A methodology for optimizing the performance of vehicles in the leg impact portion of the EEVC WG17 pedestrian safety regulations has been presented. Three different simulation models of the leg impact test were used in this methodology: a detailed model of the vehicle front structure, simplified model of the vehicle front structure, and a response surface model which acted as a surrogate for the finite element simulations. Since the simulations with the original detailed finite element model of the vehicle front structure required several hours of computer time, it was necessaiy to create a simplified finite element model of the vehicle front structure that required much less computer time in order to carry out optimization studies. It has been demonstrated that the simplified model gives results similar to the detailed model when compared to test results. The parametric finite element model pre-processor LS-INGRID was used to automatically regenerate the simplified front structure model to reflect changes in design parameters that define the geometry and structural stiffness of the vehicle front structure. In this way the leg impact simulation with the simplified front structure mode could be incorporated into an automatic optimization strategy that optimized the design of the front structure. The optimization methodology presented in this study was an updated response surface technique. In this technique a series of leg impact simulations were performed with different front structure designs using the simplified front structure FE models. The results of these simulations were then used to generate a response surface function that gave the performance parameters as a function of the front structure design parameters. This response surface model was then used in combination with the additional leg impact simulations with the simplified FE model to optimize the design. As a demonstration of the proposed optimization methodology, design optimizations were carried out in order to improve the leg impact performance of an example vehicle. It was found that performance improvements could be achieved for this vehicle by including energy absorbing foam in the space between the bumper skin and steel bumper beam. Further performance improvement could be achieved by reducing the size of the bumper beam to create more crush space between the bumper skin and bumper beam that could be filled with energy absorbing foam. However, reducing the size of the bumper beam could have a negative impact on non-pedestrian related performance requirements that were not considered in this study. Strengthening the stiffener located below the bumper also improved performance, primarily by reducing bending of the leg impactor. Moving this stiffener forward so that it was flush with the front of the bumper skin resulted in even better performance.


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    Titel :

    Front structure design procedure for optimal pedestrian leg impact performance


    Weitere Titelangaben:

    Design der Fahrzeugvorderseite für ein optimales Verhalten bei einem Stoß gegen ein Fußgängerbein


    Beteiligte:
    Neal, Mark O. (Autor:in)


    Erscheinungsdatum :

    2004


    Format / Umfang :

    9 Seiten, 9 Bilder, 2 Tabellen, 15 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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