A Structure Optimization Of Vehicle Front Absorption Beam

The energy beam in front of the car is an important component for the body collision energy absorption system,which is closely related to the safety of the occupants and the surrounding pedestrians.This paper focuses on optimization of beam lightweight and its structure.The content is as follows.First,the function requirements of the front energy beam of the car is introduced.The structure of the body energy absorption system is expounded,and the basic principle of collision energy and the evaluation standard of energy absorption characteristics are analyzed.Additionally,the collision performance requirements of the front energy absorbing beam are analyzed,and the structural optimization design points and boundary conditions are obtained.Second,taking the collision performance of the front energy beam of a prototype car as the reference,the optimal design of the energy beam of the car is carried out under the premise of maintaining the collision performance while minimizing the weight.The technical strategy of replacing the steel with the aluminum is determined,The selected material of the energy beam is 6351-T6 aluminum alloy,the material of the energy absorbing box is 6063-T4 aluminum alloy.The cross-sectional shape and wall thickness of the front energy absorbing beam and the energy absorbing box are optimized,it is determined that the front cross section is adopted with the front energy absorbing beam,and the combination of the hexagonal cross-sectional shape is the best.Besides,the connection way between the front crash/anti-collision beam and the body is also optimized.Then,the CAE simulation and physical test are used to verify the performance of the front passenger beam of the car under the condition of repairable collision,column collision,40% rigid wall collision and 40% deformable barrier collision.The results show that the crashworthiness performance of aluminum front energy beam can meet the design requirements,and the weight of the front anti-collision beam has reduced by 35%,and the purchasing cost of this component has reduced by 165 yuan compared with the prototype car.Finally,by applying the aluminum anti-collision beam as a modular component to the PF2 platform,the modular technology strategy for the anti-collision beam of the PF2 platform car is established,and thus reducing the manufacturing costs and enhancing the production efficiency.The research results of this paper are of great significance to the design of the lightweight and collision safety of the front energy beam of the car.