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<p>To address the issue of device wear deterioration and reduced service life due to the internal force unbalance in non-bearing direction, for the traditional spring parallel quasi-zero-stiffness (QZS) isolators, this paper proposes a new type of seven-springs parallel quasi-zero-stiffness isolator (SSPQZSI) that incorporates a negative stiffness mechanism by coupling and paralleling the horizontal tension springs and diagonal compression springs. Based on the internal force analysis of the SSPQZSI, the system structural parameter relationships with QZS characteristics are determined under the conditions that the horizontal internal force of the designed SSPQZSI is equal to zero at the equilibrium position. Then, with the nonlinear implicit function relationship between the dimensionless system vertical restoring force and the dimensionless system response displacement considered, the polynomial fitting is used to determine their direct analytic relationship for the SSPQZSI. Furthermore, through the analysis of the amplitude-frequency response characteristics and the vibration displacement transmission characteristics, the dynamic performance of the SSPQZSI is revealed. The results show that the SSPQZSI, with internal force balance, has better isolation effect in low-frequency range compared with the equivalent linear system.</p>

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Research on a seven-springs parallel vibration isolator with quasi-zero-stiffness and internal force optimization

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Jinyong Ju,
  • Wenli Jin,
  • Yufei Liu

摘要

To address the issue of device wear deterioration and reduced service life due to the internal force unbalance in non-bearing direction, for the traditional spring parallel quasi-zero-stiffness (QZS) isolators, this paper proposes a new type of seven-springs parallel quasi-zero-stiffness isolator (SSPQZSI) that incorporates a negative stiffness mechanism by coupling and paralleling the horizontal tension springs and diagonal compression springs. Based on the internal force analysis of the SSPQZSI, the system structural parameter relationships with QZS characteristics are determined under the conditions that the horizontal internal force of the designed SSPQZSI is equal to zero at the equilibrium position. Then, with the nonlinear implicit function relationship between the dimensionless system vertical restoring force and the dimensionless system response displacement considered, the polynomial fitting is used to determine their direct analytic relationship for the SSPQZSI. Furthermore, through the analysis of the amplitude-frequency response characteristics and the vibration displacement transmission characteristics, the dynamic performance of the SSPQZSI is revealed. The results show that the SSPQZSI, with internal force balance, has better isolation effect in low-frequency range compared with the equivalent linear system.