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<p>This paper proposes a new approach for actively adjusting both positive and negative stiffnesses, allowing the torsional vibration isolator to adapt to load changes. The isolator comprises permanent magnets providing negative stiffness and spring plates providing positive stiffness. In this design, the adjustment of both positive and negative stiffness is achieved by a single mechanism. The paper establishes a torque calculation model for the torsional magnetic spring using the equivalent magnetic load method. Dynamic equations with load imperfections are established using the harmonic balance method to analyze the effects of load imperfections and excitation amplitude on the isolator’s dynamic characteristics. The simulation results reveal that, under typical operating conditions, the resonance peak and starting isolation frequency of the proposed vibration isolator are reduced by 22.7 % and 72.9 % respectively, compared to those of the non-adjustable QZS vibration isolator. This demonstrates that the proposed vibration isolator can actively adapt to load changes through stiffness adjustments, effectively broaden the isolator’s load range.</p>

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Quasi-zero stiffness torsional vibration isolator with synchronous adjustable positive and negative stiffnesses and mechanical characteristics study

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Tianzi Shao,
  • Chunsong Zhang,
  • Xueyong Li,
  • Yang Li

摘要

This paper proposes a new approach for actively adjusting both positive and negative stiffnesses, allowing the torsional vibration isolator to adapt to load changes. The isolator comprises permanent magnets providing negative stiffness and spring plates providing positive stiffness. In this design, the adjustment of both positive and negative stiffness is achieved by a single mechanism. The paper establishes a torque calculation model for the torsional magnetic spring using the equivalent magnetic load method. Dynamic equations with load imperfections are established using the harmonic balance method to analyze the effects of load imperfections and excitation amplitude on the isolator’s dynamic characteristics. The simulation results reveal that, under typical operating conditions, the resonance peak and starting isolation frequency of the proposed vibration isolator are reduced by 22.7 % and 72.9 % respectively, compared to those of the non-adjustable QZS vibration isolator. This demonstrates that the proposed vibration isolator can actively adapt to load changes through stiffness adjustments, effectively broaden the isolator’s load range.