A development of hood optimization method with simultaneous consideration of pedestrian headform impact and stiffness performance

Paper #:
  • 2017-01-1449

Published:
  • 2017-03-28
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Abstract:
To comply with the regulations of pedestrian safety, particularly the head impact requirements, the geometry of the hood panel is significant. The objective of this research was to develop a standardized automated method to design a hood which meets the pedestrian headform impact safety regulations and additionally the stiffness and fatigue requirements. The developed method was performed in two steps. In the first step, a topometry optimization with Genesis/ESL(Equivalent Static Load) for the design of the supporting structure of an engine hood has been performed. The result was a preliminary CAD design of the inner hood. Since the objectives and constraints have to be defined for the linear optimization in the ESL method, alternative criteria need to be established for nonlinear responses like HIC values. Another challenging task is the translation of the nonlinear LS-DYNA model to a linear Genesis model. The interpretation of the result of the topometry optimization was a design with improved HIC values for four load cases for the steel hood, and for seven load cases for the aluminum hood, respectively. In the second step, a shape optimization has been performed with LS-OPT, ANSA and LS-DYNA to refine the functional requirements of the model. The mass as well as six HIC values could be further improved. The constraints defined for torsion, bending and the hood closing analysis were not critical. In total, 10 HIC values could be improved for the steel hood, and 13 HIC values for the aluminum hood, respectively.
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