Research On Lightweight And Crash Safety Of Electric Car Hood Based On HyperWorks

With the improvement of energy conservation and emission reduction awareness, Electric cars have been the general means of transport among the daily life of people. In order to improving the bearing capacity and mileage of electric cars,electric cars lightweight are becoming more and more important. In many electric car parts, Lightweight design of electric car hood can not only achieve the goal of lightweight, but also relate the safety of pedestrians collision,So the researching of electric car hood lightweight is particularly important. Lightweight design of electric car hood, both can improve the mileage of electric cars and achieve the goal of energy conservation and emissions reduction.In this paper, a 3D model of the hood of the electric car offered by the company is referred to. The model is simplified by the UG NX 8.5 software,and then imported into the HyperWorks 11.0 to generate the finite element model., Through carry on the forward bending condition, lateral bending condition, torsion condition,sinking-resistance condition, constraint modal condition, free modal condition’s analysis, The result shows that electric car hood conform with structural strength and modal’s requirements, and can carry on the lightweight design; The electric car hood area are divided, then be crashed analysis, The simulation results shows that the electric car hood needs to be optimized to reduce the HIC value. So that, The electric car hood can be carry on the lightweight design.Firstly, the light weighted design of the structure of the front hood is performed by referring to the results of the static case analysis, modal analysis, and crashworthiness. To realize the goal of minimizing the flexibility and maximizing the natural frequency, the Multi - objective topology optimization design of the hood of the electric car is performed through using compromise programming method and analytic hierarchy process, after the verification and analysis of the static condition,modal condition, and collision safety, on the premise of meet the requirements, the electric car inner hood in weight lossed of 7.2 %, The head injuries value of collision zone decreased.Then, after the electric car inner hood structure optimization design are completed, To realize the goal of minimizing the flexibility and maximizing the natural frequency,the Multi - objective size optimization design of front hatch hinge,hinge support, hinge reinforcement plate, and latch reinforcement plate is realized by utilizing adaptive response surface method., after the verification and analysis, on the premise of meet the requirements, the electric car hood in weight lossed of 10.5 %,The head injuries value of collision meet national standards.Finally, after the electric car hood lightweight design completed, according to the actual situation, the electric car hood are replaced by lightweight materials. the every parts of electric car hood material attribute weights be needed sure using house of quality method, the every parts of electric car hood are selected by lightweight materials using fuzzy VIKOR method. After the verification, the electric car hood in weight lossed of 30.4 %, The head injuries value of collision area decreased further.