scholarly journals Simulation Analysis of a Multiple-Vehicle, High-Speed Train Collision Using a Simplified Model

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Suchao Xie ◽  
Weilin Yang ◽  
Ping Xu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Speed ◽  
Large Scale ◽  
Computing Time ◽  
Element Model ◽  
Vehicle Body ◽  
Railway Vehicle ◽  
Storage Space ◽  
High Speed Train

To solve the problems associated with multiple-vehicle simulations of railway vehicles including large scale modelling, long computing time, low analysis efficiency, need for high performance computing, and large storage space, the middle part of the train where no plastic deformation occurs in the vehicle body was simplified using mass and beam elements. Comparative analysis of the collisions between a single railway vehicle (including head and intermediate vehicles before, and after, simplification) and a rigid wall showed that variations in impact kinetic energy, internal energy, and impact force (after simplification) are consistent with those of the unsimplified model. Meanwhile, the finite element model of a whole high-speed train was assembled based on the simplified single-vehicle model. The numbers of nodes and elements in the simplified finite element model of the whole train were 63.4% and 61.6%, respectively, compared to those of the unsimplified model. The simplified whole train model using the above method was more accurate than the multibody model. In comparison to the full-size finite element model, it is more specific, had more rapid computational speed, and saved a large amount of computational power and storage space. Finally, the velocity and acceleration data for every car were discussed through the analysis of the collision between two simplified trains at various speeds.

Study of Bridge Piers Lateral Stiffness in Railway Vehicle-Bridge System

2014 ◽  
Vol 1025-1026 ◽  
pp. 868-871
Author(s):  
Jia Yu Yuan ◽  
Zhi Ping Zeng ◽  
Can Liu ◽  
Xian Feng He ◽  
Kun Teng Zhu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Speed ◽  
System Analysis ◽  
Element Model ◽  
Railway Vehicle ◽  
Lateral Stiffness ◽  
Coupled Vibration ◽  
High Speed Railway ◽  
Bridge Model

With the high-speed railway construction, studying of the vehicle-bridge vibration system increasingly important. This article established a range of high-speed trains linear model and standard high-speed railway 32 m span bridge model then a combination of both established based on ANSYS vehicle-bridge finite element model. Followed based on ANSYS high-speed train-bridge Coupled Vibration Simulation Analysis System. Analysis of a variety mound lateral stiffness, According to the analysis results of the piers of the basic principles. The bridge has been established based on the finite element model. Respectively, from the height of piers and pier-shaped two aspects to computational analysis the piers for bridge Coupled Vibration of Dynamic Response of Bridges. Provide a reference for the design of high-speed railway.

Mechanical Analysis of a Cowcatcher for a High-Speed Train in Crashing

2013 ◽  
Vol 437 ◽  
pp. 18-21
Author(s):  
Song Yan Li ◽  
Zhi Jun Zheng ◽  
Ji Lin Yu
Keyword(s):  
Finite Element ◽  
Kinetic Energy ◽  
Finite Element Model ◽  
High Speed ◽  
Element Model ◽  
Rigid Wall ◽  
Mechanical Analysis ◽  
Front Part ◽  
High Speed Train ◽  
Car Crashes

A finite element model of a cowcatcher mounted at the front of a high-speed train is established and the processes when the head car crashes a rigid wall or an obstacle at different speeds are simulated by using ANSYS/LS-DYNA software. The results show that with the cowcatcher the passenger deceleration would decrease and the kinetic energy can be absorbed more quickly when the head car crashes a rigid wall. When a train crashes an obstacle on the track at a low speed, say 10m/s, the obstacle is turned up, which may destroy upper structures of the train. When the speed is high, say 50m/s, the obstacle will crash into the cowcatcher and the kinetic energy of the train will be absorbed by the front part of the cowcatcher.

Research on the Effects of Welding Sequence on Welding Residual Stress of High-Speed Train Based on SYSWELD

2011 ◽  
Vol 399-401 ◽  
pp. 1806-1811
Author(s):  
Yong Hong Chen ◽  
Peng Chen ◽  
Ai Qin Tian
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
High Speed ◽  
Element Model ◽  
Welding Residual Stress ◽  
High Speed Train ◽  
Distribution Law ◽  
Element Analysis ◽  
Welding Sequence ◽  
Maximum Residual Stress

The finite element model of the roof of aluminum high-speed train was established, double ellipsoid heat source was employed, and heat elastic-plastic theory was used to simulate welding residual stress of the component under different welding sequence based on the finite element analysis software SYSWELD. The distribution law of welding residual stress was obtained. And the effects of the welding sequence on the value and distribution of residual stress was analyzed. The numerical results showed that the simulation data agree well with experimental test data. The maximum residual stress appears in the weld seam and nearby. The residual stress value decreases far away from the welding center. Welding sequence has a significant impact on the final welding residual stress when welding the roof of aluminum body. The side whose residual stress needs to be controlled should be welded first.

Simulation and Experimental Research on Milling Force of High Manganese Steel

2010 ◽  
Vol 143-144 ◽  
pp. 863-867
Author(s):  
Yong Tang ◽  
Qiang Wu ◽  
Xiao Fang Hu ◽  
Yu Zhong Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Speed ◽  
Shear Failure ◽  
Element Model ◽  
Manganese Steel ◽  
High Manganese ◽  
Milling Force ◽  
High Manganese Steel ◽  
High Speed Milling

The milling process of hard-to-cut material high manganese steel ZGMn13 was simulated and experimental studied based on Johnson-Cook material model and shear failure model.The high speed milling processing finite element model has established adopting arbitrary Lagrangian-Euler method (ALE) and the grid adaptive technology,The influence of milling parameters to milling force is analyzed in the high speed milling high manganese steel process. The simulated and experimental results being discussed are matched well. It certifies the finite element model is correct.

Validation of a New Finite Element Model for Human Knee Ligaments for Use in High Speed Automotive Collisions

2009 ◽  
Author(s):  
Chiara Silvestri ◽  
Louis R. Peck ◽  
Kristen L. Billiar ◽  
Malcolm H. Ray
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Strain Rate ◽  
High Speed ◽  
Element Model ◽  
Knee Ligament ◽  
Knee Ligaments ◽  
Human Knee ◽  
Dynamic Representation ◽  
Failure Properties

A finite element model of knee human ligaments was developed and validated to predict the injury potential of occupants in high speed frontal automotive collisions. Dynamic failure properties of ligaments were modeled to facilitate the development of more realistic dynamic representation of the human lower extremities when subjected to a high strain rate. Uniaxial impulsive impact loads were applied to porcine medial collateral ligament-bone complex with strain rates up to145 s−1. From test results, the failure load was found to depend on ligament geometric parameters and on the strain rate applied. The information obtained was then integrated into a finite element model of the knee ligaments with the potential to be used also for representation of ligaments in other regions of the human body. The model was then validated against knee ligament dynamic tolerance tests found in literature. Results obtained from finite element simulations during the validation process agreed with the outcomes reported by literature findings encouraging the use of this ligament model as a powerful and innovative tool to estimate ligament human response in high speed frontal automotive collisions.

scholarly journals Three-Dimensional Response of the Supported-Deep Excavation System: Case Study of a Large Scale Underground Metro Station

Geosciences ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 76
Author(s):  
Ashraf Hefny ◽  
Mohamed Ezzat Al-Atroush ◽  
Mai Abualkhair ◽  
Mariam Juma Alnuaimi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Large Scale ◽  
Three Dimensional ◽  
Element Model ◽  
Two Dimensional ◽  
Deep Excavation ◽  
Metro Station ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The complexities and the economic computational infeasibility associated in some cases, with three-dimensional finite element models, has imposed a motive for many investigators to accept numerical modeling simplification solutions such as assuming two-dimensional (2D) plane strain conditions in simulation of several supported-deep excavation problems, especially for cases with a relatively high aspect ratio in plan dimensions. In this research, a two-dimensional finite element model was established to simulate the behavior of the supporting system of a large-scale deep excavation utilized in the construction of an underground metro station Rod El Farrag project (Egypt). The essential geotechnical engineering properties of soil layers were calculated using results of in-situ and laboratory tests and empirical correlations with SPT-N values. On the other hand, a three-dimensional finite element model was established with the same parameters adopted in the two-dimensional model. Sufficient sensitivity numerical analyses were performed to make the three-dimensional finite element model economically feasible. Results of the two-dimensional model were compared with those obtained from the field measurements and the three-dimensional numerical model. The comparison results showed that 3D high stiffening at the primary walls’ corners and also at the locations of cross walls has a significant effect on both the lateral wall deformations and the neighboring soil vertical settlement.

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