Experimental Research on Wheel-rail Force of EMU under Different Line Conditions

doi:10.3901/JME.2023.10.323

Abstract

Abstract: The wheel-rail force is the most important index for considering the safety and stability of high-speed electric multiple units(EMU). With the continuous increase of speed, the dynamic performance and reliability of the running part of high-speed trains are increasing. It is becoming more and more important to carry out research on wheel-rail load characteristics, distribution rules and safety under high-speed conditions. In this paper, continuous force-measuring wheelset is used to measure the wheel-rail forces of a high-speed train under typical railway conditions and operating speeds. The analysis have obtained the wheel-rail forces characteristics under straight lines, curves, and various types of turnouts. Research has found that the frequency response range of wheel-rail force on ballasted tracks is partly larger than that on ballastless tracks. The wheel-rail force samples are generally distributed normally, and the dispersion degree of the vertical force distribution is positively correlated with the speed. Under the curve working condition, the mean value of the horizontal and vertical force distribution depends on the under-elevation of the curve. The maximum derailment coefficient and rate of wheel load reduction both appear when passing the turnout. The derailment coefficients of No. 18 and No. 42 turnouts are 0.49 and 0.37 respectively, and rate of wheel load of the two models are 0.20 and 0.23 respectively, which meet the safety requirements. The above conclusions provide references for wheel-rail dynamic test; it also gives suggestions for high-speed railway design.

Key words: electric multiple units(EMU), continuous force-measuring wheelset, working condition, wheel-rail force, distribution law

CLC Number:

U270

ZHANG Yizhe, ZHANG Zhichao, DU Ruitao, ZU Honglin, CHU Gaofeng. Experimental Research on Wheel-rail Force of EMU under Different Line Conditions[J]. Journal of Mechanical Engineering, 2023, 59(10): 323-332.

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