Theoretical Analysis and Experimental Identification of a Vibration Isolator with Widely- Variable Stiffness

Zhan Hu, Xing Wang, Hongxiang Yao, Guangyuan Wang, Gangtie Zheng*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)


This paper develops an adjustable high-static-low-dynamic (AHSLD) vibration isolator with a widely variable stiffness. By adjusting deformations of its horizontal springs, the natural frequency of the isolator can be substantially changed starting from a quasi-zero value. In this paper, the nonlinear static and dynamic analyses of the AHSLD isolator are presented. Effects of horizontal adjustments on the variation range of the stiffness and nonlinear dynamic characteristics are investigated. Good performance of the stiffness variation is validated by free-vibration tests. The wide-range variable stiffness from 0.33 N/mm to 23.2 N/mm is achieved in tests, which changes the natural frequency of the isolator from an ultra-low value of 0.72 Hz to 5.99 Hz. Besides, its nonlinear dynamic characteristics are also experimentally identified by applying the Hilbert transform. Both analytical and experimental results demonstrate the weakly hardening nonlinearity in the tested AHSLD isolator, which will not degrade its performance in practical applications.

Original languageEnglish
Article number051014
Number of pages11
JournalJournal of Vibration and Acoustics
Issue number5
Early online date26 Apr 2018
Publication statusPublished - 1 Oct 2018


  • high-static-low-dynamic stiffness
  • Hilbert transform
  • nonlinear vibration
  • variable stiffness


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