摘要
针对压电振子输出电能在数值角度求解困难的问题,结合压电方程与几何方程,构建了求解规则形状悬臂梁式压电振子表面电荷的连续模型,通过离散电位移积分表面,基于有限元思想构建了求解不规则形状悬臂梁式压电振子在不规则低频波作用下表面电荷的离散模型,可准确获得压电振子表面电荷在波浪荷载作用下的分布与电流变化规律.典型算例分析表明:离散模型求解结果与理论解吻合良好,验证了模型的计算精度.进一步应用该模型分析了压电振子长度、厚度、宽度以及波浪频率等关键参数对发电效率的影响.
To solve the problem that the output power of piezoelectric vibrator is difficult to solve numerically,a continuous model for solving the surface charge of piezoelectric vibrator with regular cantilever beam was constructed by combining piezoelectric equation and geometric equation.A discrete model for solving the surface charge of irregular cantilever piezoelectric vibrator under the action of irregular low-frequency waves was established based on the finite element method by discretizing the integral surface of electric displacement,and the distribution of surface charge and current variation of piezoelectric vibrator under wave load can be accurately obtained.The analysis of typical examples shows that the results of the discrete model are in good agreement with the theoretical solution,which verifies the calculation accuracy of the model.Furthermore,this model was applied to analyze the influence of key parameters such as length,thickness,width and wave frequency of piezoelectric vibrator on power generation efficiency.
作者
陈明
徐业鹏
黄丹
CHEN Ming;XU Yepeng;HUANG Dan(College of Mechanics and Materials,Hohai University,Nanjing 211100,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2021年第3期481-486,共6页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家重点研发计划(2018YFC0406703)
国家自然科学基金(51679077)
中央高校基本科研业务费(2017B1303)。
关键词
波能发电
压电获能
力学建模
参数分析
wave energy power generation
piezoelectric energy harvesting
mechanical modeling
parameter analysis
