非线性磁式压电振动能量采集系统建模与分析

发布时间：2019-06-12 20:59

【摘要】：为便于评价、优化磁式压电振动能量采集系统的性能,系统研究了该类系统的建模与分析方法,建立了非线性的分布参数模型用于描述系统的非线性动力学行为,并采用谐波平衡法给出了谐波响应的解析解.随后利用仿真模型分析了磁铁间距、加速度幅值、负载阻抗对输出功率的影响,比较了不同激励频率和加速度幅值下的最优阻抗.结果表明:双稳态特性适用于低强度的振动环境,且愈接近临界区域,输出功率愈高,而单稳态渐硬特性适用于高强度振动环境,其最优间距并不靠近临界区域;阱间大幅运动和阱内小幅运动均存在高低能量态共存的现象,愈接近临界区域,现象愈明显;激振频率是影响最优负载阻抗的决定性因素.
[Abstract]:In order to evaluate and optimize the performance of magnetic piezoelectric vibration energy acquisition system, the modeling and analysis method of this kind of system is studied systematically, and the nonlinear distributed parameter model is established to describe the nonlinear dynamic behavior of the system, and the analytical solution of harmonic response is given by using harmonic balance method. Then the effects of magnet spacing, acceleration amplitude and load impedance on the output power are analyzed by using the simulation model, and the optimal impedance under different excitation frequency and acceleration amplitude is compared. The results show that the bistable characteristic is suitable for the low intensity vibration environment, and the closer it is to the critical region, the higher the output power is, while the unistable hardening characteristic is suitable for the high intensity vibration environment, and the optimal spacing is not close to the critical region. The large motion between wells and the small motion in the well exist the phenomenon of coexistence of high and low energy states, and the closer it is to the critical region, the more obvious the phenomenon is. The excitation frequency is the decisive factor affecting the optimal load impedance.
【作者单位】：西北工业大学自动化学院;
【基金】：国家自然科学基金(批准号:50905140) 陕西省自然科学基础研究计划(批准号:2012JQ7003) 长安大学高速公路筑养装备与技术教育部工程中心开放基金(批准号:2013G1502054)资助的课题~~
【分类号】：TM619

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