Vehicle Front Structure Energy Absorbing Optimization in FrontalImpact

摘要

Energy absorption performance is one of the most important indexes in the vehicle safety during impact.Research on the car frontal structure energy performance and structure optimization was conducted in this paper. Wholevehicle model was established by HyperMesh and simulated in LS-DYNA. Simulation results indicated that modificationwas need for the original structure to meet requirement. Based on simplified whole vehicle model, orthogonal designoptimization was implemented, including bumper cross beam material (A), bumper cross beam thickness (B), energyabsorber groove distance (C), and front longitudinal beam groove number (D), with 3 levels for each factor. The bestoption was B3D1A3C3 was gained by using range analysis and integrated balance method. Simulation results showed thatboth front and total energy absorption were improved. The optimized structure increased front energy absorption to51.1%, which can meet the industry requirement.