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Analysis and Experiment of Vibration Isolation Performance of a Magnetic Levitation Vibration Isolator with Rectangular Permanent Magnets

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Abstract

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.

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Acknowledgements

This work was supported by Major Scientific and Technological Project of China National Machinery Industry Corporation Ltd (SINOMAST-ZDZX-2017-05), and National Science and Technology Major Project (2013ZX02104003) and the National Science Foundation of Hubei Province (2018CFC889) and the Scientific Project of Hubei Provincial Department of Education (E2018313).

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Authors and Affiliations

  1. Artificial Intelligence School, Wuchang University of Technology, Wuhan, 430023, China

    Qiang Li, Shan Li, Fengxu Li & Zhaoyun He

  2. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Dengfeng Xu

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  1. Qiang Li
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  2. Shan Li
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  3. Fengxu Li
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  4. Dengfeng Xu
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Correspondence to Dengfeng Xu.

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Li, Q., Li, S., Li, F. et al. Analysis and Experiment of Vibration Isolation Performance of a Magnetic Levitation Vibration Isolator with Rectangular Permanent Magnets. J. Vib. Eng. Technol. 8, 751–760 (2020). https://doi.org/10.1007/s42417-019-00188-z

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  • DOI: https://doi.org/10.1007/s42417-019-00188-z

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