Abstract
Rail corrugation is a common railway defect that involves diverse and complex factors. Rail grinding is also the most commonly used method to address corrugations. Through numerous irregularity tests and one-third octave frequency spectrum analyses, this study determined the characteristics and development process for rail corrugation on high-speed rail tracks. The vibration transmission properties of the grinding train were tested using the force hammer impacting method. Thereafter, using a simulation, the influence of the vertical vibration behavior of the grinding stone and the stiffness of the hydraulics were determined. Through a series of field tests and numerical simulations, this study revealed a clear correlation between rail corrugation and rail grinding and confirmed that the technical operation of rail grinding is closely associated with regular grinding marks at a wavelength of approximately 60 mm on rail surfaces. The combination of the natural vibration of the grinding stone (frequency of 60 Hz) and an inappropriate operational process can aggravate the grinding marks on the rail surfaces, thereby forming an initial excitation of rail corrugation. Although a large number of irregularity tests are performed after rail grinding, these wavelength-fixing grinding marks can cause the formation and development of rail corrugation. Suggestions for improving the high-speed rail-grinding technology are also provided.
Highlights
Rail corrugation is one of the most significant problems faced by the railway industry worldwide, and it affects all types of railways. e formation and development of rail corrugation causes fierce vibrations in the structures of vehicles and tracks, noise [1], ground and building vibrations [2], reduction in the service life of the structural parts of vehicles and tracks [3], and reduction in vehicle ride comfort [4] and affects the wheel/rail dynamic force [5]
Corrugated rails result in considerable maintenance and replacement costs to transportation companies. erefore, understanding the mechanism of corrugation production and growth is essential. e phenomenon of rail corrugation has been observed and studied for over 100 years
According to state-of-the-art reviews on rail corrugation, studies have focused on field investigations and laboratory experiments, as well as theoretical and numerical modeling [3]
Summary
Rail corrugation is one of the most significant problems faced by the railway industry worldwide, and it affects all types of railways. e formation and development of rail corrugation causes fierce vibrations in the structures of vehicles and tracks, noise [1], ground and building vibrations [2], reduction in the service life of the structural parts of vehicles and tracks [3], and reduction in vehicle ride comfort [4] and affects the wheel/rail dynamic force [5]. In 2013, Li et al [9] investigated the corrugation mechanism of rails for both the tangent and curved tracks of a metro with Cologne fasteners, including extensive measurements at sites and a numerical analysis. Is corrugation model is more complete and complicated than those previously reported According to these published studies, rail corrugation formation and development are caused by factors that include the pinned-pinned resonance and P2 resonance of a track [24,25,26,27], torsional vibration of a wheelset [28,29,30], passing speed of a vehicle [[31], [32]], and fastening system stiffness [33, 34]. To the best of our knowledge, there are no reports on the possible negative effects of grinding on the development of rail corrugation. rough numerous irregularity tests and detailed analyses of rail corrugation, this study discusses the characteristics and development processes of rail corrugation in high-speed track systems and reveals a clear correlation between rail corrugation and rail grinding
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