激励环境下悬臂梁式压电振动发电机性能分析

Performance Analysis on Incentive Environment of Micro Cantilever Piezoelectric Vibration Generator

为了提高有限体积内压电振动发电机的发电能力,针对外力和位移激励环境,通过数学模型及ANSYS仿真分析了单、双晶压电发电机结构参数与输出电压及谐振频率之间的关系并进行了实验验证。研究结果表明,在外力激励环境下,应尽量增加压电梁的长度,减小宽度;在位移激励环境下,应尽量降低压电梁的长度。同时,在两种激励环境中,均应优先选用小厚度比的双晶压电梁。

For improving piezoelectric cantilever generator generating capacity under given dimension,aiming at external force and displacement incentive environment,relations between structural parameter and generating capacity and resonant frequency of unimorph and bimorph piezoelectric generator were analyzed by mathematical model and ANSYS finite element simulation,and the results were validated by experiment.The results show that on external force incentive environment,cantilever＇s length should be as increase as possible and width should be as decrease as possible;on displacement incentive environment,cantilever＇s length should be as decrease as possible.Meanwhile,bimorph piezoelectric generator with low thickness ratio should be selected at first on external force and displacement incentive environment.