A reduced-order model of detuned cyclic dynamical systems with geometric modifications using a basis of cyclic modes

M. Mbaye (1, 2) , Christian Soize (1) , J.-P. Ousty (2)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
2 Turbomeca

A new reduction method for vibration analysis of intentionally mistuned bladed disks is presented. The method is built for solving the dynamic problem of cyclic structures with geometric modifications. It is based on the use of the cyclic modes of the different sectors, which can be obtained from a usual cyclic symmetry modal analysis. Hence the projection basis is constituted; as well as, on the whole bladed disk, each sector matrix is reduced by its own modes. The method is validated numerically on a real bladed disk model, by comparing free and forced responses of a full model finite element analysis to those of a reduced-order model using the new reduction method.

Mots clés: FUNDAMENTAL MISTUNING MODEL; BLADED DISKS; NATURAL FREQUENCIES; VIBRATION; IDENTIFICATION; ASSEMBLIES

Domaines: Mécanique [physics.med-ph]

M. Mbaye, Christian Soize, J.-P. Ousty. A reduced-order model of detuned cyclic dynamical systems with geometric modifications using a basis of cyclic modes. Journal of Engineering for Gas Turbines and Power-Transactions of the Asme, 2010, 132 (11), pp.Article Number 112502. ⟨10.1115/1.4000805⟩. ⟨hal-00684307⟩