振动发电机的系统建模与频率特性分析

发布时间：2018-02-05 19:55

本文关键词： 两自由度模型系统响应非线性频率特性振动发电　出处：《电工电能新技术》2017年11期 　论文类型：期刊论文

【摘要】：采用两自由度振动模型对振动发电机进行描述,由于非线性磁力的影响,该模型表明电磁式振动发电机是非线性非自治系统。基于该模型,对正弦振动激励下的系统响应进行仿真分析,结果表明,动子与定子的相对位移响应出现了明显的倍频现象,而输出电动势的频率分布更加复杂,不但有对应激励频率的主振动解和亚谐振动解,而且还有对应固有频率的亚谐振动解和超谐振动解,表明系统具有较强的非线性,且随着输入振动能量增大,系统的非线性特征更加明显。在10Hz正弦振动激励下的测试发现,输出电动势的幅频特性在10Hz、20Hz和30Hz处出现峰值,表明输出电动势出现了明显的倍频信号,实验结果与仿真结果的频率特性一致。
[Abstract]:A two-degree-of-freedom vibration model is used to describe the vibration generator. Due to the influence of nonlinear magnetic force, the model shows that the electromagnetic vibration generator is a nonlinear non-autonomous system. The simulation analysis of the system response under sinusoidal vibration shows that the relative displacement response between the rotor and the stator has obvious frequency doubling phenomenon, and the frequency distribution of the output EMF is more complex. There are not only the main vibration solutions and sub-harmonic vibration solutions corresponding to the excitation frequency, but also the sub-harmonic vibration solutions and the ultra-harmonic vibration solutions corresponding to the natural frequencies. It shows that the system has strong nonlinearity and increases with the input vibration energy. The nonlinear characteristics of the system are more obvious. The amplitude and frequency characteristics of the output EMF are found to be peak at 10Hz and 30Hz under 10 Hz sinusoidal vibration excitation. It is shown that the output EMF has obvious frequency doubling signal, and the experimental results are in agreement with the simulation results.
【作者单位】：电磁场与电器可靠性省部共建重点实验室河北工业大学电气工程学院;河北工业大学机械工程学院;
【基金】：国家自然科学基金项目(51107030) 河北省自然科学基金项目(E2012202070) 国家留学基金项目(201506705007)
【分类号】：TM31

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