材料和尺寸参数对Rainbow型压电换能器发电能力的影响

给出了一种多方向振动能量收集装置的设计结构.为研究Rainbow型压电换能器材料、尺寸参数对其发电能力的影响,根据压电材料的机电耦合方程和对换能器的力学理论分析,建立了Rainbow型压电换能器开路电压与输出电能的数学模型.对开路电压模型进行了仿真验证,仿真结果与理论分析一致.对输出电能理论模型的数值模拟分析表明,金属基片的宽度与厚度、换能结构初始曲率半径的增大将会引起换能结构两片压电薄膜输出电能的降低;金属基片长度、压电薄膜宽度的增大将会引起两片压电薄膜输出电能的增加;压电薄膜长度、厚度的增大将会使得两片压电薄膜输出电能先增加后减小;铍青铜基片换能器要优于钢基片换能器;换能器弧形内侧压电薄膜的输出电能都要大于外侧压电薄膜.最后,结合Rainbow型压电换能器的力学分析给出了分析结果的合理解释.     

Analysis on Output Power for Multi-direction Piezoelectric Vibration Energy Harvester

To predict the performance of multi-direction piezoelectric vibration energy harvester,an equation for calculating its output power is obtained based on elastic mechanics theory and piezoelectricity theory.Experiments are performed to verify theoretical analysis.When the excitation direction is along Y direction,a maximal output power about 0.139 mW can be harvested at a resistive load of 65kΩ and an excitation frequency of 136 Hz.Theoretical analysis agrees well with experimental results.Furthermore,the performance of multi-direction vibration energy harvester is experimentally tested.The results show that the multi-direction vibration energy harvester can harvest perfect energy as the excitation direction changes in XY plane,YZ plane,XZ plane and body diagonal plane of the harvester.     

Rainbow型压电单膜片换能结构负载电压和输出功率分析

给出了一种多方向振动能量收集装置的设计结构.为研究Rainbow型压电单膜片换能结构材料、尺寸参数、负载电阻对其输出功率的影响,根据压电材料的机电耦合方程和弹性力学理论,建立了Rainbow型压电单膜片换能结构负载电压及输出功率的理论模型.对所建理论模型进行了数值计算和验证测试,理论计算结果及测试结果具有较好的一致性,...