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Purpose <p>This study aims to overcome the limitations of traditional passive vibration isolation under complex offshore conditions. An active vibration isolation scheme based on a differential magnetic levitation structure is proposed to improve broadband isolation capability and dynamic stability for precision equipment in marine environments.</p> Methods <p>A semi-analytical equivalent magnetic circuit model is developed to account for spatial leakage flux and fringing effects under large air-gap conditions. By calibrating leakage flux coefficients through experiments, the electromagnetic force characteristics in the low-current regime (0.3 A to 0.5 A) are accurately captured. A Skyhook-based proportional–derivative (PD) control strategy is then implemented using displacement and velocity feedback of the isolated mass, enabling tunable dynamic characteristics via virtual damping and stiffness. A genetic algorithm (GA) is further employed for multi-objective optimization of control parameters under practical constraints.</p> Results <p>The proposed method reduces the vibration isolation onset frequency to approximately 0.77 Hz while maintaining acceleration transmissibility below 0 dB in the low-frequency range. In the medium-to-high-frequency range, transmissibility remains between −15 dB and −20 dB under representative excitations, with a maximum time-domain vibration reduction of16.40 dB under a mixed broadband excitation.</p> Conclusion <p>The proposed strategy effectively overcomes the low-frequency limitations of conventional passive isolators and demonstrates strong potential for broadband vibration suppression of precision equipment under complex offshore operating conditions.</p>

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Broadband Vibration Isolation of a Dual-Sided Magnetic Levitation System via Decoupled Dynamics and Genetic Algorithm Optimization

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Nan Sun,
  • Changming Dai,
  • Bo Zhou,
  • Chaodong Hu,
  • Zhengyuan Liu,
  • Gaofei Su

摘要

Purpose

This study aims to overcome the limitations of traditional passive vibration isolation under complex offshore conditions. An active vibration isolation scheme based on a differential magnetic levitation structure is proposed to improve broadband isolation capability and dynamic stability for precision equipment in marine environments.

Methods

A semi-analytical equivalent magnetic circuit model is developed to account for spatial leakage flux and fringing effects under large air-gap conditions. By calibrating leakage flux coefficients through experiments, the electromagnetic force characteristics in the low-current regime (0.3 A to 0.5 A) are accurately captured. A Skyhook-based proportional–derivative (PD) control strategy is then implemented using displacement and velocity feedback of the isolated mass, enabling tunable dynamic characteristics via virtual damping and stiffness. A genetic algorithm (GA) is further employed for multi-objective optimization of control parameters under practical constraints.

Results

The proposed method reduces the vibration isolation onset frequency to approximately 0.77 Hz while maintaining acceleration transmissibility below 0 dB in the low-frequency range. In the medium-to-high-frequency range, transmissibility remains between −15 dB and −20 dB under representative excitations, with a maximum time-domain vibration reduction of16.40 dB under a mixed broadband excitation.

Conclusion

The proposed strategy effectively overcomes the low-frequency limitations of conventional passive isolators and demonstrates strong potential for broadband vibration suppression of precision equipment under complex offshore operating conditions.