Effects of steel spring damage on vibration performance of metro train-floating slab track system

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (11) : 228-234.

WEI Xinjiang1, SHI Wenchao2, JIANG Jiqing1, ZHANG Jiabin1, DING Zhi1

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Abstract

In order to study influences of steel spring damage on vibration of floating slab track and metro train, a 2-D metro train-floating slab track-lining-foundation coupled system model based on the structural dynamics theory was established considering steel spring damage. The dynamic responses of the train-track system were solved using the modal analysis method and Newmark-β method to study the effects of damaged steel spring number, damage level, damage location and train speed on the vibration performance of the train-track system. The results showed that steel spring damage can aggravate vibration responses of the train-track system, and vibration amplitudes increase significantly with increase in damaged steel spring number and damage level; distribution location of damaged steel springs significantly affects vibration performance of the train-track system, and if damaged steel spring number keeps the same, influence of all damaged steel springs being located at ends of one floating slab on vibration amplitudes of the train-track system is the maximum; if floating slabs have damaged steel springs, amplitudes of vertical accelerations of the train-track system increase obviously with increase in train speed, but vertical wheel-track contact force and track vertical displacement amplitudes basically are not affected; steel spring damage has adverse effects on passenger comfort, track service life, and surrounding environment vibration; vertical accelerations of train body and lining can be taken as sensitive indexes to detect and replace damaged steel springs, and avoid causing more serious consequences.

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metro train / floating slab track / damaged steel spring / vibration / train speed

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WEI Xinjiang1, SHI Wenchao2, JIANG Jiqing1, ZHANG Jiabin1, DING Zhi1. Effects of steel spring damage on vibration performance of metro train-floating slab track system[J]. Journal of Vibration and Shock, 2019, 38(11): 228-234

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