Theses and dissertations

PhD thesis

Dispersion of vibrating structures behavior: analysis and detection

Advisor Jean-Louis Guyader - INSA Lyon
Defended on 18 dec. 2002

Jury members: P. Bouillard (ULB, Bruxelles), A. Combescure (INSA Lyon), J.-P. Coyette (UCL, Louvain-la-Neuve), J.-L. Guyader (INSA Lyon), M. Lemaire (IFMA, Clermont-Ferrand), M. Ochmann (TFH, Berlin), J. Perret-Liaudet (ECL, Lyon)

Abstract: This work deals with sensitivity phenomenon on vibrating structures. An alternative to classical methods used in sensitivity analysis is presented : the proposed method is a tool that allows one to know which part of a structure is responsible for dispersions, in order to be able, during a design phase, to modify zones inducing large sensitivities, or in a manufacturing phase, to take care of these zones. The first step of this work is to present hypersensitive phenomenon, which can be observed on semi-infinite coupled beams and plates. The analysis and characterization of these phenomenon are developed and compared with finite cases. Then, a method to localize main uncertainty causes of a given structure is presented, it is based on techniques used in finite element updating, and it is applied on an analytical example, and developed in order to be integrated in a finite element code, in order to test it on industrial structures allowing experimental validation of results.

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Habilitation à Diriger des Recherches

Decision-making methodologies for structural dynamics and vibroacoustics design

Defended at University of Franche-Comté on 30 nov. 2010

Jury members: N. Atalla (GAUS, Sherbrooke), L. Boubakar (UFC, Besançon), A. Chaigne (ENSTA, Palaiseau), W. Desmet (KUL, Leuven), J.-L. Guyader (INSA Lyon), G. Lallement (UFC, Besançon).

Abstract: This HDR constitutes an opportunity to present a summary of my research activities in structural dynamics and NVH. This manuscript is organized in four parts. The first part presents an overview of my activities to highlight quantitatively the elements related to teaching, research and community service tasks. The second part, which is the heart of memory, is more specifically devoted to the description of my research activities. These activities are presented in the form of three scientific themes (energy indicators for sensitivity analysis, reduced models for NVH and functional materials for energy dissipation), whose common goal is the development of methodologies to help in the design in structural dynamics and NVH. For each topic, the context, results and perspectives are presented. The third section provides a list of publications related to previous works. The last part consists of reproductions of a number of publications considered as essential to make exhaustive and synthetic the vision of the activities presented in the second part.

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