基于压电螺旋梁的地铁浮置板振动能量收集装置

Vibration Energy Harvesting Device of Subway Floating Slab Based on Piezoelectric Spiral Beam

为解决地铁轨道中振动能量的收集问题,根据钢弹簧浮置板的固有频率,设计了一种基于压电螺旋梁的振动能量收集装置。通过有限元仿真和数字图像相关法试验验证了该装置与钢弹簧浮置板的固有频率匹配情况,并利用扫频试验和落轴试验证明该装置具有振动能量收集能力。研究结果表明,在1~100 Hz范围进行扫频试验,在压电螺旋梁振动能量收集装置共振频率点处,压电片可产生13 V的开路电压,并点亮15个额定电压为1.5 V的发光二极管,落轴试验在落轴高度为20 mm处压电片可产生6 V的开路电压,并点亮10个额定电压为1.5 V的发光二极管,验证了该装置可实现地铁轨道中振动能量的收集,并为低功耗微型传感器供电。

To solve the problem of collecting vibration energy in subway tracks,a vibration energy collection device based on piezoelectric spiral beam was designed according to the natural frequency of steel spring floating slab.The natural frequency matching between the device and the steel spring floating slab was verified by finite element simulation and digital image correlation method experiments,and the vibration energy collection ability of the device was proved by frequency sweep test and wheel load drop test.The research 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-emitting 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 device can collect vibration energy in subway tracks and provide power for low-power micro sensors.