Analysis on fractal characteristics of the ballastless track irregularities of high-speed railways
LI Zaiwei1, WU Pengfei1, LIU Xiaozhou2, HE Yuelei1
1.School of Urban Rail Transportation, Shanghai University of Engineering Science, Shanghai 201620,China;
2.School of Urban Transportation and Logistics, Shenzhen Technology University, Shenzhen 518118,China
Abstract:Ballastless track irregularities, as a direct indicator of the line's service status, have always been the core of high-speed railway inspection and maintenance operations. In order to deeply and effectively grasp the temporal and spatial distribution characteristics of ballastless track irregularities, starting from the basic physical meaning of fractal geometry, analyzing the fractal characteristics of track irregularities, comparing and selecting the calculation methods of the fractal dimension of track irregularities, by analyzing typical high-speed railways Accumulated inspection data of ballastless track irregularities, discuss the feasibility and rationality of fractal dimension for track section quality management. The results show that track irregularities have typical fractal characteristics of self-similarity and scale invariance; the results of track irregularity calculations by various fractal dimension methods have significant differences, and the calculation accuracy and robustness of the variation method are better. It is suitable for calculating the fractal dimension of track irregularity; the fractal dimension can effectively characterize the trend of deteriorating service status of the track, and it is less disturbed by the line operation and maintenance. It is suggested to further study the characteristics of the fractal dimension of track irregularities under different track conditions based on the specific maintenance conditions of the track.
李再帏1,吴鹏飞1,刘晓舟2,何越磊1. 高速铁路无砟轨道不平顺分形特征分析[J]. 振动与冲击, 2022, 41(6): 281-288.
LI Zaiwei1, WU Pengfei1, LIU Xiaozhou2, HE Yuelei1. Analysis on fractal characteristics of the ballastless track irregularities of high-speed railways. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(6): 281-288.
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