Reduction of Multistage Rotor Models Using Cyclic Modeshapes Available to Purchase

This study deals with the reduction of models of bladed disks assemblies through the use of mono-harmonic cyclic mode-shapes. The first part of this paper describes how the classical substructuring technique in cyclic symmetry can be extended to rotors in the case of non compatible meshes to compute mono-harmonic eigenvectors. The second part of the paper then presents the method employed by the authors to seek the full modes of the rotor in a subspace generated from a set of such modeshapes. All the concepts developed here are illustrated on a representative sample.