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为从力学角度解析轮胎印迹显隐特性,基于路面分形理论和粗糙路面接触机理,引入结合路面分形和橡胶特性的滑动摩擦因数改进模型,提出了考虑轮胎动摩擦特性的9自由度非稳态车辆模型,分析了车辆非稳态工况下,轮胎和路面对非稳态轮胎作用力差异特性的影响。建立了车载稳定性检测系统并进行实车试验,验证了车辆模型的有效性,应用MATLAB在固定转向角和恒定制动条件下对模型进行了仿真分析。研究结果表明:轮胎和路面性质对轮胎纵向作用力差异特性影响相对较小,对轮胎横向作用力和垂向载荷的差异特性影响显著;轮胎横向作用力和垂向载荷差异特性是产生轮胎印迹显隐特性的一个主要原因。
In order to analyze the characteristic of tire imprints from mechanics, based on the fractal theory of pavement and the contact mechanism of rough pavement, an improved sliding friction coefficient model based on the fractal and rubber properties of pavement was introduced. A 9-degree-of-freedom unsteady vehicle model considering the dynamic friction characteristics of tires The influence of tires and pavement on the force difference characteristics of unsteady tires under unsteady conditions was analyzed. The vehicle stability testing system was established and the actual vehicle test was carried out to verify the effectiveness of the vehicle model. The model was simulated by using MATLAB with fixed steering angle and constant braking condition. The results show that the tire and pavement properties have a relatively small influence on the difference characteristics of the longitudinal forces of the tires and have a significant effect on the differential characteristics of the lateral forces and the vertical loads of the tires. The difference of the lateral forces and the vertical loads of the tires is the result of tire footprint One of the main reasons for hidden features.