基于光学原理的轮胎-路面接触现象试验研究

Experimental Study on Tire-Pavement Contact Phenomenon Based on Optical Principe

基于光全反射的光学原理设计测量轮胎接地压力分布的试验台架。对影响试验台架校准的因素包括相机系统、环境光以及校准材料进行研究。为准确获取轮胎接地压力分布的边界,对比了多种图像分割算法,通过联合分割优化算法将图像中轮胎与玻璃的接触区域与非接触区域进行有效分割。将光学方法与Tekscan压力传感器获取的接地压力分布进行了对比,结果表明光学方法与Tekscan压力传感器得到的轮胎接地压力分布特性指标具有较高的一致性,证明了光学方法的可靠性。在此基础上研究了轮胎动态接地压力分布。

The test bench for measuring the grounding pressure distribution of the tires was designed based on the optical principle of total light reflection.Factors affecting the test bench calibration,including camera system,ambient light and calibration materials were studied.In order to accurately obtain the boundary of the tire grounding pressure distribution,a variety of image segmentation algorithms were compared,and the contact region between the tire and glass and the non-contact region in the picture were effectively segmented by joint segmentation optimization algorithm.The grounding pressure distribution obtained by optical method was compared with that of Tekscan pressure sensor.The results showed that the tire grounding pressure distribution characteristic index obtained by the optical method was highly consistent with that obtained by Tekscan pressure sensor,which proved the reliability of the optical method.On this basis,the dynamic ground pressure distribution of the tire was studied.