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<p>To further enhance the performance of integrated quasi-zero stiffness (IQZS) isolator, this work presents a novel IQZS isolator with segmented variable cross-section thickness (IQZS-SVCST) based on a non-uniform thickness distribution (NUTD) strategy. The proposed design features an inclined-wall with tunable local thickness and width, yielding two configurations: Type A, which is the variable end cross-section thickness isolator, and Type B, which is the variable central cross-section thickness isolator. Subsequently, analytical derivation of contact stiffness and restoring force was performed using energy methods, while the amplitude-frequency response and force transmissibility were derived through harmonic balance analysis. Based on the developed models, the influence of various factors on the system's vibration attenuation capability was investigated. Compared with conventional configurations and combined with optimization results from genetic algorithms, the proposed NUTD strategy demonstrates enhanced parameter adjustability and significant structural lightweight effects while maintaining excellent isolation performance. Experimental results verify the accuracy of the developed theoretical model and related calculations for IQZS-SVCST isolator, showing that the introduced NUTD parameters achieves 46.3% and 52.4% reductions in resonant frequency for the Type A and Type B isolators, respectively. The proposed design strategy provides a feasible solution for compact low-frequency vibration isolators.</p>

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Investigation on Dynamic Performance of a Thickness-Variable Quasi-Zero Stiffness Isolator

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Rongzheng Zou,
  • Haiping Liu,
  • Zhe Wang,
  • Shikun Zhou,
  • Yan Wang

摘要

To further enhance the performance of integrated quasi-zero stiffness (IQZS) isolator, this work presents a novel IQZS isolator with segmented variable cross-section thickness (IQZS-SVCST) based on a non-uniform thickness distribution (NUTD) strategy. The proposed design features an inclined-wall with tunable local thickness and width, yielding two configurations: Type A, which is the variable end cross-section thickness isolator, and Type B, which is the variable central cross-section thickness isolator. Subsequently, analytical derivation of contact stiffness and restoring force was performed using energy methods, while the amplitude-frequency response and force transmissibility were derived through harmonic balance analysis. Based on the developed models, the influence of various factors on the system's vibration attenuation capability was investigated. Compared with conventional configurations and combined with optimization results from genetic algorithms, the proposed NUTD strategy demonstrates enhanced parameter adjustability and significant structural lightweight effects while maintaining excellent isolation performance. Experimental results verify the accuracy of the developed theoretical model and related calculations for IQZS-SVCST isolator, showing that the introduced NUTD parameters achieves 46.3% and 52.4% reductions in resonant frequency for the Type A and Type B isolators, respectively. The proposed design strategy provides a feasible solution for compact low-frequency vibration isolators.