Multidisziplinäre numerische Parameter- und Shapeoptimierung von Karosseriebauteilen am Anwendungsbeispiel Fußgängerschutz

H. Bachem, D. Schwarz, J. Bordasch (IKA Aachen) For the realisation of light weight design during the development of new constructions in the automotive industry an increasing usage of numerical optimisation tools that are based on Finite Element Methods (FEM) takes place. During the application of the programs statical and dynamical loads are applied on the basic model and this is optimised with respect to different target functions (e.g. maximum stiffness and minimum weight). A special efficiency of the optimisation tools is reached if the system response is dependent on a multitude of parameters, which is mostly the case in the field of crash simulation. In this study a methodology for a purposeful optimisation of vehicle structures with respect to the impact of subsystems from the European directive for pedestrian safety is presented based on examples for different impact scenarios. Apart from a pure parametric optimisation the implemented morphing functionality allows complex geometric variations of the finite element mesh during the optimisation process. In the presented examples the objective refers directly to the Head Injury Criterion.