Tire-Road Contact Stress in Virtual Rail Trains Under Braking Conditions
To address the problem of serious road damage at stations and intersections during the trial run of virtual rail trains,the vehicle-tire-road interaction is considered,and the dynamic tire forces are obtained by constructing a virtual rail train dynamics model with Abaqus finite element software to develop a tread tire and viscoelastic asphalt pavement model,and the tire-road contact stresses at uniform speed and under braking conditions are analyzed and compared based on the arbitrary Lagrange-Euler(ALE)method.The contact stress characteristics of tire and pavement at uniform speed and under braking conditions are analyzed and compared based on the ALE method,and the effects of slip rate and load on the contact stress of braking conditions were studied.The results show that the longitudinal stress during braking is the main cause of road damage,and the slip rate and load have a significant effect on the contact stress during braking.The maximum longitudinal stress under braking conditions increases by approximately 979 kPa compared to uniform speed conditions.When the slip rate increases from 0.02 to 0.06,the maximum longitudinal stress increases by approximately 99.8%.When the load increases from 40 kN to 50 kN,the maximum longitudinal stress at the edge of the tire increases by approximately 98.8%.Therefore,braking should be avoided as much as possible when the train is running,and at the same time the train load should be in a reasonable range.
virtual track trainvehicle dynamicstire-road contact modelcontact stressfinite element analysis
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