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Purpose <p>The quasi-zero-stiffness (QZS) isolator represents a promising approach to address low-frequency vibration isolation challenges. However, conventional QZS isolators often suffer from notable limitations, including complex structure and limited QZS range.</p> Methods <p>To overcome these drawbacks, this study proposes a novel double-magnet linkage (DML) QZS isolator that features an expanded QZS range and enhanced operational robustness under significant dynamic loads. The magnetic forces are computed using the equivalent magnetic charge method, followed by parametric static analysis to optimize structural configuration and achieve an extended QZS range. Dynamic performance evaluation employs the harmonic balance method in combination with numerical simulations to assess the system’s vibration isolation effectiveness across varying excitation conditions.</p> Results <p>A prototype is fabricated for experimental validation, with comparative assessments under both harmonic and random excitation demonstrating its enhanced performance.</p> Conclusion <p>These results validate the structural advantages of the proposed design in the field of ultra-low frequency vibration isolation.</p>

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Theoretical and Experimental Analysis on a Double-Magnet Linkage Isolator: With Wide QZS Range and Anti-Self-Locking Feature

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Beining Zhu,
  • Junjie Xu,
  • Xukun Su,
  • Yubin Yang,
  • Xiangxiang Wen,
  • Nan Qian,
  • Yonggang Leng

摘要

Purpose

The quasi-zero-stiffness (QZS) isolator represents a promising approach to address low-frequency vibration isolation challenges. However, conventional QZS isolators often suffer from notable limitations, including complex structure and limited QZS range.

Methods

To overcome these drawbacks, this study proposes a novel double-magnet linkage (DML) QZS isolator that features an expanded QZS range and enhanced operational robustness under significant dynamic loads. The magnetic forces are computed using the equivalent magnetic charge method, followed by parametric static analysis to optimize structural configuration and achieve an extended QZS range. Dynamic performance evaluation employs the harmonic balance method in combination with numerical simulations to assess the system’s vibration isolation effectiveness across varying excitation conditions.

Results

A prototype is fabricated for experimental validation, with comparative assessments under both harmonic and random excitation demonstrating its enhanced performance.

Conclusion

These results validate the structural advantages of the proposed design in the field of ultra-low frequency vibration isolation.