双端固支梯形梁压电俘能器机电耦合模型与试验分析

针对环境中的低频振动能量，基于双端固支梁压电结构，建立了梯形梁压电俘能器的机电耦合振动模型，并通过试验对其进行了验证.结果显示，数学模型与试验结果相吻合.当梯形梁结构在1阶谐振（96.85 Hz）状态，且激励加速度2 m/s2时，结构单侧开路输出电压峰值可达44.43 V，最大输出功率为6.16 mW.另外，双端固支梯形梁结构与矩形梁结构的比较试验结果显示，双端固支梯形梁压电结构可以有效降低谐振频率，输出开路电压较矩形结构提高22.7%，输出最佳负载功率较矩形结构提高33.0%. 

Electromechanical Coupling Model and Experimental Analysis of Double Clamped Trapezoidal Beam Piezoelectric Energy Harvester

To deal with the low-frequency vibration energy in daily environment, the harvester''s electromechanical coupling model was made based on the piezoelectric structure with double clamped trapezoidal beam piezoelectric structure, and corresponding experiments were conducted to verify the model. The research shows that the results of the theoretical model are in good agreement with the results of the experiments. When the trapezoidal beam structure is in a state of resonance (96.85 Hz) and the acceleration is 2 m/s², open circuit output voltage is 44.43 V and the maximum output power is 6.16 mW. In addition, in order to compare double clamped trapezoidal structure and rectangular beam structure, experimental results shows that the double clamped trapezoidal beam piezoelectric structure has the function of reducing resonance frequency; compared with the rectangular structure, its output open circuit voltage increases by 22.7%, the output optimal load power increases by 33.0%.