Numerical study of the stopping distance for runaway vehicle on truck escape ramp by using the improved equation of car driving

2018 6th International Conference on Mechanical Engineering, Materials Science and Civil Engineering

材料科学;机械制造;土木建筑工程

Qin, Pinpin^1 ; Wang, Jie^1 ; Qin, Guangyi^1 ; Cheng, Ming^1 ; Meng, Qiang^2

College of Mechanical Engineering, Guangxi University, Nanning, China^1

Automotive College of Jilin University, Jilin, China^2

关键词: Air resistance;    Full scale tests;    Length designs;    Mountain highway;    Simulation model;    Simulink;    Simulink modeling;    Stopping distance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/542/1/012021/pdf
DOI  :  10.1088/1757-899X/542/1/012021

来源: IOP

【 摘 要 】

The stopping distance of the runaway vehicle on the mountain road directly affects the length design of the arrester bed. Since the subsidence depth of runaway vehicle wheel on the arrester bed is neglected in the past researches, the stopping distance estimated by the vehicle driving equation is not accurate. The purpose of this paper is to supplement the influence of subsidence depth on rolling resistance and the influence of mountain highway altitude on air resistance, and improve the estimation accuracy through improved vehicle driving equation. Firstly, the formula for fitting the subsidence depth is established, and the formula for calculating the pushing resistance and compaction resistance is added. Considering the influence of the altitude of the mountain road on the air resistance, the formula for calculating the corrected air resistance and the air lift is added too and the improved vehicle driving equation is generated. Secondly, a simulink model is established based on the improved vehicle driving equation and determine the attester bed entering position and the initial entering speed of the runaway vehicle. Finally, the simulation model is run and analysed. The results show that the error rate of the simulation results is less than 8.0% compared with the full-scale test data. Compared with original equation, the shortening rate of the stopping distance is up to 85.59%.