Random characteristics for vertical dynamic reaction force of steel spring isolator in a floating slab

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (16) : 204-212.

ZHU Zhihui1,2,HUANG Yujia1,HUANG Chengzhi1,DING Deyun3

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Abstract

In order to study the random characteristics of the vertical dynamic reaction force(DRF) of the steel spring isolator on the floating slab track(FST) of a subway, a vertical random vibration model of the train-floating slab track (T-FST) coupling system was established by using the finite element method and the pseudo excitation method (PEM).Multi-rigid body dynamics was used to build the train model; the finite element method was used to establish the floating slab track finite element model; the equivalent Hertz linear wheel-rail contact relationship was used to establish the T-FST coupling system dynamic equation.The non-stationary random vibration problem was transformed into a deterministic time history problem by the PEM, and the calculation model of the random vibration of the T-FST coupled time-varying system was deduced.Based on this model, the random characteristics of the vertical DRF of the steel spring isolator were studied.The results show that the vertical DRF of the steel spring vibration isolator is controlled by the deterministic excitation caused by train axle load, and track irregularity-induced random excitation has little effect on it.Different track irregularities have no effect on the main frequency distribution of the vertical DRF power spectrum of steel spring isolators.The statistical parameters of the vertical DRF of the steel spring isolator increase with the vehicle speed.

Key words

floating slab / train-track coupled system / steel spring isolator / dynamic reaction force(DRF) / random vibration / pseudo excitation method (PEM)

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ZHU Zhihui,HUANG Yujia,HUANG Chengzhi,DING Deyun. Random characteristics for vertical dynamic reaction force of steel spring isolator in a floating slab[J]. Journal of Vibration and Shock, 2021, 40(16): 204-212

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