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Instability zones for isotropic and anisotropic multiblades rotor configurations

Sanches, Leonardo and Michon, Guilhem and Berlioz, Alain and Alazard, Daniel Instability zones for isotropic and anisotropic multiblades rotor configurations. (2010) In: 17ème conférence Vibrations, Chocs et Bruits 2010, 15-17 Juin 2010, Ecully, France . (Unpublished)

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Abstract

Helicopter ground resonance is an unstable dynamic phenomenon which can lead to the total destruction of the aircraft during take-off or landing phases. The earliest research in this domain was done by Coleman and Feingold around the 60's decade. The prediction of the instability was possible by using classical procedures once the rotor was considered as isotropic and, consequently, the periodic equations of motions could be simplified to a system with constant coefficients by introducing a change of variables, knew as Coleman Variable Transformation. With the goal of further comprehend the phenomenon and the influence of the anisotropic properties of rotors, analysis in the periodic set of equations of motions is envisioned. For this, Floquet's theory (Floquet's Method – FM) is used. In the present work, analyses of predicting the ground resonance phenomenon in isotropic and anisotropic rotor configurations are explored. The conclusions lead to verify the appearance of bifurcation points depending on the anisotropic characteristic present in the rotor.

Item Type:Conference or Workshop Item (Lecture)
Audience (conference):National conference without published proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Ecole des Mines d'Albi-Carmaux - EMAC
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
Département de Mathématiques, Informatique, Automatique - DMIA (Toulouse, France) - Automatique, Dynamique et Interface des Systèmes - ADIS
Département de Mécanique des Structures et Matériaux - DMSM (Toulouse, France)
Institut Clément Ader - ICA (Toulouse, France) - Modélisation des Systèmes et Microsystèmes Mécaniques - Comportement dynamique des structures
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Deposited By:Leonardo Sanches

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