Mesure sans contact d'un panneau d'aile d'avion et analyse numérique pour contrôle dimensionnel

Content Provider	Semantic Scholar
Author	Sok, Michel Christian
Copyright Year	2013
Abstract	RESUME Lors de la fabrication des panneaux d'ailes d'avions, les etapes d'inspection sont primordiales pour assurer leur conformite et donc permettre aux ailes d'assurer les performances aerodynamiques requises. Aujourd'hui cette inspection se fait de facon manuelle a l'aide d'une jauge et d'un gabarit d'inspection pour le panneau, etant donne sa faible rigidite qui empeche les methodes d'inspection traditionnelles. Iterativement, tant que la geometrie du panneau n'est pas jugee conforme, il repasse par une etape de mise en forme avant d'etre inspecte a nouveau. Non seulement le gabarit est un element extremement couteux car precis, mais ce genre d'operation consomme du temps en monopolisant le gabarit qui ne peut donc pas etre utilise pour un autre panneau. En partant de cette constatation, ce projet vise a fournir une reponse quant a la faisabilite d'une methodologie basee sur l'automatisation de ce type d'operation. Ceci en integrant dans le processus des machines de mesure sans contact capables d'acquerir numeriquement la forme geometrique du panneau. De plus, la possibilite de realiser cette operation sans l'utilisation de gabarit est aussi a l'etude, ce qui le laisserait libre pour d'autres tâches. La methodologie proposee utilise des simulations numeriques afin de verifier la conformite du panneau. Cela permettrait alors de passer a une inspection semi-automatisee et sans gabarit en fournissant un outil d'aide a l'operateur. La methodologie proposee peut etre decrite en trois etapes cependant, il est necessaire de proposer une etape supplementaire afin de valider les resultats obtenus avec cette methodologie. C'est le role de la premiere etape qui consiste a acquerir manuellement des valeurs de references qui serviront a etre comparees avec les valeurs obtenues lors de l'application de la methodologie. La deuxieme etape est l'acquisition numerique de l'objet a inspecter pose sur un plateau support quelconque, a l'aide d'un scanneur laser.-ABSTRACT During the manufacturing of the wing skin, the inspection steps are essential to ensure their conformity and thus allow the wings to ensure the required aerodynamic performances. Nowadays, considering the panel's low stiffness which prevents traditional inspection methods, this inspection is done manually with a template gauge and a jig. Iteratively, as long as form compliance is not reached, the panel goes through an additional dimensional refinement before being inspected in a second time. Because the jig is accurate, it is very expensive and furthermore, the inspection of panels is time-consuming by monopolizing the jig, which cannot be used in the meantime. Using this consideration as a starting point, this project seeks to provide a response to the practicability of a methodology based on the automation of that king of operation. This by integrating into the process non-contact measuring machines capable of acquiring numerically the geometrical shape of the panel. Moreover, the opportunity of realizing this operation without the use of a jig is also being considered, which would leave it free for other tasks. The methodology suggested use numerical simulations to check form compliance. Finally, this would provide a tool to assist the operator by allowing a semi automated inspection without jig. The methodology suggested can be describe in three steps, however it is necessary to propose an additional step to validate the results achieved with this methodology. Then, the first step consist of manually acquiring reference values which will served to be compared with the values obtained during the application of the methodology. The second step deals with the numerical acquisition, with a laser scanner, of the object to be inspected settled down on some supporting plate. The third step is the numerical reconstruction of this object with a computer-aided design software. Finally the last step consists of a numerical inspection of the object to predict the form compliance. Considering the large dimensions of the wing skins and of the jigs used in industry,the methodology suggested takes accounts of the available means in laboratory. Then, the objects used have lower dimensions than those used in the industry.
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Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article