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

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