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摘要: 对高速公路合理限速值的确定方法进行了研究, 以多体动力学仿真软件ADAMS为平台, 建立了车辆模型、道路模型、车-路耦合模型、车辆行驶过程仿真试验模块和车辆安全状态识别模块, 并开发了高速公路车-路条件下安全速度仿真识别系统。运用该系统对车辆在弯道与下坡路段的行驶状况进行了虚拟仿真分析。试验结果表明: 车辆在弯道与下坡路段的安全行驶极限速度仿真结果与标准标定的运行速度的相对误差为1.05%~3.80%, 该仿真识别系统可行。Abstract: The determined method of rational value for limit speed on freeway was studied, correlative simulation models and modules were established based on multi-body dynamics simulation software ADAMS.The models and modules included vehicle model, road model, vehicle-road coupling model, simulation test module of vehicle operating progress and identification module of vehicle safety status.The simulation and identification system of safety operating speed on freeway were empoldered, and the simulation analysis of vehicle operating statuses on curves and at downhill sections was done by using the system.Test result shows that the errors between the simulation values and standardization values of safety limit speed are in the range of 1.05% to 3.80%, so the simulation and identification system is feasible.
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图 5 安全行驶速度仿真识别系统
Figure 5. Simulation and identification system of safety operating speed
表 1 平曲线数据
Table 1. Data of horizontal curve
缓和曲线长度/m 切线长度/m 曲线长度/m 桩号1 桩号2 桩号3 桩号4 弯道半径/m 85.00 189.11 371.02 71.05 70.96 70.76 70.67 1 500 70.00 245.66 457.39 67.95 67.88 67.56 67.49 400 70.00 245.15 478.16 66.86 66.79 66.45 66.38 700 70.00 240.06 448.58 65.69 65.62 65.32 65.25 400 70.00 270.24 495.62 64.99 64.99 64.57 64.50 300 70.00 215.17 426.45 63.93 63.86 63.50 63.50 1 000 
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表 2 竖曲线数据
Table 2. Data of vertical curve
起点里程 讫点里程 桩号5 桩号6 长度/m 纵坡/% 曲线半径/m 曲线类型 268.38 269.78 66.72 68.12 1 400 0.30 40 000 凹型 268.78 270.55 65.95 66.72 770 -0.40 15 000 凸型 270.55 271.02 65.48 66.95 470 -1.94 44 000 凸型 271.02 271.38 65.12 65.48 360 -1.10 35 000 凹型 271.38 271.68 64.82 65.12 300 -0.60 8 000 凸型 271.68 272.69 64.21 64.82 610 -3.83 9 000 凸型 272.29 272.82 63.68 64.21 530 0.60 15 000 凹型
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表 3 仿真车度
Table 3. Simulation speeds
路段 仿真车度/(km·h-1) S型弯道 120 115 110 100 95 94 下坡 95 90 89 88 87 86
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