大合成纵坡条件下车辆行驶稳定性分析

积雪冰冻区,地形条件差,路线落差大,路段纵坡度及曲线半径调整难度大,导致合成纵坡大于JTG D20-2017《公路路线设计规范》的要求.对于合成纵坡超过规范时,在特定的车型条件下,能否满足安全行车需要,需开展专项分析和安全论证.通过建立车辆受力分析模型,以小型客车为例,分析在不同路面附着系数条件下,车辆通过较大合成纵坡路段时的行驶稳定性,为山区公路设计安全性提供依据.

天棚阻尼控制的快速原型验证

为提高车辆平顺性及驾乘体验,基于天棚阻尼控制策略,利用MATLAB/Simulink搭建了一套垂向减振器半主动悬架控制模型,并在扭曲路工况进行车辆动力学仿真分析,实现了该策略在软件层面的有效性验证;将上述模型进行通道匹配,并移植烧录至硬件dSPACE MicroAutoBoxⅢ中进行实车特征路的验证工作。主、客观相关数据表明,天棚阻尼控制下的半主动悬架,能使车辆主驾驶位座椅加速度均方根值明显减小,车辆的前后轴冲击、振动收敛、车身姿态等均有明显改善,验证了天棚阻尼控制策略在工程中的有效性。

Mechanics analysis of vehicle bumping at approach slabs with superelevation

In order to analyze the pavement stress caused by vehicle bumping at an approach slab, a simplified four-wheeled bi- axle vehicle-moving model is proposed. The effect of damping and vibration reduction in the process of vehicle-moving is not considered. Based on the position change of vehicle wheels at the approach slab, the vehicle dynamic vibration equations are summarized. Meanwhile, the undetermined coefficients of the vibration equations are obtained using the boundary and initial conditions of the vehicle. The analytical motion solutions of rear and front wheels at different stages are concluded. Consequently, a four-wheeled vehicle model is developed and vibration equations are provided, which can be used to analyze the impact of complicated stress on pavement. The results show that the excessive stress and stress concentration will occur at the approach slab, and it needs to be strengthened.

重载矿用胶轮车液压制动系统设计研究

根据煤矿井下运输的安全要求,对一款轮边驱动重载矿用胶轮车进行制动指标的理论计算,并对制动系统进行了选型设计。在MATLAB/Simulink中建立整车动力学模型,根据井下实际环境,对胶轮车在多种运行工况下进行了仿真分析。仿真结果表明,所设计的轮边驱动重载矿用胶轮车的液压制动系统满足设计要求和煤矿安全规程。该研究对提高矿井辅助运输安全性、提升井下作业效率具有积极的意义。