In automotive industry, design decisions are increasingly based on virtual prototypes, such as numerical Finite Element (FE) models. This reduces the need for expensive physical prototypes, so that design cost and time-to-market can be reduced. These FE models are deterministic, implicitly assuming that all design parameters are precisely known and that the manufacturing process produces identical structures. This is typically not valid. Uncertainty exists in the manufacturing process, in the physical and geometrical properties and in the environmental conditions. A single deterministic analysis is not sufficient to fully understand their effect on the structural and vibro-acoustic performance. Including possibilistic models of design variables into the mechanical simulation process can lead to an improved design process so as to guarantee the robustness of the design with a fuzzy approach. In this paper, the benefits of this approach are demonstrated on an industrial windshield structure. Measurements of the dynamic response of the windshield have been collected in free-free conditions for nominally identical windshields at different temperatures. A validated FE model in the frequency range of interest has been used. Uncertainty in its physical and geometrical parameters has been obtained from test data and has been introduced in the numerical model in order to assess the effects on the dynamic response. The outcome of the analysis consists of a possibilistic model of the frequency response function, given the the uncertainty in the input parameters. This analysis not only provides a better insight into the effects of uncertainty in the dynamic response prediction, but also provides sensitivity measures of the design parameters on the final performance of the structure. In addition, guidelines to further improve structural designs and manufacturing processes are also obtained.
Modelling of a vehicle windshield with realistic uncertainty
Modellierung einer Fahrzeug-Windschutzscheibe mit realistischer Unsicherheit
2006
10 Seiten, 9 Bilder, 2 Tabellen, 18 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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