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Instabilité du flottement gyroscopique des convertibles

Gianni Naccarato 
Abstract : In cruise flight, the tiltrotor (VSTOL) is subject to a dynamic aeroelastic instability called whirl flutter. This phenomenon is characterized by whirl movements of the rotor that increase structure load and whose consequences can be fatal. The aim of this study is to set up an analytical model allowing to accurately simulate whirl flutter. A modelisation tool has been developed in order to adapt easily the analytical model to the choice of the studied system. The Lagrange equations are used and developed at first order. Aerodynamic blade loads are introduced using a quasistatic two-dimensional linear lift model. The final equations represent the isolated assembly wing-mast-rotor. This study is based on a 3 blade gimbal rotor with pitch flap coupling and the pitch adapts automatically to the forward speed. The analytical model has been validated for different fight speeds and different wing stiffness using wind tunnel data obtained with a semi-span model. The predicted critical speeds are verified and parameter studies provide knowledge that will allow to optimize the characteristics of the system in order to increase aeroelastic stability.
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Submitted on : Monday, April 5, 2004 - 5:57:23 PM
Last modification on : Wednesday, June 1, 2016 - 11:04:44 PM
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  • HAL Id : tel-00005728, version 1



Gianni Naccarato. Instabilité du flottement gyroscopique des convertibles. Mécanique []. Arts et Métiers ParisTech, 2003. Français. ⟨NNT : 2003ENAM0007⟩. ⟨tel-00005728⟩



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