Simulation de l'interaction rotor/stator pour des turbo-machines aéronautiques en configuration non-accidentelle

Abstract : Designers have long time worked for a better efficiency of aircraft engines and one of the main challenges lies in minimizing the clearance between the rotating and stationary parts. This technology directly affects the vibratory response of aircraft engines and consequently contributes to the ignition of contacts between the blades tips and surrounding casings. If contact occurs on several simultaneous locations over the casing, specific phenomena may occur such as modal interaction. This study focuses on detecting this potentially dangerous phenomenon in an industrial framework. Because of the large number of degrees of freedom, component mode synthesis methods are considered: a fixed-interface one – namely the Craig-Bampton method – and a free-interface one – namely the Craig-Martinez method. The use of these methods in a contact framework is investigated. First, modal interaction phenomena are explored with simplified 2D models, analyzing the influence of kinematic restrictions on its detection. Then, 3D industrial models are used for which the "true" solution cannot be performed. Contact treatment involves bicubic uniform B-spline surfaces for a better numericla behavior of the solution algorithm. Results obtained with both Craig-Bampton and Craig-Martinez methods are compared in order to evaluate the most appropriate method for industrial applications such as the one presented in the appendices of the thesis.
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Contributor : Alain Batailly <>
Submitted on : Wednesday, March 4, 2009 - 3:42:50 PM
Last modification on : Monday, March 25, 2019 - 4:24:08 PM
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Alain Batailly. Simulation de l'interaction rotor/stator pour des turbo-machines aéronautiques en configuration non-accidentelle. Sciences de l'ingénieur [physics]. Ecole Centrale de Nantes (ECN), 2008. Français. ⟨tel-00364945⟩

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