Research On The Structure Simulation And Multi-objective Optimization Of Vehicle Door

The vehicle door and other vehicle body components constitute the vehicle overall framework.It is the first passenger-vehicle interactive systems.The door body includes the inner and outer panels,reinforced plates and so on.It belongs to the category of the white body.As an important component of vehicle body,the stiffness,strength,crashworthiness performance of the door and the overall design of the vehicle are mainly depended on the door body.The phenomenon such as the door shaking,waggling,air-leaking and sinking are caused by the unreasonable design of vehicle door.This can not only impact the driving safety and the comfort,but also accelerate the destruction of the other components.So the optimal structure design of the vehicle door is becoming more and more important.The existing optimization of vehicle door is mainly focused on one or two performance,such as the modal,stiffness or the crashworthiness performance,which cannot improve the overall performance of the vehicle.Furthermore,due to the use of different softwares,the data transfer between softwares may cost a lot of labor and lead to a lower work efficiency.Based on the experimental test and computer simulation technology,the multi-objective optimization of the vehicle door was carried out with the ISIGHT platform in this paper.According to the abnormal vibration of a vehicle door,the finite element model of the vehicle door was established by the HYPERMESH software.Its nature frequencies,vertical stiffness and crashworthiness were calculated and compared with the results of modal test to verify the validity of the finite element model.Then the sensitivity analysis method was implemented to choose the sensitive components for the mass,vertical stiffness,first order frequency and the crashworthiness of the door.In order to improve the efficiency of optimizations,the RBF approximate model was established with the ISIGHT platform that combines NASTRAN and LSDYNA.Based on the model,the NSGA ? optimization method was implanted.The results showed that the engine resonance frequency was kept off,and the other optimization targets were also promoted.Present method and conclusion can provide a theoretical reference for the improvement of the door.At the same time,this paper provides a certain guidance for the development of similar vehicle design,and it is of actual application value.