Since 2000, Europe has studied the railway vehicle crash safety standards.
TSI was defined based on the collision safety of a train that must satisfy the requirement for an operation in the European. In Korea, standards for safety of railway vehicles are implemented to meet the collision safety performance at the specified speed to the vehicle classification.
Therefore, to be applied to the large-capacity energy absorber between the vehicles to the safety performance of a collision condition, the energy-absorbing capacity is specified by a crash simulation. Current was applied to the national railway vehicle impact energy absorbing device to the rubber buffer or hydraulic shock absorber on the vehicles front end.
However, the hydraulic shock absorber has different characteristic curves that are generated according to the speed and configuration conditions of the vehicles which are caused by a phenomenon that has speed-dependent fluid properties. In the case of using the deformation of the tube. This will have little impact on the speed due to the use plastic deformation of the material. In particular deformations of energy absorbance. This is used extensively for vehicle combinations medium. But most deformation tubes are applied to domestic products by foreign technology. The core of the tube is designed to maintain a constant Deformation Reaction force to the compression displacement. The displacement and Reaction force is determined by the energy absorbing capacity. Contact between the tube and the punch is due to the compression action which generates friction and tube expansion that is represented as a reaction.
In particular, the tube thickness and punch the contact angle can see the tendency to force change through the design elements of variable adjustment. Analysis by the models and variables calculated in accordance with the conditions through a result of the graphical model. The test results may confirm the inclination based on a specific parameter.
By arranging the change of the reaction force due to a specific variable continuously, confirms the trend by comparing the model. Trends are the basis for determining the degree to which the variable contributes to energy absorption and the data of the design to increase the energy absorption efficiency of the same model. Analysis was conducted based on the model using the ABAQUS finite element analysis program, and compared with the actual test results. Test models were made in the same shape as the FE model.