In this paper a modeling strategy for damping and absorption was presented that is based on computational optimization and model updating techniques. For the structural part, individual structural damping is assigned to the individual components and subsequently updated utilizing frequency response test data obtained from classical modal analysis testing (force excitation). For the acoustic absorption the approach is extended such that individual absorption coefficients can be addressed. The test data utilized here come from acoustic tests with volume source excitation. For both, structural damping and absorption, promising results could be obtained for a car body in white. Especially the comparison with simulated data from Finite Element analyses proved a good qualitative and quantitative agreement. Furthermore the results for the absorption were backed up by different identification techniques (Kundts tube and Microflown device) and exhibited a good robustness of the simulation results with respect to insecurity in the absorption values. This increases the confidence in the results obtained from the simulation utilizing the proposed absorption modeling technique. The main appeal of the presented strategy is that it can be easily implemented utilizing standard Finite Element codes, and that a read-across to altered assemblies is feasible without difficulty. Furthermore starting values for damping and absorption can be taken from a priori knowledge and/or dedicated identification techniques. Thus it can already be applied at a time when no hardware is yet available.


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    Titel :

    Computational model updating of structural damping and acoustic absorption for coupled fluid-structure-analyses of passenger cars


    Beteiligte:
    Schedlinski, C. (Autor:in) / Wagner, F. (Autor:in) / Bohnert, K. (Autor:in) / Küsel, M. (Autor:in) / Clasen, D. (Autor:in) / Stein, C. (Autor:in) / Glandier, C. (Autor:in) / Kaufmann, M. (Autor:in) / Tijs, E. (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    16 Seiten, 17 Bilder, 9 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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    Mitchell,C.G. / Dunn,W.H. / Austin Rover Group,GB | Kraftfahrwesen | 1990