基于相位测量轮廓术的车轮踏面三维轮廓测量

Three-dimensional shape measurement of wheel tread and surface based on phase measuring profilometry

随着轨道交通在高速和重载方面的快速发展,因车轮踏面缺陷和磨损导致的列车安全问题日益突出。提出了一种基于相位测量轮廓术(PMP)的重构车轮踏面轮廓的新方法,对车轮踏面的磨耗及缺陷进行检测。通过模拟不同程度的噪声,并使用行列展开法、最小二乘法、枝切法以及改进枝切法等4种相位展开算法的仿真试验,试验结果表明,改进枝切法展开误差小,抗噪性能强,运算速度快。搭建了试验测试平台,通过重构车轮踏面和缺陷车轮踏面的轮廓图验证了改进枝切法的有效性。

With the development of rail transit in speed and carrying capacity,the train safety problems caused by wheel tread defects and wear have become more prominent.A new method of reconstructing the wheel tread profile based on phase measurement profilometry(PMP)is proposed to detect the wheel tread defects and wear.In this paper,simulation experiments are carried out to compare the four phase unwrapping algorithms of the row and column expansion method,the least square method,the branch cutting method and the improved branch cutting method under different levels of noise.The experimental results show that the improved branch cutting method has the relatively smallest error,strong anti-noise performance and fast operation speed.The effectiveness of the improved method is verified by the reconstruction of the wheel tread and the defective wheel tread profile.