Quantitative Detection Method for CRTS Ⅱ Slab Gap Based on Characteristic Values of Elevation Difference of Track Structure
The detection of gap damage of ballastless high-speed rail tracks is crucial for ensuring train safety.This paper presented a quantitative detection method for gaps based on the characteristic values of relative elevation difference be-tween the track slab and the support layer.A prototype system for gap detection was constructed by integrating linear structured light sensors to capture the track contour lines.By dividing the contour lines into three segments based on the track structure,the lines were fitted separately using the RANSAC algorithm to calculate the distance between the inter-section points of the fitted lines,which was used as the the characteristic value of the track structure elevation difference.By using the sleeper position as the benchmark for mileage location and comparing the multiple detection results of track structure elevation difference values within the same section,the length and height values of the gap damage were pre-cisely calculated through variations.The results from high speed line tests conducted on this basis show that the standard deviation coefficient of the repeated measurements by the detection system remains within 2％.At a 95％confidence lev-el,the deviation of repeated measurements is less than 0.25 mm.Comparing the detection results with the current fault database of railway companies,the mean absolute errors for gap height and length detection results are 0.24 mm and 0.34 m,with the mean squared logarithmic error values of 0.011 and 0.017,respectively.
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