考虑尺度效应的微振动能量采集器建模  

Modeling of a micro vibration energy harvester considering size effect

作　　者：李创业 霍睿[1,2] 王伟科 赵辰[3] LI Chuangye;HUO Rui;WANG Weike;ZHAO Chen(School of Mechanical Engineering, Shandong University, Ji'nan 250061, China;Key Lab.of High Efficiency and Clean Mechanical Manufacture (Shandong University) Ministry of Education, Ji'nan 250061, China3.62041 troops, People's Liberation Army, Xinxiang China)

机构地区：[1]山东大学机械工程学院,济南250061 [2]山东大学高效洁静机械制造教育部重点实验室,山东济南250061 [3]中国人民解放军32145部队机要科,河南新乡453000

出　　处：《振动与冲击》2019年第12期148-152,共5页Journal of Vibration and Shock

基　　金：山东省科技发展计划基金资助项目(2015GGX101006)

摘　　要：考虑尺度效应[1],引入等效杨氏模量以便于对微压电悬臂梁进行有限元建模。搭建了振动特性实验平台,验证了考虑尺度效应的微梁动力学模型准确有效。在此基础上完善了微振动能量采集器的动力学模型,设计并制备了T型Si悬臂梁振动能量采集器。通过实验测试得到采集器的谐振频率、尖端位移和输出电压,与有限元分析结果相比较,改进模型比宏观模型的误差降低了13%,35%和22%。Young's modulus changes in micro world with size effect.Considering this,a micro piezoelectric cantilever beam was analyzed by ANSYS.A vibration characteristics experimental platform was established.Considering size effect,the dynamic equation of the micro beam was studied.Results show that it is accurate.The dynamic model of micro vibration energy harvester was improved based on that.A T-type micro vibration energy harvester was designed and fabricated.Resonant frequency,tip displacement and output voltage of the harvester were obtained.Comparing with the macroscopic model of vibration harvester,the improved model reduces errors by 13%,35%,and 22%.

关 键 词：尺度效应 能量采集器 建模 微压电悬臂梁 

分 类 号：TH825[机械工程—仪器科学与技术]