A Construction Method of Simplified Model for Rail Train Collision Simulation

Abstract

The invention discloses a construction method of a rail train collision simulation simplified model. The construction method comprises the following steps: carrying out response surface division on atarget intermediate train; performing a collision simulation experiment to obtain response displacement and response force of each response surface at a preset collision speed; identifying each interval section as a plastic deformation interval section or an elastic deformation interval section based on the deformation amount of each interval section, and calculating the rigidity of each elastic deformation interval section, the deformation amount being related to the response displacement of the response surface, and the rigidity being related to the response displacement and the response force of the response surface; and then constructing a rail train collision simulation full model, and replacing the elastic deformation interval sections of all intermediate trains on the rail train collision simulation full model by mass points and discrete beam units based on the calculated rigidity. By means of the method, more reasonable and accurate simplification is achieved.

Description

technical field [0001] The invention belongs to the technical field of vehicle collision simulation, in particular to a method for constructing a simplified model for rail train collision simulation. Background technique [0002] Train collision accidents will greatly threaten the personal safety of passengers and cause serious property losses. Therefore, the crashworthiness of rail trains has become the focus of research in the field of train safety. However, the actual vehicle crash test requires a huge amount of manpower, material and financial resources, and the repeatability of the experiment is extremely low. Therefore, the use of simulation technology to conduct vehicle crash research has become an important means. Effective simplification of trains can improve computational efficiency and reduce computational costs, such as The existing simulation technology is generally based on nonlinear finite element numerical simulation technology, and the finite element model ...

AI Technical Summary

Problems solved by technology

However, the actual vehicle crash test requires a huge amount of manpower, material and financial resources, and the repeatability of the experiment is extremely low. Therefore, the use of simulation technology to conduct vehicle crash research has become an important means. Effective simplification of trains can improve computational efficiency and reduce computational costs, such as The existing simulation technology is generally based on nonlinear finite element numerical simulation technology, and the finite element model of multi-group trains has a problem of large number of grids, which will consume more calculation costs. Therefore, the simplified train modeling method is very important for improving Computing efficiency, reducing computing cost is crucial

[0003] At present, Nanjing University of Aeronautics and Astronautics has proposed a patent of "a method of vehicle collision simulation based on parametric design", which uses nonlinear finite element software to calculate the impact force-stroke of the energy-absorbing components of the train and determine the equivalent total stiffness of the energy-absorbing device , combining the two methods of nonlinear finite element and nonlinear multi-body dynamics to simulate the collision of the whole vehicle, but it is mainly aimed at the energy-absorbing elements between the cars, and does not reveal or provide the simplification of the rail train body structure; Central South University Proposed the patent "A Model Simplification Method for Multi-vehicle Collision Simulation of Railway Trains", using the dynamic nonlinear large-deformation finite element method to simplify the head car and the middle car that make up the whole train, and extract the middle car that does not undergo plastic deformation for a single car position and calculate its total mass and center position, replace them with corresponding mass points, and connect the nodes of the rest of the car body with beam elements; although the model is simplified by using mass points and beam elements, this technology does not provide The realization scheme of the equivalent stiffness of the body structure, and the stiffness of each part of the same car body is quite different, and the scheme does not analyze the rigid body of each part of the car body, so the rationality, effectiveness and reliability of the model simplification method Accuracy still needs to be improved

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