In this paper, the Modal Stability Procedure (MSP) has been proposed for predicting the effect of uncertainties on the vibration behavior of complex structures, in the framework of linear structural dynamics. The uncertain input parameters are: Young moduli, thicknesses and densities. The method, which is based on the assumption of modal stability, includes two stages. The first stage consists in only one finite element calculation in the nominal configuration. Abaqus is used for this analysis, however, the MSP is compatible with any standard finite element software. Modal element strains and mode shapes are then extracted from this nominal analysis. These output data are exploited in the second stage, which consists in carrying out a fast MCS. Thanks to the modal stability assumption, the MSP is drastically accelerated, compared to the direct MCS. The method has been tested on two examples: spot welded plates and a car body-in-white. Statistical quantities associated with eigenfrequencies and FRFs (mean value, standard deviation, coefficient of variation, density of probability, confidence intervals) have been calculated and analyzed. Confrontations between the MSP and the direct MCS have been carried out. For the two examples, the MSP has shown to be accurate, providing results in good correlation with the direct MCS. Moreover the computational time gain is very high. Depending on the example and the number of trials, the ratio of computational time between the MCS and the MSP may reach several hundreds or even one thousand. So the MSP is an efficient and economic approach.


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    Titel :

    Uncertain vibration analysis of an automotive car body modeled by finite elements with the Modal Stability Procedure


    Beteiligte:
    Boubaker, M.B. (Autor:in) / Druesne, F. (Autor:in) / Lardeur, P. (Autor:in) / Barillon, F. (Autor:in) / Mordillat, P. (Autor:in)


    Erscheinungsdatum :

    2012


    Format / Umfang :

    13 Seiten, 15 Bilder, 8 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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