtained by adjusting horizontal distance between the two permanent magnets. The test results showed that there is an optimal resistance to maximize output power of the piezoelectric energy harvesting(PEH) system; compared with the non-magnetic system, the resonance frequency of the proposed energy harvester has an obvious shift with I-type piezoelectric beam shifting to the left and L-type one shifting to the right to widen the energy capture frequency band of the system; when the excitation acceleration is 0.2g, the horizontal distance is 20 mm and the excitation frequency is 18.4 Hz, the proposed energy harvester can obtain the maximum output power of 1.2 mW.