• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (6): 177-183,193.doi: 10.3901/JME.2022.06.177

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Effects of Mortar Void of CRTS Ⅱ Slab Track on the Dynamic Performances of Vehicle-track System

XIN Xin, REN Zunsong, WEI Xue   

  1. College of Mechanical and Electronic Control, Beijing Jiaotong University, Beijing 100044
  • Received:2021-07-22 Revised:2021-12-25 Online:2022-03-20 Published:2022-05-19

Abstract: In order to study the effect of the mortar void of CRTS Ⅱ slab ballastless track system on the dynamic responses of the vehicle and track structures, a CRH2 vehicle-flexible track coupled dynamics model is established by the finite element software ANSYS and dynamics simulation software SIMPACK. Under the conditions of through-transverse mortar void, the influences of different positions and longitudinal lengths of mortar void on the vertical wheel-rail contact force, wheel load reduction rate, vertical acceleration of the car body, vertical displacements of track structures and tensile stress of slab are analyzed. The results show that the vertical displacement and tensile stress of the slab are most affected by the mortar void, which can be used as a measure of whether the wheel-rail system meets the safety requirements when the mortar void occurs. The vehicle responses and track displacements are basically the same as the impact of the unilateral and symmetric void of the same slab ends, but the impact of the void of the adjacent slab ends is more significant; The unilateral void of the slab end and the void of the adjacent slab ends have a relatively consistent effect on the tensile stress of the track slab, but the influence is less than the that of the symmetrical void of the same slab ends. When the length of the unilateral void of the slab end reaches 1.95 m as well as the void length of the symmetrical and adjacent slab ends reaches 1.3 m, the responses of the vehicle or track structures will approach or exceed the safety limit. By analyzing the dynamic responses of the wheel-rail system under different mortar void conditions, a reference for the maintenance of mortar void can be provided. Thereby reducing the times of track maintenance and saving maintenance costs, while prolonging the life of the track system and ensuring operation safety.

Key words: ballastless slab track, mortar void, dynamic responses, co-simulation

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