Dynamics of Multistage Bladed Disks Systems

Denis Laxalde (1, 2) , Jean-Pierre Lombard (2) , Fabrice Thouverez (1)

1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
2 SNECMA Siège [Courcouronnes]

This paper presents a new and original method for dynamical analysis of multistage cyclic structures such as turbomachinery compressors or turbines. Each stage is modeled cyclically by its elementary sector and the interstage coupling is achieved through a cyclic recombination of the interface degrees of freedom. This method is quite simple to set up; it allows us to handle the finite element models of each stage's sector directly and, as in classical cyclic symmetry analysis, to study the nodal diameter problems separately. The method is first validated on a simple case study which shows good agreements with a complete 360 deg reference calculation. An industrial example involving two HP compressor stages is then presented. Then the forced response application is presented in which synchronous engine order type excitations are considered.

Mots clés: discs (structures); blade; finite element analysis; multi-stage; cyclic symmetry; vibration; compressors; gas turbines

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

Denis Laxalde, Jean-Pierre Lombard, Fabrice Thouverez. Dynamics of Multistage Bladed Disks Systems. Journal of Engineering for Gas Turbines and Power, 2007, 129 (4), pp.1058-1064. ⟨10.1115/1.2747641⟩. ⟨hal-00243153⟩