Grinding Measures of Small Radius Rail Based on NURBS Curve
To design a personalized rail grinding profile to reduce the rail wear of small radius curve and improve the passing performance of the small radius curve of train.Firstly,based on the cubic NURBS curve,the existing standard rail grinding profile of CHN60 in China is derived.Secondly,the measured small radius curve wear rail representative profile is selected using the Fréchet distance method.Thirdly,based on the differential evolution algorithm,the personalized rail grinding profile is iteratively optimized.Finally,a coupling dynamic model is established based on SIMPACK to calculate the relevant parameters of personalized grinding profile and CHN60 standard grinding profile.The results show that compared with the CHN60 standard grinding profile,the personalized grinding profile wear index is reduced by 17.76%,the derailment coefficient,wheel load reduction rate,wheel-rail lateral force and wheel-rail vertical force are reduced by 30.38%,11.84%,21.28%and 0.37%respectively.
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