Applied Mathematics and Mechanics (English Edition) ›› 2024, Vol. 45 ›› Issue (8): 1279-1294.doi: https://doi.org/10.1007/s10483-024-3137-8

• Articles •     Next Articles

A vibration isolator with a controllable quasi-zero stiffness region based on nonlinear force design

Xinyu LIAN1, Bing LIU1, Huaxia DENG1,2,*(), Xinglong GONG1,3   

  1. 1 CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China
    2 State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
    3 State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
  • Received:2023-12-26 Online:2024-08-03 Published:2024-07-31
  • Contact: Huaxia DENG E-mail:hxdeng@ustc.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(12372187);the National Natural Science Foundation of China(52321003);the National Natural Science Foundation of China(12302250);the Fundamental Research Funds for the Central Universities(KY2090000094);the Fundamental Research Funds for the Central Universities(WK2480000010);the Fellowship of China Postdoctoral Science Foundation(2024M753103);the Fellowship of China Postdoctoral Science Foundation(2023M733388);the University Synergy Innovation Program of Anhui Province(GXXT-2023-024);the CAS Talent Introduction Program(KJ2090007006);Project supported by the National Natural Science Foundation of China (Nos. 12372187, 52321003, and 12302250), the Fundamental Research Funds for the Central Universities (Nos. KY2090000094 and WK2480000010), the Fellowship of China Postdoctoral Science Foundation (Nos. 2024M753103 and 2023M733388), the University Synergy Innovation Program of Anhui Province (No. GXXT-2023-024), and the CAS Talent Introduction Program (No. KJ2090007006)

Abstract:

To achieve stability optimization in low-frequency vibration control for precision instruments, this paper presents a quasi-zero stiffness (QZS) vibration isolator with adjustable nonlinear stiffness. Additionally, the stress-magnetism coupling model is established through meticulous theoretical derivation. The controllable QZS interval is constructed via parameter design and magnetic control, effectively segregating the high static stiffness bearing section from the QZS vibration isolation section. Furthermore, a displacement control scheme utilizing a magnetic force is proposed to regulate entry into the QZS working range for the vibration isolation platform. Experimental results demonstrate that the operation within this QZS region reduces the peak-to-peak acceleration signal by approximately 66.7% compared with the operation outside this region, thereby significantly improving the low frequency performance of the QZS vibration isolator.

Key words: low frequency, nonlinear, vibration isolator, quasi-zero stiffness (QZS)

2010 MSC Number: 

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