Dynamic Load Characteristics and Road Friendliness of Virtual Track Train in Full Running Conditions

Abstract:

A dynamics model of the virtual track train was developed based on the theories of vehicle， tire and nonlinear dynamics. The coupling between vehicles and the tire-road interaction were also considered in the virtual track train dynamics model. Meanwhile， the correctness of the dynamics model was verified by field tests. The dynamic load characteristics and road friendliness of the virtual track train in full running conditions between stations were investigated through theoretical analysis and numerical calculations. In addition， the effects of running speed， road grade and acceleration/deceleration were also analyzed. The results indicate that the longitudinal force of each tire in the full running condition is constant. The longitudinal force is equal in magnitude and opposite in direction in the traction and braking conditions， and is zero in the uniform condition. In the traction condition， the root means square （RMS） of the vertical dynamic load on the front axle of Vehicle 1 is the largest， while in the braking condition， the rear axle of Vehicle 3 is the largest. The road friendliness is better in the uniform condition compared with that in the traction condition and braking condition. The RMS of vertical dynamic load and road friendliness are all positively correlated with running speed， acceleration/deceleration， and negatively correlated with road grade. This paper can provide recommendations for the operation mode of the virtual track train to improve operation efficiency， and can provide guidance for the selection of asphalt pavement to reduce road damage.

Key words:virtual track train;full running conditions;dynamic load characteristics;road friendliness