Vibro-Acoustic analysis of structures with geometric shape uncertainty
| Autor: | Verhaeghe, W., Rousounelos, A., Desmet, W., Vandepitte, D., David Moens |
|---|---|
| Přispěvatelé: | De Roeck, Guido, Degrande, Geert, Lombaert, Geert, Müller, Gerhard |
| Zdroj: | ResearcherID Scopus-Elsevier |
| Popis: | In recent years many methods were developped to deal with scalar parameter uncertainties in a non-probabilistic way. This approach covers a large part of the uncertainty problems in engineering, but a blind-spot remains for uncertainties that give rise to a spatially distributed influence. The focus of this work is on dealing with such uncertainty fields that have a spatially distributed influence, namely geometrical uncertainties. The authors have developed an interval field framework to deal with multiple dependent uncertainties. In this framework a set of constant base vectors describes the dependency. Every vector of the set has an associated interval factor, that scales it. In this way the uncertainty space is drastically reduced from independent uncertainty about every component of the field, into uncertainty about the value of a limited number of well chosen interval factors. Crucial in the application of such an approach is the definiton of the input interval field. For defining geometric uncertainties this definition phase must be as generic as possible. Combining mesh-deformation methods with the developped interval field framework allows such versatility. Once the input uncertainty is formulated, the methods developed for dealing with scalar parameter uncertainties (in this case the interval parameter scaling the base vectors of the field) are applied to find the requested output. The methodology is successfully applied to a finite element trimmed car model. A variety of geometric uncertainties on the input side is handled. The method is especially suited for uncertainty in the design parameters in an early development stage of a project, where for instance the FE model of the previous design is available and changes to body panels are considered. Relevant dynamic output results (eigenfrequencies and sound pressure levels) are studied. ispartof: pages:3024-3029 ispartof: Proceedings of the 8th international conference on structural dynamics, Eurodyn 2011 pages:3024-3029 ispartof: International Conference on Structural Dynamics (EURODYN ) location:Leuven, Belgium date:4 Jul - 6 Jul 2011 status: published |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|