Wheel profile optimization of CRH3 type of EMU based on wheel wear and passenger comfort

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (18) : 148-155.

QI Yayun1,DAI Huanyun2,GAN Feng2,WEI Lai2,SANG Hutang2

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Abstract

With the continuous increase of the operation mileage of high-speed trains, the wheel wear of the high speed train has been becoming increasingly prominent, and the passenger comfort also has been decreasing.The problems caused by the wheel wear have seriously affected the economics of high-speed railway operation.The core of these problems lies in how to modify the wheel-rail contact relationship.Based on the original wheel profile, a rotary-scaling fine-tuning method for wheel profile design was proposed.The wheel wear and comfort index were set as the optimization goals, the Kriging surrogate model（KSM） and particle swarm optimization（PSO） algorithm were used to optimize the wheel profile.The wheel-rail contact characteristics, dynamic characteristics and wheel wear of the optimized profile were simulated and analysed.The results show that the wheel-rail contact points of the optimized tread are more evenly distributed, and the maximum wheel-rail contact stress is reduced; its critical speed is further improved, increasing by 35 km/h; under straight and curved track working conditions, the ride index is reduced; the wheel-rail wear performance of the profile is further improved, and the maximum wear depth is reduced by 13.4%.

Key words

high-speed electric multiple units / wheel wear / rotary-scaling fine-tuning (RSFT) method / Kriging surrogate model-particle swarm optimization（KSM-PSO） algorithm / wheel profile optimization

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QI Yayun,DAI Huanyun,GAN Feng,WEI Lai,SANG Hutang. Wheel profile optimization of CRH3 type of EMU based on wheel wear and passenger comfort[J]. Journal of Vibration and Shock, 2021, 40(18): 148-155

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