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.
Theoretical Analysis and Experimental Identification of a Vibration Isolator With Widely-Variable Stiffness
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received November 28, 2017; final manuscript received February 21, 2018; published online April 26, 2018. Assoc. Editor: Izhak Bucher.
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Hu, Z., Wang, X., Yao, H., Wang, G., and Zheng, G. (April 26, 2018). "Theoretical Analysis and Experimental Identification of a Vibration Isolator With Widely-Variable Stiffness." ASME. J. Vib. Acoust. October 2018; 140(5): 051014. https://doi.org/10.1115/1.4039537
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