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Tolérancement Modal : De la Métrologie vers les Spécifications

Abstract : The product definition uses an established language between every actors of the product life cycle : designer, producer and metrologist. It can be a common language, such as the ISO standard, or specific one. It allows to define dimensions, tolerances and any kind of geometrical errors : form, position and orientation. The production of parts is never to be perfect, therefore it is necessary to reach a compromise between the designer requirements and the manufacturing processes. Morevoer, controlling the acceptable variations of the real geometry around the target remains a major issue of geometrical tolerancing. Many existing models aiming at defining those variations but appear to be insufficient to characterize the form error. The objective of the presented work is to define a new form parameterization from which a model of form tolerancing is built. Resulting from vibratory mechanics and namely called "modal parameterization", it models a geometrical element in a geometrical form space. First, the modal parameterization is used to visualize the geometrical errors of surfaces and to characterize those surfaces using tailor-made metrology, this latter approach is called Modal Metrology of Surfaces (MemoSurf®). Beyond visualization, the metrology is also a checking stage of the geometrical specifications. As a consequence, in the second approach, an assembly method allowing to assess the accuracy of an assembly exhibiting form errors. The applicability of the presented tolerancing model is related to a proper statement of the functional requirements. Finally, the last part of this document proposes to define a specification language throughout the modal parameterization framework. In order to assess the acceptable variations of the modal parameters, two industrial exemples are presented : the first is concerning a process control and the second, a requirement specification.
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Submitted on : Wednesday, November 18, 2009 - 12:10:29 PM
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Hugues Favreliere. Tolérancement Modal : De la Métrologie vers les Spécifications. Mécanique [physics.med-ph]. Université de Savoie, 2009. Français. ⟨tel-00426927⟩

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