The Lightweight Of New Energy Vehicles Front Stringer Based On Crash And TB New Materials

With the deepening of energy crisis and environmental crisis,development of automobile industry has received a great impact.In our country,in order to meet the need of times development in 2001,the new energy vehicles research projects will be listed in the state "15" during the "863" major project of science and technology.There has the very big difference between new energy vehicles and the traditional gasoline car because of its body structure and working principle,also put forward new requirements for vehicle collision safety.On the other hand,new energy vehicles have more pressing needs to increase driving mileage and energy conservation and emissions reduction.Lightweight car body as a hot research topic in today's automotive industry for energy conservation and emissions reduction of the vehicle has important significance.How to ensure the safety of new energy vehicles collision under the premise of realize the lightweight is contemporary and scientific research of new energy vehicles need to key research topic.Auto front stringer as a kind of sheet metal parts is the main vehicle frontal impact energy absorption components also provide support for the carrying of parts of front cabin,the strength,deformation and deformation of collision speed not only determine the bridge deformation degree and affect the safety of parts of front.Especially some new energy pure electric cars will be power battery is decorated in the engine room,once the vehicle frontal crash,if the vehicle front stringer cannot provide adequate protection for front power battery,power battery has been bumped extrusion deformation even the risk of spontaneous combustion or explosion.So on new energy pure electric car front stringer lightweighting design not only should consider the front stringer energy absorption performance to protect the safety of passengers,but also to the strength of the front stringer protection front power battery,in order to prevent spontaneous combustion power battery before and after the collision risk.First of all,based on the new energy automobile cabin layout the power electric battery characteristics of vehicle front stringer CAD model is established by using CATIA software,then introduce the non-uniform welding plate(TB)this kind of new production technology of new materials,the original front stringer subsection welding sheet metal simplified into owned by a piece of 3 period of different thickness and material composition of TB board,then put the CAD model import into HYPERWORK software before processing,a simplified finite element model of the front stringer frontal impact.Finite element model is established in the process of geometry in the process of cleaning,meshing,the material,the contact is defined,the hourglass control,time step control and integral algorithm and other issues discussed in-depth,and generate the ls-dyna finite element calculation of the available K file.Then,to determine the new energy automobile front stringer optimization optimization problem,the quality of car's front stringer with the optimization target of the lightest with TB board three different positions of thickness and material yield strength as design variables,longitudinal beam is touch the front stringer before the middle of the deformation and the longitudinal beam in the back of the acceleration peak value as constraint conditions,and through the Latin super 16 of legislative sampling experiments design sample points,after solving the application of polynomial response surface method and Kriging method for function approximation fitting response m,a,L.Finally,by using the genetic algorithm to optimize a design variable and the response function,and finite element simulation to verify the optimization results again.Through optimization,front stringer quality was reduced by 12.5%,but the front stringer middle new energy vehicle power battery and arrangement of deformation is reduced,and energy absorption effect has improved significantly.The research shows that the introduction of the TB plate can be a very good,and solve the front stringer properties and structural strength;HYPERWORKS and association of ls-dyna finite element simulation to the study of vehicle frontal crash has certain practical value;Genetic algorithm is the intelligent optimization algorithm can provide very good solve some complex engineering optimization problems.