Abstract
The influence of elastic wave propagation along the carriage in high-speed trains on the coordination of energy absorber components is analyzed in this paper. A simplified model is developed to simulate a “like to like” impact scenario of trains with distributed energy absorbing system. A rod made of elastic material is used to simulate a carriage, while the rigid-perfectly plastic-locking (R-PP-L) model is employed to describe the material of the energy absorber. The problem is simplified to a one-dimensional case. The response of absorption components during collision is divided into several stages and the corresponding governing equations of the impact response are obtained and numerically solved. A typical platform phenomenon of response in all stages is observed. The results of theoretical analysis are compared with those of finite element simulation and good agreement is achieved.
Highlights
The active and passive safety technology has received much attention with the development of high-speed trains
For the definition of stage employed in this paper, interfacial velocities change once every two stages, which is equal to a time length of an elastic wave traveling back and forth between the two interfaces
5 Typical velocity-time history (a) and stress-time history (b) of interfaces A1, A2 and A3. 4.2 Comparison with finite element results Finite element method with ABAQUS/Explicit code is employed to verify the correctness of the theoretical analysis
Summary
The active and passive safety technology has received much attention with the development of high-speed trains. Numerical simulation combined with theoretical analysis becomes the most commonly used and economical measure. A train is a so long structure system that the length involved in the event increases with the passage of time and the impact load propagates from the front to the rear of a carriage in the form of elastic wave. In order to develop the energy absorbing system, the effect of stress wave propagation along the train should be considered. A simplified one-dimensional model, which takes the distribution of energy absorbing devices and the elasticity of the train carriages into consideration, is developed for a “like to like” impact scenario of trains. The results are compared with those of finite element (FE) simulation
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