Uncertainties in structural dynamics: overview and comparative analysis of methods

Sami Daouk (1) , François Louf (1) , Olivier Dorival (2) , Laurent Champaney (1) , Sylvie Audebert (3)

1 LMT - Laboratoire de Mécanique et Technologie
2 ICA - Institut Clément Ader
3 EDF R&D AMA - Analyses Mécaniques et Acoustiques

When studying mechanical systems, engineers usually consider that mathematical models and structural parameters are deterministic. However, experimental results show that these elements are uncertain in most cases, due to natural variability or lack of knowledge. Therefore, engineers are becoming more and more interested in uncertainty quantification. In order to improve the predictability and robustness of numerical models, a variety of methods and techniques have been developed. In this work we propose to review the main probabilistic approaches used to model and propagate uncertainties in structural mechanics. Then we present the Lack-Of-Knowledge theory that was recently developed to take into account all sources of uncertainties. Finally , a comparative analysis of different parametric probabilistic methods and the Lack-Of-Knowledge theory in terms of accuracy and computation time provides useful information on modeling and propagating uncertainties in structural dynamics.

Mots clés: parametric uncertainty; uncertainty propagation; structural dynamics; model reduction; lack of knowledge

Domaines: Mécanique [physics]

Sami Daouk, François Louf, Olivier Dorival, Laurent Champaney, Sylvie Audebert. Uncertainties in structural dynamics: overview and comparative analysis of methods. Mechanics & Industry, 2015, 16 (4), pp.10. ⟨10.1051/meca/2015010⟩. ⟨hal-01183149⟩