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Penaud, Julie (2011)
Languages: French
Types: Article
Subjects: Automatique, Traitement du signal, Cinématique, 621
L'hélicoptère est un moyen de transport et de secours en plein développement. Cependant, les coûts d'entretien et de maintenance de ces appareils freinent à l'heure actuelle son développement. Au-delà de la restriction des coûts de maintenance, la sécurité des passagers ou des secouristes à bord est en jeu. Dans ce contexte, cette thèse a pour objectif de développer une méthode de diagnostic de la chaine de transmission d'un hélicoptère. Il a été choisi de concentrer les travaux de cette thèse sur la Boite de Transmission Principale (BTP). En effet, ne présentant aucune redondance dans l'appareil et étant fréquemment une source d'accidents, elle représente le point faible de la transmission d'un hélicoptère. Pour développer cette méthode, une étude des méthodes de traitement des signaux vibratoires a été réalisée. Elle a mené au développement d'une approche à base de modèle cinématique et de filtres de Kalman pour le diagnostic de la BTP d'un hélicoptère. Un banc d'essai a été mis en place afin de tester expérimentalement cette approche. The helicopter is a mean of transportation and of rescue constantly developing. However, the costs of maintenance of those crafts are currently limiting its development. Moreover, the safety of the passengers and rescuers on board is at stake. In that context, the aim of this PhD study is to develop a method of diagnosis of the transmission of the helicopter. We have chosen to focus on the Main Gear Box (MGB). Actually, this part is not redundant in the craft and is quite often responsible for crashes : it represents the weakest link of the helicopter transmission. So as to develop this method, different methods of signal processing have been studied. It led to the development of an approach based on kinematic modeling and Kalman filtering for the diagnosis of the MGB. A test bench has been created so as to test this approach.
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