基于行驶稳定性的山区公路弯道最小半径优化

做好山区公路弯道最小半径指标设计是提升山区公路安全性的重要举措.通过对车辆弯道行驶动力学分析，以事故临界状态为限制建立安全模型，讨论了在不同设计车速下，弯道圆曲线最小半径与超高、横向附着系数等参数的关系，通过Carsim仿真软件验证了安全模型的正确性.理论分析及仿真结果表明，弯道设计应重点考虑避免车辆发生横向侧滑失稳，弯道最小半径与超高、横向附着系数值成反比，与车速呈正比，并与车型参数无关，进而提出山区公路弯道最小半径指标优化建议.在实际设计应用中，还应根据预测弯道最大运行车速值和横向附着系数值对最小半径指标进行校核.

Optimization of the Minimum Radius Index of Mountain Road Curve Based on Driving Stability

Optimizing the value of minimum radius index is an important measure to improve the security of mountain road. Based on the analysis of the driving dynamics of vehicle running in curve, a security model under the restrictive condition of accident is established in this paper. It is also theoretically discussed that the relationship among minimum radius of curve, superelevation, and lateral adhesion coefficient at different speeds. The correctness of the security model is proved by Carsim simulation software. The results show that: the curve design should focus on avoiding lateral slipping of the vehicle; the minimum radius of the curve is inversely proportional to the value of the ultra-high and lateral adhesion coefficient, and proportional to the speed, but the minimum radius of the curve is independent of the vehicle parameters. Furthermore, the optimization proposal for the minimum radius index of mountain road curve is also proposed. In the actual design and application, the minimum radius index of the curve should be checked according to the predicted maximum running speed value and the lateral adhesion coefficient value of the curve.