Rail straightness is an important index of the quality of large components of steel rails, and is of great significance for product quality testing in rail plants. At present, the measurement of straightness in rail factories still depends on the manual use of straightness rulers for measurement, which leads to low measurement speeds and precision. Therefore, we propose a non-contact measurement method based on the outer boundary support point model. Using laser profilers to measure the original curve of the rail straightness, the proposed straightness curve processing algorithm in this paper is used to obtain the median filter curve and calculate the maximum difference values. Results show excellent performance and indicate that the proposed method presents a better straightness measurement approach than traditional manual measurements using physical straightness rulers.

钢轨平直度是钢轨大型部件质量的重要指标，对于钢轨工厂的产品质量测试具有重要意义。目前，铁路工厂中直线度的测量仍取决于手动使用直线度尺进行测量，这导致测量速度和精度较低。因此，我们提出了一种基于外边界支持点模型的非接触式测量方法。利用激光轮廓仪测量钢轨平直度的原始曲线，本文提出的平直度曲线处理算法用于获得中值滤波曲线并计算最大差值。