微型双稳态板压电俘能器的仿真研究  

THE SIMULATION OF BI-STABLE MICRO PIEZOELECTRIC ENERGY HARVESTING

作　　者：陈丽华[1,2] 景浩 陈坦 张伟 常力琦[1,2] 杨凤红 Chen Lihua;Jing Hao;Chen Tan;Zhang Wei;Chang Liqi;Yang Fenghong(Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures,Beijing 100124,China;College of Mechanical Engineering,Beijing University of Technology,Beijing 100124,China;School of Statistics and Mathematic,Central University of Finance and Economics,Beijing 100081,China)

机构地区：[1]北京工业大学机电学院,北京100124 [2]机械结构非线性振动与强度北京市重点实验室,北京100124 [3]中央财经大学统计与数学学院,北京100081

出　　处：《动力学与控制学报》2019年第6期537-545,共9页Journal of Dynamics and Control

基　　金：国家自然科学基金(11472019,11472315)~~

摘　　要：基于中间固定、四边自由的微型压电层合板模型,应用应变梯度理论考虑其尺寸效应,借助ABAQUS用户自定义子程序(UEL)模块自定义了一种三维八节点的微型压电单元.利用有限元法热-力-电耦合分析对微型双稳态板压电俘能器进行了仿真研究,发现其在不同的激振频率下存在不同的变形状态,非线性动态分析显示该结构在其一阶固有频率之前也能俘获较多电能,且存在多态转换交替出现的现象.针对该微型双稳态压电俘能器,给出了其最佳的工作频率和最大俘获电压.研究成果对微型压电俘能器的设计分析和性能检测具有重要的指导意义.A micro piezoelectric energy harvesting is designed based on a bi-stable plate that is two-layered square plates fixed in the midpoint of the plates and free at four edges.Based on strain gradient theory,considering the size effect,a micro-piezoelectric element is defined using User-defined Finite Element Subroutine(UEL)in ABAQUS.With the thermal-force-electric coupling analysis method,it is found that there are different deformation shapes under different excitation frequencies.The analysis nonlinear dynamic shows that the structure can change more vibration energy to electric energy before its first natural frequency,and there exists snap-through behavior in its frequency response range.The optimum working frequency and maximum output voltage are concluded for the micro piezoelectric energy harvesting.The research findings have an important guiding significance for design of micro piezoelectric energy harvesting.

关 键 词：微型压电俘能器 尺寸效应 应变梯度 UEL 双稳态 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]