Impact of constrained layer damping patches on the dynamic behavior of a turbofan bladed disk

Abstract

This work introduces a novel approach to modeling the impact of constrained layer damping patches on the behavior of rotating host structures, with a focus on bladed disks of turbofan engines. Constrained layer damping patches increase structural damping by dissipating the vibratory energy of the structure into heat through the viscoelastic properties of the elastomer material used in the patch. This paper proposes a dedicated numerical tool to model the behavior of such structures. A hyperelastic model is introduced to model the static response of the elastomer and a viscoelastic model is introduced into the dynamic problem. This hyperelastic–viscoelastic framework allows the modeling of the response of the constrained layer damping patch to large centrifugal forces and small dynamic perturbations. The dynamic behavior of an industrial bladed disk is then computed within this framework and compared to experimental test data. The results of this comparison validates the proposed model and highlights the efficiency of the constrained layer damping patch, defined as the amount of damping added to the structure, for this type of structures.