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<p>A novel six-degree-of-freedom (6-DOF) passive vibration isolation platform is studied, which consists of six nonlinear bionic multi-joint isolation structures, top and base platforms. It achieves excellent and adjustable vibration isolation performance in all six directions. By using the multi-rigid system analysis method, the static equilibrium equation and dynamic equation of the 6-DOF isolation platform are established. Vibration isolation performance in six directions (three translational and three rotational) is analyzed, with transmissibility as the indicator. The results show that: (a) By appropriately adjusting structural parameters based on their impact on the platform’s nonlinear stiffness characteristics, the vibration isolation performance in one direction can be optimized (with the minimum isolation frequency reaching as low as 1.1 Hz) without compromising the platform’s loading capacity; (b) By symmetrically arranging the multi-joint structures between layers, the novel vibration isolation platform can demonstrate superior high static and low dynamic stiffness (HSLDS) property and thus excellent vibration isolation performance; (c) The designed isolation platform exhibits low dynamic stiffness even when positioned far from the vibration equilibrium point, enabling low-frequency isolation performance under large displacement vibrations; (d) The platform exhibits directional differences in vibration isolation performance, with better isolation observed in the <i>P</i><sub><i>x</i></sub> and <i>P</i><sub><i>y</i></sub> directions compared to <i>P</i><sub><i>z</i></sub>, and in the <i>P</i><sub><i>α</i></sub> and <i>P</i><sub><i>β</i></sub> directions compared to <i>P</i><sub><i>γ</i></sub>.</p>

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Design and vibration reduction performance analysis of a 6-DOF nonlinear vibration isolation platform by employing bio-inspired multi-joint X-structure

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Guoqing Jiang,
  • Haoxiang Zang,
  • Yuanhao Xiong,
  • Yongjun Shen,
  • Zhenkun Guo,
  • Yang Yang,
  • Meng Li

摘要

A novel six-degree-of-freedom (6-DOF) passive vibration isolation platform is studied, which consists of six nonlinear bionic multi-joint isolation structures, top and base platforms. It achieves excellent and adjustable vibration isolation performance in all six directions. By using the multi-rigid system analysis method, the static equilibrium equation and dynamic equation of the 6-DOF isolation platform are established. Vibration isolation performance in six directions (three translational and three rotational) is analyzed, with transmissibility as the indicator. The results show that: (a) By appropriately adjusting structural parameters based on their impact on the platform’s nonlinear stiffness characteristics, the vibration isolation performance in one direction can be optimized (with the minimum isolation frequency reaching as low as 1.1 Hz) without compromising the platform’s loading capacity; (b) By symmetrically arranging the multi-joint structures between layers, the novel vibration isolation platform can demonstrate superior high static and low dynamic stiffness (HSLDS) property and thus excellent vibration isolation performance; (c) The designed isolation platform exhibits low dynamic stiffness even when positioned far from the vibration equilibrium point, enabling low-frequency isolation performance under large displacement vibrations; (d) The platform exhibits directional differences in vibration isolation performance, with better isolation observed in the Px and Py directions compared to Pz, and in the Pα and Pβ directions compared to Pγ.