Scholarlink

<p>Traditional quasi-zero stiffness (QZS) isolators exhibit excellent vibration isolation performance in the low-frequency range. To further enhance their shock resistance, this study investigates an active control strategy that is implemented passively via a mechanical mechanism. Firstly, based on the dynamic characteristics of the isolator, an active control strategy using negative cubic feedback of the relative displacement between the base and the isolated object is proposed. Conditions for maintaining the QZS property and constraints ensuring positive stiffness of the system are derived. Secondly, theoretical analysis reveals the stiffness characteristics of the actively controlled QZS isolator, demonstrating that the active control contributes to lower dynamic stiffness of the system. Thirdly, numerical simulations under two distinct shock excitations demonstrate 53.86% and 77.74% reductions in RMS (root mean square) acceleration values respectively, compared to the traditional QZS isolator. Fourthly, since the designed cubic feedback control relies solely on relative displacement, a passive implementation approach is proposed using a mechanism with a roller interacting against a cam featuring a specially contoured surface. This mechanism is designed to reproduce the force characteristics equivalent to those of the active control force. Moreover, an analytical solution for the cam profile curve is obtained. Finally, simulations of a virtual prototype model in ADAMS confirm that the passive implementation fully achieves the performance of the active control strategy.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Research on active control and passive realization for improving impact resistance performance of traditional quasi-zero stiffness isolators

  • 期刊论文

  • 发表日期：

    2026年4月8日

查看全文
  • Chunyu Wei,
  • Shuaijun Liu

摘要

Traditional quasi-zero stiffness (QZS) isolators exhibit excellent vibration isolation performance in the low-frequency range. To further enhance their shock resistance, this study investigates an active control strategy that is implemented passively via a mechanical mechanism. Firstly, based on the dynamic characteristics of the isolator, an active control strategy using negative cubic feedback of the relative displacement between the base and the isolated object is proposed. Conditions for maintaining the QZS property and constraints ensuring positive stiffness of the system are derived. Secondly, theoretical analysis reveals the stiffness characteristics of the actively controlled QZS isolator, demonstrating that the active control contributes to lower dynamic stiffness of the system. Thirdly, numerical simulations under two distinct shock excitations demonstrate 53.86% and 77.74% reductions in RMS (root mean square) acceleration values respectively, compared to the traditional QZS isolator. Fourthly, since the designed cubic feedback control relies solely on relative displacement, a passive implementation approach is proposed using a mechanism with a roller interacting against a cam featuring a specially contoured surface. This mechanism is designed to reproduce the force characteristics equivalent to those of the active control force. Moreover, an analytical solution for the cam profile curve is obtained. Finally, simulations of a virtual prototype model in ADAMS confirm that the passive implementation fully achieves the performance of the active control strategy.