A reduction technique for mistuned bladed disks with superposition of large geometric mistuning and small model uncertainties

Abstract

International audienceA new method for vibration analysis of mistuned bladed disks is presented. The method combines two previously reported modeling techniques in order to study the effects of small random parameter variation on geometrically mis-tuned bladed disks. It is based on the observation that the nominal projections usually possess a certain degree of ro-bustness tolerating small perturbations. Hence the subspace spanned by a sufficient number of compensated tuned system normal modes can be used to repeatedly project models with small random parameter variation. The method is validated numerically on an industrial bladed disk model, both free and forced responses are compared with full model finite element analysis. The benchmark cases show acceptable accuracy while retaining low computational cost to build and evaluate obtained ROM