Vibration reduction characteristics of the floating slab track system with a chiral superstructure vibration isolator

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 248-255.

HE Ligong1,ZHAO Caiyou2,LIU Wenwu1,KONG Xiaoyu2,LUO Xinwei1

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Abstract

To address the environmental vibration problem caused by subway trains, this paper proposes a chiral superstructure vibration isolator structure with tensile-torsional characteristics based on the local resonance mechanism, and establishes a finite element model of vibration transmission characteristics and a mathematical model of vehicle-track-substrate coupling dynamics, and investigates the vibration reduction performance of the chiral superstructure vibration isolator floating slab track system from the perspective of frequency response characteristics and dynamic response. The vibration damping performance of the floating slab track system using the chiral superstructure vibration isolator is investigated from the perspective of frequency response characteristics and dynamic response, and then the reduction of the vertical displacement of the floating slab is studied. The results show that: the equivalent vertical stiffness of the chiral superstructure vibration isolator is mainly controlled by the support rod; the onset frequency of the decay domain is influenced by the soft material cladding; the chiral superstructure vibration isolator floating slab track retains the original damping effect of the steel spring floating slab track while increasing the attenuation effect of vibration transmission in specific frequency bands, but a resonance peak is generated outside the decay domain, and the effect of the resonance peak can be reduced by setting damping in the structure; the chiral superstructure vibration isolator floating slab track system has a resonance peak. The effect of the resonance peak can be reduced by setting damping in the structure; the chiral superstructure vibration isolator floating slab track system can effectively control the vertical displacement of the floating slab caused by the subway train load excitation, compared with the steel spring floating slab more, its effect on the displacement reduction can reach 11.5%.

Key words

chiral superstructure isolator / environmental vibration / local resonance / floating slab track / vibration damping

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HE Ligong1,ZHAO Caiyou2,LIU Wenwu1,KONG Xiaoyu2,LUO Xinwei1. Vibration reduction characteristics of the floating slab track system with a chiral superstructure vibration isolator[J]. Journal of Vibration and Shock, 2023, 42(22): 248-255

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