Digital Simulation And Optimization Of Car Crashworthiness

In recent years, traffic accidents are more frequent with amount of automobileincrease.People pay more and more attention to the research of vehiclecrashworthiness. Designing for car crashworthiness as the important component ofvehicle passive safety technology, is attached more and more importance byenterprises. Further studying on vehicle crashworthiness help to improve vehiclesafety performance of auto industry.In this paper, vehicle front collision was analyzed on a certain domestic car, andoptimizing design its crashworthiness, eventually improved the crashworthiness of thecar. The concrete content is as follows:(1) According to the enterprise standard of mesh generation,the vehicle modelhas been meshed by finite element software of Hypermesh,and a detailed full vehiclefinite element model was established based on crash regulations. The model wasanalyzed using software of LS-DYNA, and obtaining the results of collision.(2)The distortion of main energy absorption device of car was analyzed, andreinforced the the front anti-collision beam and the front longitudinal beam baseddeformation of the car. The simulation results show that peak acceleration of B-pillarconsistent with the original structure, and peak acceleration have not risen for strongerstructure. At the same time,and the deformation of front wall decreases. This showsthat the structural improvements plan is successful.(3) a finite element submodel of a car, which can replace the situation ofhead-on, was established. The model includes left energy-absorbing box, part of frontanticollision beam and left longitudinal beam. The veracity of submodel has beenvalidated by contrasting the result between original model and submodel.(4)The new double corrugated pipe style of energy-absorbing box be designedbased on the idea of extending energy absorption area and on the energy absorbingproperties of corrugated pipe. Its structure contain two parts of large bellows andsmall bellows, the thickness and strength of large bellows is better than the smallbellows. Plunging the endergonic box structure to the submodel, the optimal thicknessof new endergonic box was obtained by using optimization design.(5)Take the new endergonic box into the original car, the simulation result ofhead-on collision was obtained. Compared with original endergonic box, the absorbed energy of new endergonic box increases by14.2%, the peak acceleration of B-pillardrop of5%, the deformation of front wall has reduced by7mm, All of these resultsshow the feasibility of new endergonic structure.At the same time, In the case ofnon-longitudinal deformation of crushing, the energy absorption of new endergonicbox consistent with the original car in the40%frontal crash. That situation furtherillustrates the reliability of new energy absorption box.Generally speaking, the peak acceleration of B-pillar of the car falls55g to44.2g,the deformation of front wall falls142mm to115mm,this illustrates the correctness ofdesign method of this paper,and offers a new method of design of car’s energy-absorbing structure...