压电悬臂梁多模态发电装置的仿真与试验  

Simulation and experiment of piezoelectric cantilever generator with multi-modal

作　　者：吴越[1] 杨志刚[1] 陈龙[1] 康晓涛[2] 张东伟[1] 

机构地区：[1]吉林大学机械科学与工程学院,长春130022 [2]吉林大学通信工程学院,长春130022

出　　处：《吉林大学学报（工学版）》2015年第4期1162-1167,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51277088);吉林省科技发展计划項目(20140101078JC);中国博士后科学基金项目(2014M551195);吉林大学'985工程'项目

摘　　要：为了解决压电悬臂梁发电装置俘获低频振动时,结构共振频率带宽小不能完全发挥其发电能力的问题,对压电悬臂梁进行模态分析,结合汽车轮胎压力检测系统中自供电的要求与悬臂梁式发电装置振动模态的特点,提出利用弯曲振动模态和扭转振动模态构成压电悬臂梁发电装置,利用分布式的质量块布置方式实现弯曲模态与扭转模态的解耦,并使用有限元方法对其进行仿真计算。仿真结果表明:在一阶弯曲模态固有频率为12.6Hz不变的条件下,通过调整质量块分布位置,将弯曲模态的固有频率降低到17.2 Hz。对改进的压电悬臂梁发电装置进行试验,结果表明其发电能力是同条件下传统的集中质量块式悬臂梁发电装置的1.4倍。The power generation capacity of piezoelectric cantilever beam generator can not fully play due to that its resonance frequency bandwidth is small when capture low-frequency variation. To overcome this problem, modal analysis of the piezoelectric cantilever beam was carried out. Combining with the requirement of self power of automobile tire pressure detection system and the characteristics of the vibration mode of the cantilever type power device, a scheme was proposed. In this scheme, the bending and torsion vibration modes were utilized to constitute the piezoelectric cantilever generator; the bending mode and torsion mode were decoupled by the distributed mass block arrangement. Finite element simulation was carried out. The simulation results show that, under the condition that the first bending mode frequency is 12. 6 Hz, by adjusting the mass block distribution, the natural frequency of the flexural mode can be reduced to 17. 2 Hz. Under the same condition, the power generation capacity of the improved piezoelectric cantilever beam generator is about 1.4 times of that of the traditional centralized mass piezoelectric cantilever beam generator.

关 键 词：机械设计 压电发电 悬臂梁 模态分析 有限元分析 

分 类 号：TH703[机械工程—仪器科学与技术]