摘要
针对双晶片悬臂梁式压电振子的理论模型,分析了压电振子的结构参数对压电发电装置发电能力的影响。运用ANSYS有限元软件建立了压电振子的压电耦合模型,研究了压电振子的配重质量、悬臂梁长度和金属基板厚度等结构参数对压电振子的固有频率以及压电发电装置发电量的影响规律。为了验证有限元模型的正确性,对典型结构参数压电悬臂梁的一阶固有频率和发电电压进行了实验测量。仿真结果表明,增加悬臂梁的配置质量和长度、减小悬臂梁基板的厚度都可以降低结构的固有频率,选择恰当的结构参数匹配可以使发电装置的固有频率接近外界的激振频率,从而实现最佳的发电性能。
Based on the theoretical model of the piezoelectric vibrator in piezoelectric bimorph cantilevers,the influence of piezoelectric vibrator structural parameters on the generating capacity of the piezoelectric generating device is analyzed.The electro-mechanical coupling model of the piezoelectric vibrator is established using ANSYS software to simulate the effects of structural parameters of the piezoelectric vibrator,such as block mass,cantilever length,and cantilever thickness,on the natural frequency and generating capacity.In order to verify the validity of the FEA model and compare it with the numerical results,the natural frequency and generating voltage of the piezoelectric cantilever with typical structural parameters are tested.The numerical results show that the structural natural frequency decreases as block mass and cantilever length are increased,and cantilever thickness is reduced.When the natural frequency of the piezoelectric vibrator with the matching parameters is close to the outside exciting frequency,the performance of the piezoelectric generating device can achieve optimal value.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第4期658-663,776,共6页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51275447)
关键词
压电发电
双晶压电悬臂梁
压电振子
压电耦合模型
发电能力
仿真分析
piezoelectric generator
piezoelectric bimorph cantilever
piezoelectric vibrator
piezoelectric coupling model
generating capacity
simulation analysis
