Intentional Blade Mistuning to Emulate the Dynamic Influence of Split Ring Damper

Abstract

A novel methodology to predict responses of bladed disks incorporated with a split ring damper is proposed. To account for the dynamic characteristics of a split ring damper, intentional blade stiffness mistuning is presented. It is assumed that the mistuning is proportional to the blade stiffness matrix and uniformly distributed to all blades. Therefore, responses of bladed disks integrated with a split ring damper are captured by the detuned bladed disk integrated with a continuous ring damper. The proposed method is demonstrated through a lumped parameter model and validated using a complete finite element model. A key advantage of the proposed approach is that the dynamic characteristics of a split ring damper are emulated by a continuous ring damper in the detuned bladed disk. Moreover, the approach holds the potential to facilitate reduced-order modeling (ROM) by employing sector-level calculations. This results in substantial reductions in computational efforts while maintaining accurate predictions of forced responses.