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山区圆曲线路段半挂汽车列车行驶安全性分析

, PP. 109-117

Keywords: 交通规划,山区公路,圆曲线路段,半挂汽车列车,行驶安全性

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Abstract:

根据山区圆曲线路段的特点,分析了轮胎的受力和变形情况,建立了半挂汽车列车与山区圆曲线路段的耦合动力学模型。以牵引车和半挂车的轮胎侧偏角和折叠角为指标,运用提出的动力学仿真法分析了不同车速下圆曲线路段半径、超高、滑动附着系数对半挂汽车列车行驶安全性的影响,并与运行速度法和理论极限速度法的计算结果进行对比。仿真结果表明当圆曲线半径为125m,路面超高为2%,滑动附着系数分别为0.20、0.35、0.50、0.80时,运用动力学仿真法求得的临界安全车速分别为20、35、55、72km?h-1,运用运行速度法求得的临界安全车速均为50km?h-1,运用理论极限速度法求得的临界安全车速分别为18、20、25、30km?h-1;当圆曲线半径为250m,滑动附着系数为0.35,超高分别为0、2%、4%、6%时,运用动力学仿真法求得的临界安全车速分别为35、38、25、20km?h-1,运用运行速度法求得的临界安全车速均为60km?h-1,运用理论极限速度法求得的临界安全车速分别为30、31、32、33km?h-1;当路面超高为6%,滑动附着系数为0.50,圆曲线半径分别为125、250、400、650m时,运用动力学仿真法求得的临界安全车速分别为58、62、70、72km?h-1,运用运行速度法求得的临界安全车速分别为50、60、68、71km?h-1,运用理论极限速度法求得的临界安全车速分别为28、37、48、60km?h-1。可见,提出的动力学仿真法考虑了车辆悬架动力学特性、天气与路面条件,可以准确描述半挂汽车列车的运行状态。

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