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<p>Conventional quasi-zero stiffness (QZS) vibration isolators can only effectively isolate a single load. Integrating QZS elements with different characteristics in series is an effective way to realize multi-load vibration isolation. However, due to the essential nonlinear coupling of different QZS elements, an arbitrary series sequence arrangement is probably challenging when realizing broadband vibration isolation. Therefore, this paper investigates the nonlinear dynamic response of different QZS elements in different series sequences and enhances the broadband vibration isolation performance by designing the series sequence of QZS elements. Firstly, a nonlinear dynamics model of the multi-DOF non-zero stiffness equilibrium position is developed to address the effects of geometric nonlinearity on the vibration isolation performance of multilayer QZS systems with mismatched masses. Then, QZS isolator is designed by integrating QZS elements with customized design based on genetic algorithm. The results show that series sequence notably impacts vibration isolation performance under multiple loads. And the design of the series sequence can achieve a wider bandwidth. Finally, the customized design and multi-load analysis are validated by experiments. So, the study provides a practical way to handle trade-offs in isolating different loads.</p>

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Effects of series sequence on the nonlinear dynamic responses of integrated quasi-zero stiffness isolators

  • 期刊论文

  • 发表日期：

    2025年1月21日

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  • Shuai Hou,
  • Jianzheng Wei,
  • Guangdong Sui,
  • Zhimin Xie

摘要

Conventional quasi-zero stiffness (QZS) vibration isolators can only effectively isolate a single load. Integrating QZS elements with different characteristics in series is an effective way to realize multi-load vibration isolation. However, due to the essential nonlinear coupling of different QZS elements, an arbitrary series sequence arrangement is probably challenging when realizing broadband vibration isolation. Therefore, this paper investigates the nonlinear dynamic response of different QZS elements in different series sequences and enhances the broadband vibration isolation performance by designing the series sequence of QZS elements. Firstly, a nonlinear dynamics model of the multi-DOF non-zero stiffness equilibrium position is developed to address the effects of geometric nonlinearity on the vibration isolation performance of multilayer QZS systems with mismatched masses. Then, QZS isolator is designed by integrating QZS elements with customized design based on genetic algorithm. The results show that series sequence notably impacts vibration isolation performance under multiple loads. And the design of the series sequence can achieve a wider bandwidth. Finally, the customized design and multi-load analysis are validated by experiments. So, the study provides a practical way to handle trade-offs in isolating different loads.