Vertical dynamic characteristics of steel spring floating-slab track and its effects on wheel-rail contact forces

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (16) : 67-76.

ZHOU Shenglu，LI Wei，ZHOU Zhijun，WEN Zefeng，ZHONG Wensheng

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Abstract

Steel spring floating slab (SSFS) is extensively utilized as a high vibration damping track in metro lines. The wheel-rail dynamic behavior has a major impact on the rail corrugation occurred on the some SSFS track. A three-dimensional finite element (FE) model of wheel–rail transient rolling contact on the SSFS track was established to investigate the vertical dynamic characteristics of the track and their effects on the wheel-rail transient contact forces. The vertical receptance of the track was analyzed with and without vehicle loading. The wheel-rail vertical transient contact force under wide-frequency excitation of the rail irregularity was simulated in the FE model. The simulation results show that (1) Without vehicle loading, the vibration modes of the SSFS track below 100 Hz (including 22 Hz, 43 Hz, 68 Hz, etc.) are the vertical bending of the rail and the floating slab together. The vibration modes of the track in the frequency range from 100 to 1400 Hz represent the bending of the rail relative to the floating slab. (2) After vehicle loading, the P2 resonance occurs at 59 Hz. The vertical receptance of the track shows the peaks at 64 Hz and 72 Hz, which represent the bending of the entire track. (3) New peaks of the rail receptance occur at frequencies 364, 489, and 623 Hz after considering flexible wheel-rail coupling. The peaks at 364 and 489 Hz represent the joint vibration of wheelset and track slab and the peak at 623 Hz represents the rail bending due to the interference of dual wheelsets in the track. (4) When the vehicle passes through rail irregularities with a wavelength of 60 ~ 220 mm, the vertical transient contact force attributed to the bending mode of the entire track reaches its maximum at about 70 Hz, which is the reason for the corrugation with a wavelength of 160 ~ 200 mm on the SSFS track.

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metro / steel spring floating slab / transient wheel-rail rolling contact / receptance / finite element method

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ZHOU Shenglu，LI Wei，ZHOU Zhijun，WEN Zefeng，ZHONG Wensheng. Vertical dynamic characteristics of steel spring floating-slab track and its effects on wheel-rail contact forces[J]. Journal of Vibration and Shock, 2024, 43(16): 67-76

References

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