To solve the problem of collecting vibration energy in subway tracks,a vibration energy collection device based on piezo-electric spiral beam was designed according to the natural frequency of steel spring floating slab.The natural frequency matching be-tween the device and the steel spring floating slab was verified by finite element simulation and digital image correlation method experi-ments,and the vibration energy collection ability of the device was proved by frequency sweep test and wheel load drop test.The re-search results show that in the frequency sweep test conducted in the range of 1～100 Hz,the piezoelectric patch can generate an open circuit voltage of 13 V at the resonance frequency of the piezoelectric spiral beam vibration energy collection device,and 15 light-emit-ting diodes with a rated voltage of 1.5 V can be lit.In the wheel load drop test,the piezoelectric patch can generate an open circuit voltage of 6 V at the height of 20 mm,and 10 light-emitting diodes with a rated voltage of 1.5 V can be lit,which verifies that the de-vice can collect vibration energy in subway tracks and provide power for low-power micro sensors.
piezoelectricspiral beamsteel spring floating slabvibration energy harvestingnatural frequency
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