抗磁稳定悬浮结构的阻尼特性研究

Study on Damping Characteristics of Diamagnetically Stabilized Levitation Structure

摘要:

本文研究一种抗磁稳定悬浮结构的涡流阻尼的阻尼特性。建立了求解涡流阻尼及阻尼系数的数学模型,借助MATLAB和COMSOL 5.6通过三维电磁场有限元仿真分析方法研究了涡流阻尼的特性以及外部激励频率、振幅、悬浮磁体厚度、导体板厚度等对涡流阻尼的影响,给出了其变化规律。结果表明：磁体半径与厚度、增大抗磁体边长和厚度以及减小悬浮间隙都可增大涡流阻尼。除此之外,增大外部激励的振幅与频率也可以增大涡流阻尼,但增大激励频率时涡流阻尼会出现相位滞后现象。该结果对于分析研究抗磁悬浮结构的振动特性具有一定的参考意义。

Abstract:

This paper studies the damping characteristics of eddy-current damping of a diamagnetically stabilized levitation structure. A mathematical model for solving eddy-current damping and damping coefficient is established. With the help of MATLAB and COMSOL 5.6, the characteristics of eddy-current damping and the influence of external excitation frequency, amplitude, thickness of floating magnet and thickness of conductor plate on eddy-current damping are studied by three-dimensional electromagnetic field finite element simulation analysis method. The results show that the eddy current damping can be increased by increasing the radius and thickness of the magnet, increasing the side length and thickness of the magnet and reducing the levitation gap. In addition, increasing the amplitude and frequency of the external excitation can also increase the eddy current damping, but the eddy current damping will appear phase lag when the excitation frequency is increased. The results have certain reference significance for analyzing the vibration characteristics of the anti-magnetic levitation structure.