Study on the Rail Corrugation at Weld Joint of Steel Spring Floating Slab Track II：Formation Mechanism

doi:10.3901/JME.2025.06.260

Abstract

Abstract: The long-wavelength of 250-600 mm has been observed on a straight line of steel spring floating slab track in a metro of china. The operation speed is approximately 60 km/h and the corrugation-passing frequency is 28-67 Hz. A test was performed with an impact hammer to identify the actual vibration response of the floating slab track. A rigid-flexible metro vehicle and floating slab track dynamic model is established, in which the car body is considered as a rigid body, the rail is simulated by Timoshenko beam, the slab and lining are simulated by three-dimensional solid elements, and the shear force dowels are simulated by beam elements. This dynamic model is used to study the correlation between the vibration response of track, the creep characteristic of wheel-rail, the wheel-rail force and the corrugation. The three-dimensional finite element model of unsprung and floating slab track is established, which is used to analyze the formation mechanism of corrugation combined with the vehicle-track dynamic model. Numerical results show that the long-wavelength corrugation at the weld joint belongs to P2 resonance corrugation, and its formation mechanism is the vibration of the unsprung mass and the rail as whole relative to the floating slab. The lateral and torsional vibration of the rail relative to the floating slab, the fluctuation of wheel-rail normal force and the wheel-rail lateral creepage are also important factors for the formation and evolution of corrugation.

Key words: rail corrugation, steel spring floating slab track, weld joint, formation mechanism, vibration

CLC Number:

U260

LI Xia, WU Lei, WEN Zefeng, JIN Xuesong, WANG Anbin. Study on the Rail Corrugation at Weld Joint of Steel Spring Floating Slab Track II：Formation Mechanism[J]. Journal of Mechanical Engineering, 2025, 61(6): 260-267.

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