摘要
半电极含金属芯压电纤维能将环境振动通过弯曲变形转换成电能。运用分析力学方法建立了半电极含金属芯压电纤维能量收集装置的理论模型,推导了在谐波激励下,经过AC-DC转换后的归一化能量表达形式,分析了能量收集效率受金属芯与压电层的半径比、柔度系数比、压电材料的机电耦合系数及外界激励方向的影响,分析结果表明,当半径比达到2.4,材料机电耦合系数达到0.4,能量收集效率会接近相对最大值。本研究结果适用于压电纤维能量收集装置的分析与优化设计。
Half coated metal core piezoelectric fiber can harvest environment vibration energy through bending displacement.The electromechanical coupling dynamics model of half coated metal core piezoelectric fiber is established by analytical mechanics method.The analytical expressions of normalized harvest power after AC-DC transfer excited by harmonic force is derived.The power harvest efficiency affected by radius ratio,flexibility coefficient ratio of metal and piezoelectric material,electromechanical coupling coefficient and direction of excited force is investigated.The results shows while radius ratio reach 2.4or material electromechanical coupling coefficient reach 0.4,the power harvest efficiency is near the optimized value.The results can be used to design and optimize the piezoelectric fiber for power harvesting.
出处
《压电与声光》
CSCD
北大核心
2015年第1期50-53,共4页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(51005224)
关键词
半电极
金属芯
压电纤维
能量收集
half coated
metal core
piezoelectric fiber
power harvesting
