| This paper is based on the domestic cars, using the method of combining Theoreticalanalysis and simulation technology and experiment, to research the dynamic responsecharacteristics in the low-speed collision of the bumper system. At the same time, putforward the structure improvement methods. The main contents of this paper as follows:First，derived for bumper beam deformation response of expression under the rigidbody collision by using kinetic methods of analysis.second，Establish a bumper system geometric model and finite element modal, inlow-speed numerical simulation frontal collision and40%offset collision of bumpersystem by LS-DYNA software. The dynamic response characteristics of the originalbumper system, focused on analyzing the bumper system deformation process, thestress-strain changes, displacement changes, the absorption of energy and the accelerationof the trolley. Discovered from these changes of the characteristic parameters, the originalbumper system structure stiffness is too large, is not conducive to the energy absorption,thereby increasing the likelihood of occupant injury.Third，determine the structure using topology optimization design and structureimproved methods. The topology optimization method to design a new bumper beams,energy absorbing bracket comparative analysis by enumeration method. Then combine theforming process to determine the structure of the new bumper system.Fourth, the comparative analysis of simulation and experiment. through trolleycollision simulation to study the dynamic response characteristics of the new bumpersystem, concluded that new bumper system energy absorption is large and energyabsorption characteristics are better. By low speed frontal crash and40%offset crashexperiment, analyze dynamic response characteristics of the new bumper system, and toverify the consistency of the simulation results and experimental results. At the same time,prove the correctness of the simulation model. |
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