Purpose

Magnetic levitation vibration isolator (MLVI) is an efficient method to suppress the external oscillations transmitted to some small instruments in the laboratories.

Methods

This paper first presents a basic configuration of a kind of MLVI with four sets of the repulsive rectangular permanent magnets. Then, the parametric studies are carried out to discuss how the structure and air gap parameters influence the magnetic force, stiffness, and natural frequency of the MLVI. Moreover, as an MLVI case study, an operating point is set and the size dimensions of the MLVI are determined based on the parametric studies. The transmissibility of the MLVI is calculated by the dynamic equation at the operating point.

Results

An experimental table is constructed for the analytical validation. The experimental results proved the validity of the theoretical analysis and showed that there are good consistencies between the experiment results and the theoretical calculation, which obtains that the natural frequency of the MLVI is 4.75 Hz and the initial cut-off frequency of the MLVI is approximately 6 Hz at the operating point. When the frequency of the external oscillations reaches 16 Hz, the attenuation amplitude becomes − 20 dB.

Conclusion

All of these show ability of the proposed MLVI to attain low-frequency vibration isolation, and provide a new type of basic passive MLVI to exploit an active MLVI for practical applications.

中文翻译：

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矩形永磁磁悬浮振动器的隔振性能分析与实验

目的

磁悬浮隔振器（MLVI）是抑制传递到实验室中一些小型仪器的外部振荡的有效方法。

方法

本文首先介绍一种带有四组排斥矩形永磁体的MLVI的基本配置。然后，进行参数研究，以讨论结构和气隙参数如何影响MLVI的磁力，刚度和固有频率。此外，作为MLVI案例研究，根据参数研究确定工作点并确定MLVI的尺寸。MLVI的透射率通过工作点处的动态方程式计算得出。

结果

实验表被构造用于分析验证。实验结果证明了理论分析的正确性，表明实验结果与理论计算值吻合良好，得出MLVI的固有频率为4.75 Hz，MLVI的初始截止频率约为在工作点为6 Hz。当外部振荡的频率达到16 Hz时，衰减幅度变为− 20 dB。

结论

所有这些都表明了所提出的MLVI具有实现低频振动隔离的能力，并提供了一种新型的基本无源MLVI来为实际应用开发有源MLVI。