随动压电磁耦合能量采集器的组合共振分析  

Combined resonance analysis of a servo piezoelectric-magnetic coupled energy harvester

作　　者：石慧荣[1] 左存胜 高全福[1] SHI Huirong;ZUO Cunsheng;GAO Quanfu(School of Mechatronic Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学机电工程学院,兰州730070

出　　处：《振动与冲击》2024年第3期209-217,226,共10页Journal of Vibration and Shock

基　　金：甘肃省重点研发计划(20YF8GA040);甘肃高等学校创新基金(2021B-106);中央引导地方科技发展资金(22ZY1QA005);甘肃省教育厅优秀研究生创新之星项目(2021CXZX-507)。

摘　　要：压电磁耦合能量采集器能够实现较宽频带振动能量转化,但输出功率受激励方向影响较大,为使能量采集器实时获取较大机械能,设计了一种利用摆锤惯性力实时调整压电悬臂梁和磁铁相对位置的新型能量采集装置,通过对其运动特性分析,利用能量法建立了系统的动力学模型,并应用多尺度法和数值计算方法对系统进行求解,分析了外加激励作用下系统的组合共振特性,讨论了外加激励幅值、磁铁间距、摆臂长度、悬臂梁长度和宽度对有效采集频带宽度和输出电压的影响规律。结果表明:摆臂能够使系统在较大加速度激励下获取较高的机械振动幅值,并有效拓展能量采集频带;同时改变磁铁间距、摆臂长度和悬臂梁结构参数可有效提升能量采集性能。Piezoelectric-magnetic coupled energy harvester can realize a wide frequency band vibration energy conversion,but its output power is more largely affected by excitation direction.Here,to make energy harvester obtain larger mechanical energy in real time,a new type energy harvesting device was designed by using inertia force of pendulum bob to adjust relative position of piezoelectric cantilever beam and magnet in real time.Through analyzing its motion characteristics,the dynamic model of the device was established using the energy method.The multi-scale method and numerical calculation method were applied to solve the device,and analyze combined resonance characteristics of the device under external excitation.Effects of external excitation amplitude,magnet spacing,swing arm length,cantilever beam length and width on effective harvesting frequency band width and output voltage were discussed.The results showed that swing arm can make the device obtain higher mechanical vibration amplitude under larger acceleration excitation,and effectively expand energy harvesting frequency band;simultaneously changing magnet spacing,swing arm length and cantilever beam structural parameters can effectively improve the device’s energy harvesting performance.

关 键 词：压电 磁耦合 能量采集器 多尺度法 

分 类 号：TH113.1[机械工程—机械设计及理论] O322[理学—一般力学与力学基础]