Current airbag models are required to be readily available, generally applicable, and suitable for prognosis. This requirement has become particularly significant in hardware-free development phases. Therefrom results the requirement of ensuring the use of state-of-the-art methodological approaches. In addition, it must also be possible to ensure a quantitative evaluation of an airbag model's quality. To adequately meet this requirement, the German Association of the Automotive Industry (VDA) has defined a standardized modeling guideline for the design of airbag models. Creating a model along this guideline may appear to involve greater expenditure at first. On the other hand, the use of synergy effects in form of reduced model variety and uniform requirements on the part of the OEMs compensates for this extra expenditure. This project required the detailed examination and evaluation of numerous individual aspects related to the model creation. For the simulation, this includes in particular consideration of the fabric compressive and flexural strength, as well as the process-oriented folding speed for the correct representation of the folding pattern; also included are the strain rate-dependent modeling of the airbag cover rip-open line to characterize the opening behavior, and further aspects regarding the adequate test bed modeling. Moreover, the tests required careful handling of the significant test variance exhibited during the pendulum configuration (6) (deployment against the pendulum) and the OOP substitute test. In addition to the test variance, all pendulum configurations showed a pendulum oscillation overlaying the acceleration signal. These pendulum oscillations impair the CORA evaluation. The individual phases and amplitudes of these oscillations are not represented by the simulation. Therefore, the CORA evaluation, which is to 70% dependent on the consistency of acceleration signals, is not able to reach the required 90% for the configurations (2) through(5), as is required for all load cases. In contrast, the evaluations of the additionally measured oscillation-free travel measurements lie well above 90%. The resulting recommendation is to use low-oscillation test beds to validate airbag systems. Such irregularities must be represented on the basis of a consistent model validation documentation; only then are they acceptable. As of the date of publication, the work on the adequate representation of the deployment configuration against the pendulum (6) has not been concluded.


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    Titel :

    Application of standardised modelling guidelines for airbag simulation models


    Beteiligte:
    Dörnhoff, Holger (Autor:in) / Hirth, Andreas (Autor:in) / Remensperger, Rolf (Autor:in) / Ruckdeschel, Doris (Autor:in) / Specht, Bodo (Autor:in) / Weber, Susanne (Autor:in)


    Erscheinungsdatum :

    2012


    Format / Umfang :

    19 Seiten, 18 Bilder, 1 Tabelle, 4 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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