Running safety evaluation of a 350 km/h high-speed freight train negotiating a curve based on the arbitrary Lagrangian-Eulerian method

Abstract

To adapt to the rapid growth of the logistics market and further improve the competitiveness of railway transportation, the high-speed freight train with a design speed of 350 km/h is being developed in China. The safety of the train under great axle load of 17 t and dynamic load is unknown. This paper is aimed to study the running safety of the high-speed freight train coupled with various cargo loading conditions negotiating a sharp curve at high velocity. A numerical model integrated a fluid-structure coupled container model and the nonlinear high-speed freight train was set up by the software of LS-DYNA. The fluid-structure interaction model between the container and fluid cargo was established using the Arbitrary Lagrangian-Eulerian (ALE) method. Two influencing parameters, including the cargo state in the container and the fill level, were selected. The study results showed that the wheelset unloading ratio and overturning coefficient could be significantly affected by the liquid sloshing, while the influence of sloshing on the risk of derailment was slight. In general, increasing the cargo filling rate would contribute to vehicle operation safety. In conclusion, this study would provide theoretical help for the running safety of the newly designed high-speed freight train.

A mechanical equivalence similitude method for dynamic responses of high-speed train middle vehicles in a collision

“…The contact between the wheel and the rail was defined with “AUTOMATIC_SURFACE_TO_SURFACE” contact algorithm. 30 The friction coefficient between the wheel and rail was 0.2. 31 The model impacted a fixed rigid wall at an initial velocity of 3 m/s.…”

“…The contact between the wheel and the rail was defined with "AUTOMATIC_SURFACE_TO_-SURFACE" contact algorithm. 30 The friction coefficient between the wheel and rail was 0.2. 31 To balance high accuracy with efficiency, the end area of the vehicle body was discretized by 10 mm shell elements and the vehicle body rear was discretized by 20 mm shell elements.…”

Review of freight high speed railway (HSR)

“…Including comparative analysis of the use of air transport and HSR [47,56], as well as the punctuality of express parcels transport by various means of transport [32] and the selection of optimal locations of consolidation centers to reduce GHG [9], mainly on China example. Works related to Freight HSR also include the development of tracking of transported goods [57], intelligent management systems [6], monitoring and calculations related to the rolling stock [3,16] and issues related to the aerodynamics of HSR vehicles [50].…”