Crashworthiness Analysis And Optimization Of Aluminum Body Electric Vehicle In Front Impact

In the context of environmental pollution and energy shortage,the development and use of new energy vehicles has become a hot research topic in the major automotive companies.Compared with traditional vehicles,electric vehicles have more stringent safety requirements in the collision safety.A new all aluminum body electric vehicle is taken as the research object,and the frontal crash safety of the model is studied.The 3D model of aluminum electric vehicle is established by CATIA.Based on C-NCAP,the finite element analysis model of 100% rigid barrier and 40% offset collision is established by ANSA.The Ls-dyna software is used to calculate the finite element model,and the collision characteristics of the whole aluminum body electric vehicle are obtained.The variation law of energy,velocity,B-column acceleration and door-frame deformation during the collision process of all-aluminum electric vehicle is analyzed.The shortcomings of the main energy-absorbing components such as front collision beam,energy-absorbing box and longitudinal beam are analyzed.Aiming the problems existing in the frontal collision,the adaptive response surface method is introduced to optimize the main energy absorption structure in the front of the vehicle body.By optimizing the response surface function,the optimum results of the thickness of the front plate,the thickness of the front plate reinforcement plate,the thickness of the upper end of the A column,the thickness of the lower column of the A column,the thickness of the column and the thickness of the beam are obtained.According to the transmission path of the collision force during the frontal collision of the aluminum car,the structure of the front collision structure,the size of the energy tank and the structure of the A column are adjusted to improve the stiffness of the structure and reduce the amount of the front hull intrusion.The DOE test scheme is designed for the acceleration of the vehicle body and the deformation of the door exceeding the target value.The four-factor,3-level L9(34)orthogonal test is used to evaluate the intuitive,variance and significance.Then the best test program is obtained.Compared with the basic model,the final result of the optimization reduces the acceleration peak and the intrusion capacity of the passenger compartment,so that the safety of the vehicle front collision is improved,which provides the basis for the safety design and improvement of the frontal collision of the aluminum electric vehicle.