摘要
振动能量采集技术是一种非常有前途的清洁能源技术,在飞行器结构传感器网络等方面有重要应用潜景。针对低频振动能量采集技术主要存在的功率密度低、采集频带窄等问题,提了出碰振升频振动能量采集设计方案。在考虑机电耦合的前提下,建立了碰振升频采集系统的碰撞动力学模型,并对其进行了无量纲化处理。通过数值仿真,研究了不同碰撞间隙对系统输出电压和输出功率的影响,探讨了碰撞次数对电能输出改变的规律。研究结果表明:高频采集振子对低频驱动振子起到限位作用;随碰撞间隙的减小,输出电压的均方根峰值往高频方向移动,并不明显影响最大的输出电压;在碰撞发生频带,高频采集振子对总功率输出的贡献比例明显提升,约提升30%;相较于多次碰撞而言,单次碰撞更能确保电能输出的稳定性。
Energy harvesting from the vibration is one of clean energy technologies.For the vibration of low frequency,most of the existing approaches have the problem that the electrical output has low power density and narrow frequency-band.Hence,a vibro-impact frequency-up harvester design was proposed in the paper.First,the dimensionless dynamical model of the proposed device was established.Then the effects of impact gap on output voltage and power were studied.The results show that high frequency harvesting oscillator has limitation effect for the driving oscillator with the low natural frequency,and displacement response of high frequency harvester is close to zero.Besides,when the impact gap decreases,the output voltage peak of low frequency harvester shifts towards to high frequency direction,But the peak value is not affected obviously.Moreover,when the impact happens,the contribution from high frequency harvester is significantly increased by 30%,and the single impact is able to ensure the stability of the electrical output.
作者
陈春
高雪
滕汉东
CHEN Chun;GAO Xue;TENG Handong(China Oil and Gas Pipeline Network Corp,East China Branch,Yangzhou 225002,China;Aeronautical Institute,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第12期290-296,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(11502107)。
关键词
电磁式
能量采集
碰撞动力学
输出电压
输出功率
electromagnetic
energy harvesting
impact dynamics
output voltage
output power
