Intégration du comportement thermomécanique des pièces dans l'analyse des spécifications géométriques : application à une turbine de moteur d'hélicoptère

Abstract : The performance of a helicopter engine is strongly correlated to the performance of the high pressure turbine, and particularly to the influence of the different components. The energy efficiency of a high pressure turbine is guaranteed by controlling the clearance between the top of the blades and the stator during the operating cycle of the turbine. The objective of this work is to propose a multi-physics approach based on operations on polytopes (Minkowski sum and intersection) to validate the geometric specifications, contact specifications and thermomechanical specifications. These specifications ensure a limit of the leakage section at the top of the blades for a minimal touch risk. A polytope simulates the geometric variations between two surfaces of the same part; moreover a contact polytope simulates the geometric variations between two surfaces potentially in contact. The topological structure of the contacts within the turbine is formalized by a connected graph. This structure helps to define the Minkowski sums and intersections of polytopes resulting from the propagation of the geometric deviations through the turbine. The geometric deviations induced by the thermomechanical strains are estimated by the finite element method. These works give elements of decision to the designer on the influence of design choices, especially the influence of part shapes and of behaviour of joints, on the operation of the turbine.
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Submitted on : Thursday, May 19, 2011 - 3:27:46 PM
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Laurent Pierre. Intégration du comportement thermomécanique des pièces dans l'analyse des spécifications géométriques : application à une turbine de moteur d'hélicoptère. Mécanique [physics.med-ph]. Arts et Métiers ParisTech, 2011. Français. ⟨NNT : 2011ENAM0008⟩. ⟨pastel-00594317⟩

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