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<p>Traditional linear vibration isolation technologies exhibit an inherent trade-off between low-frequency isolation performance and load-bearing capacity. Existing quasi-zero stiffness (QZS) structures rarely consider tensile working conditions, limiting their applicability to suspended vibration isolation of micro-devices. Moreover, many reported designs involve complex fabrication processes or insufficient parameter tunability. Inspired by the nonlinear stiffness characteristics of compound bows, this study proposes a tensile monolithic QZS metastructure composed of cosine beams and semicircular arches. Thermoplastic polyurethane (TPU) specimens were fabricated using fused deposition modeling (FDM), and their performance was evaluated through quasi-static tensile experiments and finite element analysis. Series, parallel, and gradient unit cell configurations were designed, with the gradient configuration showing better overall performance in load capacity and QZS range. The results demonstrate that the metastructure maintains stable QZS behavior within a displacement range of 4.0–8.0 mm. Effective vibration isolation is achieved when the frequency ratio Ω &gt; 0.24, with displacement transmissibility reduced by 84% compared to equivalent linear isolators. The proposed metastructure avoids buckling risk while offering simple fabrication and flexible parameter control, thereby providing a practical solution for low-frequency suspended vibration isolation.</p>

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Compound Bow-Inspired Novel Design of a Quasi-zero Stiffness Metastructure for Low-Frequency Suspended Vibration Isolation

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Yongtao Lyu,
  • Xuzhe Qiu,
  • Yunfei Lan,
  • Yingying Sun,
  • Zhi Sun,
  • Hanxing Zhu,
  • Mohammed Rafiq Abdul Kadir,
  • Yang Xia

摘要

Traditional linear vibration isolation technologies exhibit an inherent trade-off between low-frequency isolation performance and load-bearing capacity. Existing quasi-zero stiffness (QZS) structures rarely consider tensile working conditions, limiting their applicability to suspended vibration isolation of micro-devices. Moreover, many reported designs involve complex fabrication processes or insufficient parameter tunability. Inspired by the nonlinear stiffness characteristics of compound bows, this study proposes a tensile monolithic QZS metastructure composed of cosine beams and semicircular arches. Thermoplastic polyurethane (TPU) specimens were fabricated using fused deposition modeling (FDM), and their performance was evaluated through quasi-static tensile experiments and finite element analysis. Series, parallel, and gradient unit cell configurations were designed, with the gradient configuration showing better overall performance in load capacity and QZS range. The results demonstrate that the metastructure maintains stable QZS behavior within a displacement range of 4.0–8.0 mm. Effective vibration isolation is achieved when the frequency ratio Ω > 0.24, with displacement transmissibility reduced by 84% compared to equivalent linear isolators. The proposed metastructure avoids buckling risk while offering simple fabrication and flexible parameter control, thereby providing a practical solution for low-frequency suspended vibration isolation.