Research On The Optimization Of Rollover Safety Performance Of Full Load Passenger Car

In road transport, due to the large passenger capacity, once an accident occurs, there are many casualties. The bus accident includes frontal collision, side collision, rear end collision and rollover, rollover accident type and is the most likely cause of death. Therefore, it is significant to study the safety performance of coach rollover to protect people's lives and propert. In this paper, the research on the safety performance of full load passenger car rollover is studied(1) A three dimensional CAD model of full load coach frame was established by UG.Based on the HyperMesh platform, the three-dimensional finite element model of the coach rollover was established by meshing, material property, contact definition and boundary conditions.(2) The coach rollover simulation was calculated based on the LS-DYNA platform. Then the simulation results were processed by HyperView. The energy change, deformation characteristics and production space invasion of coach rollover are analyzed.(3)The original non penetrating type of the waist beam joint form was changed to through type joint type and then two kinds of forms were introduced into the coach body segment, and the rollover simulation was carried out respectively, and the deformation and stress levels of the two were compared and analyzed. The results show that the deformation resistance of the coach was improved by 22% and the stress at the joint of the beam is reduced.(4) Based on the MADYMO and LS-DYNA platform, the simulation model of the coach body segment rollover is built, and the simulation analysis is carried out.(5) Based on the response surface methodology, the geometric dimensions and the yield strength of the key components of coach were selected as the design variables, and the occupant injury value in the rollover was taken as the optimization objective. Based on the uniform test design, the simulation test of the coach rollover was carried out, and the response surface model was established by the regression analysis of the test data. Finally, genetic algorithm was used to obtain the optimal design parameters of the key components. The results showed that the occupant injury directly to the optimization of bus structure as the goal, not only to meet the requirements of ECER66 for the strength of bus structure, and also the occupant head injury HIC decreased by 35.32%, chest injury decreased by 33.03%, this method can effectively improve the safety performance of coach rollover.