Study on Axle-Box Acceleration: Measurement and Simulation for the Depth of Rail Corrugation

This is the authors' abstract. We don't add key points for this paper.

In this work, the relationship between the vertical vibration acceleration of axle box (VVAAB) and the rail corrugation is numerically investigated, and the corrugation depth under different wavelengths is accurately estimated based on the simulation research. First, a 3-D wheel-rail model is established with the parameters of Chinese high-speed railway and typical service vehicles. Then, the distribution characteristics between rail corrugation and VVAAB with different corrugation depths in the wavelength range of40~~ ~180mm are. Then, the rail surface change rate is introduced, and the functional relationship between the3σvalue of the VVAAB and rail surface change rate is fit by rational function and the least square method. Finally, a method of estimating corrugation depth by using the large value of VVAAB is proposed based on the corrugation wavelength estimated by VVAAB and the running speed. The field measurements are carried out in speed raising experiment and regular inspection, results show that the method has good performance in estimating the corrugation depth, the correlation coefficient between the estimated depth and the measured depth is 0.95, and the root mean square (rms) error of them is approximately 0.016 mm; The misjudgment rate in the decision-making of rail grinding using the estimated depth is approximately 9.73%.