针对大行程低频电磁振动台气隙磁感应强度参数非线性导致振动激励信号产生失真的问题,在电磁振动台机电耦合模型分析基础上,采用电路等效原理建立大行程磁路简化数学模型,并基于Ansys Maxwell软件对气隙磁感应强度的非均匀分布特性进行仿真分析。基于连续混合整数非线性规划算法,分别仿真分析不同内磁轭母线轮廓及端面结构非线性参数对应的气隙磁感应强度分布特性,得到具有最小不均匀度的变气隙及变截面磁路最优解。仿真结果表明:变气隙和变截面结构分别将优化前25.95%的不均匀度降低到7.09%和2.70%,变截面结构具有更好的优化效果。设计的优化磁路结构可有效改善大行程低频电磁振动台气隙磁感应强度的非线性,降低输出振动信号的失真度,提高低频振动校准精度。
Abstract
Aiming at the vibration excitation signal distortion problem caused by nonlinearity of air gap magnetic induction intensity of large stroke low-frequency electromagnetic vibrator, a simplified large stroke magnetic circuit mathematical model is established based on the electromechanical coupling model analysis of electromagnetic vibrator and circuit equivalence principle. And the non-uniform distribution characteristics of air gap magnetic induction intensity are simulated and analyzed based on ANSYS Maxwell software. Based on the continuous mixed integer nonlinear programming algorithm, the distribution characteristics of air gap magnetic induction intensity corresponding to different nonlinear parameters of inner yoke outline and end face structure are simulated and analyzed respectively, and the optimal solutions of variable air gap and variable cross-section magnetic circuit with minimum nonuniformity are obtained. The simulation results show that the non-uniformity of 25.95% before optimization is reduced to 7.09% and 2.70% respectively. The optimized magnetic circuit structure can effectively improve the nonlinearity of air gap magnetic induction intensity of large stroke low-frequency electromagnetic vibrator, reduce the distortion of output vibration signal and improve the accuracy of low-frequency vibration calibration.
关键词
计量学 /
磁感应强度 /
变气隙优化 /
变截面优化 /
电磁振动台
Key words
metrology /
air gap magnetic induction intensity /
variable air gap optimization /
variable cross-section optimization /
electromagnetic vibrator
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基金
国家自然科学基金(51805360); 高端工程机械智能制造国家重点实验室开放基金(HT059-2019); 中国博士后科学基金(2019T120196; 2018M640249)
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