长大纵坡路段重型车辆爬坡速度  

Heavy truck climbing speed on long and steep longitudinal slope section

作　　者：董忠红[1] 倪凤英[1] 柳帅蒙 刘学 

机构地区：[1]长安大学道路施工与装备教育部重点实验室,陕西西安710064 [2]江苏华通动力重工有限公司,江苏镇江212003

出　　处：《长安大学学报（自然科学版）》2014年第3期23-27,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51008030);中央高校基本科研业务费专项资金项目(CHD2011JC100;CHD2011ZD001)

摘　　要：为了确定合理的坡度和坡长,建立了适宜于长大纵坡路段特点的重型车辆动力学模型。模型中的轮胎和悬架既能够承受垂向荷载作用,也可以承受沿坡道方向的水平荷载作用;利用发动机的转矩特性和动力传递系统的挡位转换关系,研究了重型车辆爬坡过程中的速度变化规律,分析了轴载、入坡速度、坡度和坡长等因素对车辆爬坡速度的影响。研究结果表明:爬坡过程中,车辆驱动力矩变化复杂,而车辆速度呈单调下降状态;当坡长足够长时,总存在某一稳定速度,坡度越大、轴重越高,车速下降越快,稳定速度就越小;入坡速度对稳定速度没有影响,但入坡速度越高,稳定坡长越大。在分析爬坡速度影响规律基础上,提出了坡度和坡长设计控制指标,建立了合理坡度与坡长的函数模型,可供山区公路路线设计参考。To determine the reasonable grade and grade length,a dynamic heavy truck model was set up,which could be suitable to the characteristics of steep and long longitudinal slope.The tire and suspension could bear forces not only in the vertical direction but also in the horizontal direction along slope.With consideration of the torque characteristics of the engine and the stall conversion relationship of the power transmission system,the speed variation during the heavy truck climbing process was studied.The influences of axle load,entrance speed,grade and grade length on the truck speed were analyzed.The results show that the change of the heavy truck drive torque is quite complex during the climbing process,but the speed is always in decline.If the grade length is long enough,there is always a steady speed.With the increase of grade and axle load,the decline of the speed will be faster,and the steady speed will be lower.The entrance speed has no influence on the steady speed,but with the increase of the entrance speed,the steady length will be longer.Based on the above analysis,the control indicatorsof grade and grade length are put forward,and then a function model on the relationship between grade and grade length is built up.The results can provide reference for route design of highway in mountain area.

关 键 词：道路工程 长大纵坡 重型车辆 坡度 坡长 车速 

分 类 号：U412[交通运输工程—道路与铁道工程]