Influence of Plane Curve Irregularity on Vehicle Dynamics

Taking subway vehicles as an example, this paper compares the influence of track irregularity on the dynamic response of vehicles on a straight line, and studies the changes of vertical wheel-rail force, lateral wheel-rail force, derailment coefficient, wheel weight loss rate, and other dynamic responses of vehicles when the train is running on a plane curve. The research results show that, when the definite track irregularity exists on the curved line, the impact on the vehicle dynamic response is more significant than that on the straight line. Therefore, it is suggested that when analyzing the vehicle dynamics response, the analysis of the vehicle dynamics response under the curve model should be emphasized. As the radius of the curve or the operating speed increases, the safety of subway vehicles becomes worse. Therefore, when the subway is running, the speed through the curve must match the curve radius. The welding seam irregularities at different curve positions have different effects on the vehicle dynamic response. The influence on the straight and gentle points is the largest, the influence on the circular curve section is in the middle, and the influence on the gentle points is the smallest.