Study On 100% Rigid Wall Collision Analysis And Structural Improvement Of A Vehicle

With the rapid development of the automobile industry,the frequency of traffic accidents is also rising,which causes non-negligible losses to people’s lives and property.In order to reduce the life threat and property loss caused by the collision accident,the research on the safety of automobile collision has become one of the most important links in the development of automobile.In order to improve the safety of cars in China,on the basis of collision safety laws and regulations,C-NCAP evaluation regulations were formulated with reference to relevant foreign laws and regulations,which put forward higher requirements for the safety of cars in China.In this paper,the research method of finite element simulation analysis of the vehicle frontal impact is adopted,and the simulation model of 100% rigid wall collision on the front of the vehicle is established according to the C-NCAP(version 2018)test requirements,so as to study the crashworthiness of the body front-end structure.Firstly,gridding of the whole vehicle model on the pre-processing platform of ANSA software,setting of parameters such as material attribute,connection and contact,setting of boundary and constraint conditions,and output of K file are carried out to obtain the complete vehicle model that can be used for analysis and calculation.Secondly,the ls-dyna software calculation platform was used to complete the calculation of 100% collision simulation of the vehicle,and the d3 plot and binout result files were obtained.Finally,the post-processing of the calculation results is carried out through the Hyper View and Hyper Graph software platform,and the crashworthiness of the vehicle is evaluated by judging the reliability of simulation analysis on the mass and energy curves in the collision,analyzing the acceleration curve and the deformation and energy absorption of key components.According to the analysis,the peak acceleration of the right b-pillar during the collision is slightly higher than the five-star evaluation index of C-NCAP,which can be further optimized.In addition,under the premise of ensuring the vehicle’s collision performance,the structure of the inner plate of the engine hood was improved for the purpose of reducing weight.Analyzes the improved collision results come to a conclusion: the structure of the improved engine cover plate,the collision performance meet the requirement of evaluation,and the B pillar fell slightly before peak acceleration is improved,and the modal,torsional stiffness and lateral stiffness structure performance meet the requirements,such as engine cover plate within 25.6% reduction in weight,to achieve improved,this improvement scheme can accept that.In this paper,the frontal impact of automobile is studied by finite element simulation method,and the structure of inner plate of engine hood is improved.The research content provides reference and practical application value for the research of automobile collision safety.