Simplified Rail Vehicle Model for Collision Simulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing simplification methods for Finite Element (FE) simulation models of train collisions are inadequate for analyzing complex train accident scenarios, as they fail to consider lateral impacts and cannot accurately simulate actual collision conditions, including secondary impact injuries to train occupants.
Innovation Solution
A method and system for constructing a simplified railway vehicle model that retains the exterior shape of the car body, allowing for simulations of both longitudinal and lateral impacts, and enables the placement of dummy models for secondary collision simulations. The model is constructed using a solid single-shell structure for the middle section and hollow double-shell structures at the ends, with a simplification thickness ratio applied to adjust the model's design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed train models with enormous numbers of element meshes and nodes are used for FE simulations, then collision accuracy is improved, but computational efficiency deteriorates and storage space requirements increase
Solution Approach 1:
The train model is segmented into different zones: the front and rear car bodies are modeled in detail while the middle car bodies are simplified. This segmentation allows the model to maintain collision accuracy in impact zones while reducing overall computational complexity and mesh element count, directly resolving the contradiction between detailed modeling and computational efficiency.
Solution Approach 2:
Different levels of modeling detail are applied to different parts of the train: detailed modeling is concentrated in the front and rear car bodies where collisions occur, while the middle sections use simplified representations. This local quality approach ensures high collision accuracy where needed while minimizing computational burden in non-critical areas.
2Productivity
If middle sections of car bodies are replaced with mass points and 1D beam elements, then computational efficiency is improved, but the ability to simulate lateral impacts and study secondary occupant injuries deteriorates
Solution Approach 1:
The train model is segmented into different zones: the front and rear car bodies are modeled in detail while the middle car bodies are simplified. This segmentation allows the model to maintain collision accuracy in impact zones while reducing overall computational complexity and mesh element count, directly resolving the contradiction between detailed modeling and computational efficiency.
Solution Approach 2:
Different levels of modeling detail are applied to different parts of the train: detailed modeling is concentrated in the front and rear car bodies where collisions occur, while the middle sections use simplified representations. This local quality approach ensures high collision accuracy where needed while minimizing computational burden in non-critical areas.
Data Source
AI summary
The disclosure provides a construction method including steps of: constructing a detailed model and a simplified model of the rail vehicle using finite element method based on the three-dimensional structure of the rail vehicle; initially setting the simplified model in accordance with the detailed model, including specifying materials, mechanical properties parameters, and mass point; setting different simplification thickness ratio to obtain a plurality of sets of the simplified models, designing longitudinal and lateral collision conditions, and in each type of the collision conditions, performing collision simulations on the detailed model and each set of the simplified models under each thickness ratio to obtain respective collision response curves; calculating a total CORA value corresponding to the plurality of sets of the simplified models; selecting an optimal simplified model from n sets of the simplified models with the highest total CORA values.