The Optimization Of BIW Structure Based On The Vehicle Side Impact Virtual Simulation

As the vehicle design tend to the high-speed and lightweight, the traffic accidents and the amount of injury and death are increasing with the increasing of the number of vehicle possession year by year. The vehicle passive safety is primary direction of the world’s modern vehicle technology.This dissertation’s backdrop based on side impact the standard that began executing in China,According to C-NCAP side impact standard, consulting certain vehicle’s side impact results of testing and side impact virtual simulation, optimizing the BIW structure base on the ensuring vehicle side impact safety performance. Advanced some proposals for the different structure. The structure optimization’s target is reducing vehicle mass and manufacture’s cost. The paper expatiated FEA theory, modeling method, modeling process and side impact value index, introducing the optimization’s all course and summarizing deeply for the BIW structure passive safety technology.First, the paper pointed out the import for researching side impact safety, summarized FEA development course in vehicle industry,analyzing researching level and tend of crash safety in China and foreign, detailed introduced the impact regulations and method in China and foreign later, analysis our country’s impact regulations require and characteristic. And then, discussed the FEA theory and element type, essential equation for simulation, integral arithmetic etc, established vehicle side impact FEA model. According to the country side impact regulation, performed side impact simulation. Compared the analysis results with the real vehicle test, making the baseline for the next model modification. By analyzing effects to side impact from B pillar, closure, lower sill, seat crossbeam etc, advanced some structure optimization proposals and performed the every case to find the best result. Finally, testing again the real vehicle side impact and BIW stiffness to prove the FEA result’s correct. The results show that, we could through optimization to ensure side impact safety requirement and stiffness requirement when changing BIW structure and reducing mass.In this paper, an approach for the study, the conclusions and improvement measures for side impact performance can provide reference about carrying out automotive side impact crashworthiness performance of automotive design.