摘要
利用流体动能能量发电为微电子器件供电已逐渐成为非线性振动领域的研究热点。利用永磁铁产生非线性回复力,将非线性回复力引入到悬臂梁压电能量捕获装置中,提出了一种三稳态尾流驰振能量压电发电装置,获得力学模型及系统控制方程,获得了三稳态系统的稳定和不稳定平衡点表达式,给出了发电系统存在三稳态运动时的结构参数的取值范围。重点研究了等平衡点不同势阱深度、等势阱深度不同平衡点位置对系统的动力学响应及发电性能的影响。结果表明,等平衡点条件下浅阱系统的起振折合流速更低、发电性能更好。
Harvesting flow kinetic energy to power microelectronic devices has become a research hot topic in the area of nonlinear vibration dynamics.Nonlinear restoring force is provided by magnetic repulsion force of the permanent magnet.A tristable wake galloping vibration energy harvester is put forward by embedding the nonlinear restoring force in the piezoelectric cantilever and power generation system in the paper.The mechanical model and governing equations are established.The analytic expressions of stable and unstable equilibrium points are obtained.The value range of structure parameters is acquired when tristable motion occurs in the tristable wake galloping vibration energy harvester.The dynamic performance and power generation performance are studied by simulations under the condition of the equal equilibrium points with different potential well depth and the equal potential well depth with different equilibrium points.The simulation results show that the reduced velocity of the tristable wake galloping vibration energy harvester under the condition of the equal equilibrium points with shallow potential well depth is smaller than that under the condition of the equal equilibrium points with other potential well depth,so is the power generation performance.
作者
刘丽兰
吴子英
谭红波
LIU Lilan;WU Ziying;TAN Hongbo(School of Mechanical and Instrumental Engineering,Xi'an University of Technology,710048 Xi'an,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2022年第3期498-505,526,共9页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金资助项目(No.11572243)。
关键词
三稳态
尾流驰振
能量捕获
发电性能
tristable
wake galloping
energy harvesting
power generation performance
