摘要
提出了一种双稳态振动能量捕获装置,分析引起屈曲梁双稳态振动的条件,推导出非线性恢复力、平衡点位置及势阱深度与屈曲梁参数的关系式。建立减速带能量捕获装置动力学方程,利用龙格库塔法使用MATLAB对其进行仿真分析,并与传统的线性系统装置进行比较,得出双稳态系统引起了减速带的大幅度振动,可以提高54.88%的发电量。探究结构参数对装置发电特性的影响,结果表明,通过对非线性恢复力和势阱深度两个方面进行研究,发电量会随着屈曲梁长度的增大先增大,随后趋于平稳,随着屈曲梁宽度和高度的增大而持续减小;与此同时,在较小的非线恢复力作用下,减速带的高度和宽度的增大,增大了车轮对减速带的激励和振幅,从而提高能量的捕获;最后,通过对两种飞轮进行比较,发现相比于转动惯量小的飞轮,装有大飞轮的能量捕获装置更笨重,引起轴转速的减小而不利于能量的输出。
In this article a bi-stable vibration energy harvester is proposed. The analysis is conducted on those conditions which cause the bi-stable vibration of the buckling beam, and the relationship among the non-linear restoring force, the equilibrium point position, the depth of the potential well and the parameters of the buckling beam are derived. The dynamic equation of the energy harvester for the speed bump is set up;the Runge-Kutta method is used to simulate the device by means of MATLAB;compared with the traditional linear system, it is concluded that the bi-stable system causes a large vibration of the speed bump, which increases power generation by 54.88%. The analysis is conducted on the influence of structural parameters on the characteristics of power generation. These results show that by exploring the non-linear restoring force and the depth of potential well, with the ever-growing buckling beam, power generation first increases and then tends to be stable. It decreases with the ever-growing width and height of the buckling beam. In addition, with the action of a small non-linear restoring force, the height and width of the buckling beam increase, and the excitation and amplitude on the wheel upon the speed bump increases, thereby improving energy harvest. Finally, by comparing the two flywheels, it is found compared with the flywheel with a small moment of inertia, the energy harvester is equipped with a large flywheel is more bulky, which causes a reduction in shaft speed. It is not conducive to energy output.
作者
严涵
吴子英
YAN Han;WU Zi-ying(Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi’an 710000)
出处
《机械设计》
CSCD
北大核心
2021年第12期31-39,共9页
Journal of Machine Design
基金
国家自然科学基金资助项目(11572243)。
关键词
双稳态
屈曲梁
减速带
能量捕获
大幅运动
bi-stable
buckling beam
speed bump
energy harvester
mass movement
作者简介
严涵(1997-),男,硕士,研究方向:非线性振动能量俘获。E-mail:635940762@qq.com;通信作者:吴子英(1975-),男,副教授,研究生导师,博士,研究方向:机电系统动力学理论及控制。E-mail:ziyingwu@163.com。
