Driving safety analysis of semi-trailer train at circular curve section in mountain area

作者：Jiang, Kang; Zhang, Meng Ya; Chen, Yi Kai

来源：Journal of Traffic and Transportation Engineering, 2015, 15(3): 109-117.

• Adhesion coefficient
• Curve section
• Driving safety
• Dynamics simulation
• Mountain road
• Stress and deformation
• Suspension dynamics
• Traffic planning

According to the characteristics of circular curve section for mountain area, the stress and deformation conditions of tire were analyzed, and the dynamics coupling model of semi-trailer train and the circular curve section in mountain area was established. The tire slip angles and articulation angle of tractor and semi-trailer were taken as indexes, the influences of the radius, superelevation and sliding adhesion coefficient of circular curve section on the driving safety of semi-trailer train under various speeds were analyzed by using the proposed dynamics simulation method, and the calculation results among running speed method, theoretic limit speed method and dynamics simulation method were compared. Simulation result shows that when the circular curve radius is 125 m, the superelevation is 2%, the sliding adhesion coefficients are 0.20, 0.35, 0.50 and 0.80 respectively, the critical safe speeds are 20, 35, 55, 72 km·h-1by using dynamics simulation method, all the critical safe speeds are 50 km·h-1by using running speed method, and the critical safe speeds are 20, 35, 55, 72 km·h-1by using theoretic limit speed method respectively. When the circular curve radius is 250 m, the sliding adhesion coefficient is 0.35, the superelevation are 0, 2%, 4% and 6% respectively, the critical safe speeds are 35, 38, 25, 20 km·h-1by using dynamics simulation method respectively, all the critical safe speeds are 60 km·h-1by using running speed method, and the critical safe speeds are 30, 31, 32, 33 km·h-1by using theoretic limit speed method respectively. When the superelevation is 6%, the sliding adhesion coefficient is 0.50, the circular curve radii are 125, 250, 400, 650 m respectively, the critical safe speeds are 58, 62, 70, 72 km·h-1by using dynamics simulation method respectively, the critical safe speeds are 50, 60, 68, 71 km·h-1by using running speed method respectively, and the critical safe speeds are 28, 37, 48, 60 km·h-1by using theoretic limit speed method respectively. In the proposed dynamics simulation method, the vehicle suspension dynamics characteristic, weather and road conditions are considered, and the running state of semi-trailer train can be described accurately.

• 出版日期2015
• 单位合肥工业大学