Effects of geometrical nonlinearities for a rotating intentionally mistuned bladed-disk

Anthony Picou (1) , Evangéline Capiez-Lernout (1) , Christian Soize (1) , Moustapha Mbaye

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

The present paper describes a computational methodology adapted to the analysis of the nonlinear dynamical behavior of a detuned bladed disk. The context of the analysis is the following : (1) the detuning is taken into account by voluntarily breaking the cyclic symmetry of the structure with the use of a pattern constituted of different blade types; (2) the structure is assumed to undergo large strain/displacements induced by the geometrical nonlinear effects; (3) the prestresses and the gyroscopic effects induced by the rotating motion are considered in the nonlinear dynamical analysis. The computational strategy has to be compatible with the industrial context. Consequently, a particular attention is paid to the construction of an adapted nonlinear reduced-order model. Finally, the proposed methodology is applied on a complex bladed disk structure.

Mots clés: Nonlinear structural dynamics; Geometrical nonlinearities; Rotating bladed-disk; Intentionally detuned

Domaines: Mécanique des structures [physics.class-ph]; Vibrations [physics.class-ph]

Anthony Picou, Evangéline Capiez-Lernout, Christian Soize, Moustapha Mbaye. Effects of geometrical nonlinearities for a rotating intentionally mistuned bladed-disk. Conference on Noise and Vibration Engineering (ISMA 2018), Sep 2018, Leuven, Belgium. pp.1-11. ⟨hal-01876795⟩