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<p>Inspired by the loofah sponge’s axially continuous porous core and peripheral hexagonal scaffold, we propose a compact bio-inspired low-frequency vibration isolator. An analytical static model reveals a Quasi-Zero-Stiffness (QZS) region produced by parallel coupling of an axial positive-stiffness spring and a nonlinear hexagonal link–spring unit. A Lagrangian dynamic model and ADAMS multibody simulations predict resonance and transmissibility and are validated by sinusoidal base-displacement tests. With a 5.775&#xa0;kg payload, the prototype achieves effective isolation above ~ 5&#xa0;Hz and ~ 25–30 dB attenuation at 20–22&#xa0;Hz while retaining comparable load capacity to linear references of similar size. Compared with linear isolators, the designed bio-inspired low-frequency vibration isolator exhibits a lower isolation onset and a broader useful bandwidth under a compact footprint, offering tunable low-frequency isolation via geometric and stiffness parameters (α, <i>k</i><sub>1</sub>, <i>k</i><sub>3</sub>, <i>l</i>).</p>

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A Bio-inspired Low-frequency Vibration Isolator Based on Loofah Sponge Structure

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Weijun Tian,
  • Xu Li,
  • Xiaoli Wu,
  • Haoran Huang,
  • Linghua Kong

摘要

Inspired by the loofah sponge’s axially continuous porous core and peripheral hexagonal scaffold, we propose a compact bio-inspired low-frequency vibration isolator. An analytical static model reveals a Quasi-Zero-Stiffness (QZS) region produced by parallel coupling of an axial positive-stiffness spring and a nonlinear hexagonal link–spring unit. A Lagrangian dynamic model and ADAMS multibody simulations predict resonance and transmissibility and are validated by sinusoidal base-displacement tests. With a 5.775 kg payload, the prototype achieves effective isolation above ~ 5 Hz and ~ 25–30 dB attenuation at 20–22 Hz while retaining comparable load capacity to linear references of similar size. Compared with linear isolators, the designed bio-inspired low-frequency vibration isolator exhibits a lower isolation onset and a broader useful bandwidth under a compact footprint, offering tunable low-frequency isolation via geometric and stiffness parameters (α, k1, k3, l).