关键词: 发动机罩, Kriging模型, 多目标优化, 最优拉丁方法

Abstract:

In order to reduce the head injury criteria (HIC) of a car in collision process, this paper improved inner plate of engine hood by topological optimization method. Finite element models of head impact engine hood were established and the thicknesses of inner plate, outer plate, stiffener and hinge of improved engine hood plate were defined. Sample data were acquired by the Latin hypercube design of experimental method and simulated in LS-DYNA and OPTISTRUCT. Kriging approximate models of HIC, modal and mass were built and NSGA-Ⅱ(Non-inferior layered genetic algorithm) was applied to search the global optimal design. Finally, the simulation results indicate that adult head-form HIC value drops by 45.13%, the mass is decreased by 7.95% and the vibration prevention is improved.

Key words: engine hood, Kriging model, multi-objective optimization, optimal Latin hypercube