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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2000040


Vibration response analysis of floating slab track supported by nonlinear quasi-zero-stiffness vibration isolators


Author(s):  Ze-ming ZHAO, Kai WEI, Juan-juan REN, Gao-feng XU, Xiang-gang DU, Ping WANG

Affiliation(s):  MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China; more

Corresponding email(s):   weimike@home.swjtu.edu.cn, renjuanjuan1983@hotmail.com

Key Words:  Floating slab track, Quasi-zero-stiffness vibration isolators, Vehicle-track coupled dynamics, Low-frequency vibration reduction


Ze-ming ZHAO, Kai WEI, Juan-juan REN, Gao-feng XU, Xiang-gang DU, Ping WANG. Vibration response analysis of floating slab track supported by nonlinear quasi-zero-stiffness vibration isolators[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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journal="Journal of Zhejiang University Science A",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2000040"
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%T Vibration response analysis of floating slab track supported by nonlinear quasi-zero-stiffness vibration isolators
%A Ze-ming ZHAO
%A Kai WEI
%A Juan-juan REN
%A Gao-feng XU
%A Xiang-gang DU
%A Ping WANG
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
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T1 - Vibration response analysis of floating slab track supported by nonlinear quasi-zero-stiffness vibration isolators
A1 - Ze-ming ZHAO
A1 - Kai WEI
A1 - Juan-juan REN
A1 - Gao-feng XU
A1 - Xiang-gang DU
A1 - Ping WANG
J0 - Journal of Zhejiang University Science A
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IS - -1
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%@ 1673-565X
Y1 - 1998
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2000040


Abstract: 
To improve the low-frequency vibration-reduction effect of a steel-spring floating slab track (FST), the authors proposed nonlinear quasi-zero-stiffness (QZS) vibration isolators composed of positive stiffness elements (PSEs) and negative stiffness elements (NSEs) were used to support the FST. First, considering the mechanical characteristics of the nonlinear QZS vibration isolators and the dynamic displacement limit (3 mm) of the FST, the feasible parameter groups were studied with the nonlinear stiffness variation range and bearing capacity as evaluation indices. A vertical vehicle-quasi-zero-stiffness floating slab track (QZS-FST) coupled dynamic model was then established. To obtain a reasonable nonlinear stiffness within a few millimeters, the original length of the NSEs must be analyzed first, because it chiefly determines the stiffness nonlinearity level. The compression length of the NSEs at the equilibrium position must be determined to obtain the low stiffness of the floating slab without vehicle load. Meanwhile, to meet the dynamic displacement limit of the FST, the PSE stiffness must be increased to obtain a higher stiffness at the critical dynamic displacement. Various stiffness groups for the PSEs and NSEs can provide the same dynamic bearing capacity and yet have a significantly different vibration-reduction effect. Excessive stiffness nonlinearity levels cannot effectively improve the vibration-reduction effect at the natural frequency. Furthermore, they also significantly amplify the vibrations above the natural frequency. In this paper, the vertical vibration acceleration levels (VALs) of the floating slab and the supporting force of the FST can be decreased by 6.9 dB and 55%, respectively, at the resonance frequency.

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