Abstract
Serious injured parts of pedestrian include head, chest and legs, when hit by an automobile frontal collision. Lower absorber equipped under the front bumper is one of the effective devices for the suppression of serious leg damage. In this paper, it is proposed more effective device called active lower absorber, which moves just before or shortly after the impact to suppress knee injury without the increase of other criteria values by adjusting the design parameters of timing of activation and the absorber motion. The response surfaces of four injury criteria of multi-objective design problem are constructed based on the crash analysis by LS-Dyna and design of experiment. The Pareto-optimum solutions are found by the ε-constraint method, and categorized by the self organized mapping method(SOM).
