In this paper, the sideslip mechanism of a semi-trailer combination vehicle operating on curved downslope expressway segments was investigated. By collecting the data on roadway design and the vehicle, several typical scenarios were developed by TruckSim to simulate the influence of roadway geometrics, speeds, and loading levels on sideslip of the semi-trailer combination vehicle. Side friction factor was selected as the indicator to measure the risk of sideslip. The regression model of side friction factor was established by SPSS software. Based on the critical stable state of the vehicle, the operation safety of semi-trailer combination vehicle under different rainfall intensities were analyzed. The results showed that under different rainfall intensities, the semi-trailer combination vehicle can operate in a stable state at 80 km/h, but when the speed reaches 90 km/h, the sideslip occurs. Research results can provide the technical support for a more reasonable safety evaluation method for the semi-trailer combination vehicle on curved downslope expressway segments.
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机译：本文研究了在弯下坡高速公路路段上行驶的半挂车组合车辆的侧滑机理。通过收集有关巷道设计和车辆的数据，TruckSim开发了几种典型方案，以模拟巷道几何形状，速度和载荷水平对半挂车组合车的侧滑的影响。选择侧面摩擦系数作为衡量侧滑风险的指标。利用SPSS软件建立了侧向摩擦系数的回归模型。基于车辆的临界稳定状态，分析了半挂车在不同降雨强度下的运行安全性。结果表明，在不同的降雨强度下，半挂车在80 km / h时都可以稳定运行，但是当速度达到90 km / h时，就会发生侧滑。研究结果可为弯下坡高速公路半挂车组合车辆的更合理的安全性评价方法提供技术支持。
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