Analysis of handling performance based on simplified lateral vehicle dynamics

In this article, the analysis methods for vehicle handling performance are studied. Using simple models, dynamic characteristic parameters such as yaw, natural frequency, and the damping coefficient of a vehicle can be theoretically formulated. Here, the vehicle is simplified by a bicycle (single-track) model, and the tire is modeled by an equivalent cornering stiffness and first order lag. From the experimental road data, the tire model parameters (equivalent cornering stiffness and time lag constant) are extracted. These parameters are then inserted into the theoretically formulated equations of dynamic characteristic parameters. For the purpose of validating the efficiency of the suggested methods, experimental road tests (where the cars have different handling performances) are performed. The results show that vehicle handling performance can be sufficiently represented by the suggested dynamic characteristic parameters. So, it is concluded that the proposed method has practical use for the development of new cars or for the comparison of similar cars since the evaluations of the vehicle handling performance can be efficiently determined by the suggested dynamic characteristic parameters.     

车辆侧向响应特性的多参数影响分析

建立了基于非线性轮胎侧偏特性的四轮车辆数值模型,考虑了轮胎垂直载荷的侧向转移,用该模型计算了车辆转向角阶跃输入下的侧向速度和横摆角速度响应,计算结果表明车辆质心纵向位置对车辆侧向响应特性具有较大的影响,而车辆转动惯量和轮间距对车辆侧向响应特性几乎没有影响.车辆响应特性随车辆质心纵向位置约呈指数关系变化,车辆质心越向前移,横摆角速度的响应也越快但超调量也随之增加.     

手持式智能轮胎沟槽深度检测系统设计

针对传统轮胎沟槽深度测量工具检测效率极低、数据不准确、测量维度少和延展性差等特点，设计了一种手持式智能轮胎沟槽深度检测系统。该系统由手持式智能检测设备、手机和云平台三部分组成。手持式智能轮胎检测设备负责采集和处理轮胎沟槽深度数据；手机负责传输和显示轮胎沟槽深度数据；云平台负责分析和存储轮胎沟槽深度数据。试验结果表明，该轮胎花纹深度数据处理算法抗干扰能力强，该手持式智能轮胎沟槽深度检测系统测量效率高，可扩展性强且精度高，每条轮胎检测平均用时4 s，检测数据误差保持在3.5%范围内。     

智能轮胎下沉量实时监测系统设计

从利用轮胎下沉量表征轮胎承载状态的角度出发，设计了一款智能轮胎下沉量实时监测系统，利用单片机处理模块实现对气压、温度、激光测距传感器的集成控制，并采用无线传输的方式将各传感器采集获取的数据传送至上位机显示。经测试，系统工作稳定，满足基本使用要求。     

基于边界分析的重载轮胎滚动过程接地角和印记非对称性分析与验证

基于解析弹性基础的柔性胎体模型,并考虑胎体圆环的径向变形与切向变形之间的耦合关系,为重载大扁平比轮胎建立了柔性环二维轮胎低频动力学模型。采用接地边界求解方法探究了轮胎的接地滚动过程中的接地角和接地印记的非对称特性,并进行了轮胎接地刚度和接地印记非线性实验验证。结果表明:采用接地边界求解可准确计算接地角和接地印记;基于胎内应变传感器的接地印记估计方法可间接测量轮胎滚动过程中的接地印记。