簧片式电磁振动台波形失真特性分析  

Analysis of waveform distortion characteristics of reed type electromagnetic vibrator

作　　者：胡天恩 张旭飞 兰媛 HU Tian’en;ZHANG Xufei;LAN Yuan(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;MOE Key Lab of Advanced Transducers and Intelligent Control System,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,太原030024 [2]太原理工大学,新型传感器与智能控制教育部和山西省重点实验室,太原030024

出　　处：《振动与冲击》2021年第21期179-184,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51805360);山西省应用基础研究计划项目(201801D221229);山西省高等学校科技创新项目(201802048);中国博士后科学基金资助项目(2019T120196,2018M640249);山西省专利推广实施资助专项(20200703)。

摘　　要：低频电磁振动台输出的大行程激励信号会受回复弹簧刚度非线性的影响,产生严重的谐波失真。为此,在电磁振动台机电耦合简化模型基础上,通过将簧片式回复结构非线性刚度简化为有限阶幂级数,分析得到刚度非线性导致振动波形失真机理;然后,通过Simulink仿真平台分析选定簧片结构可知,振动行程(簧片形变量)的增加及频率的降低均使刚度非线性特性及对应的波形失真增大。最后,试验测试得到电磁振动台的非线性刚度特性及不同频率、幅值输出信号失真度值,通过与仿真数据对比,验证了理论计算及仿真分析的正确性。研究成果可为设计低波形失真电磁振动台及提高振动传感器校准精度提供理论及试验依据。The large-stroke excitation signal of low frequency electromagnetic vibrator can be affected by nonlinearity of recovery spring stiffness to produce serious harmonic distortion.Here,based on the simplified model of electromagnetic vibrator with electro-mechanical coupling,the nonlinear stiffness of reed type recovery structure was simplified to finite order power series,and the distortion mechanism of vibration waveform due to nonlinear stiffness was obtained through analysis.Then,through Simulink simulation platform analysis,reed structure was selected,and it was shown that increasing vibration stroke,i.e.,reed deformation,and decreasing frequency make stiffness nonlinear characteristics and the corresponding waveform distortion increase.Finally,nonlinear stiffness characteristics of the electromagnetic vibrator and distortion values of output signals with different frequencies and amplitudes were obtained using tests.The correctness of the theoretical calculation and simulation analysis was verified by comparing testing data with simulation ones.It was shown that the study results can provide theoretical and test bases for designing low waveform distortion electromagnetic vibrator and improving calibration accuracy of vibration sensors.

关 键 词：电磁振动台 簧片 非线性刚度 波形失真 低频 

分 类 号：TH113[机械工程—机械设计及理论] TB936[一般工业技术—计量学]