Analysis of Effects of Mistuning on Forced Response of Bladed disks with Nonlinear Dry Friction Damping by Multi-harmonic Method

摘要

The inevitable mistuning of blade properties can increase the forced responses of bladed disks. The blade-to-blade dampers are used to reduce their resonant vibration. In this paper, based on the harmonic balance method (HBM), an efficient multi-harmonic method (MHM) is presented for studying effects of mistuning on resonant features of bladed disks with nonlinear blade-to-blade dry friction damping. The proposed method is validated by numerical integration method. Analysis of forced response is performed by the MHM for both tuned and mistuned systems with various coupling, viscous damping, dry friction and blade stiffness mistuning etc. The results demonstrate that: for the weakly coupled bladed disk with nonlinear blade-to-blade dry friction damping, mistuning can reduce resonant amplitudes of the system significantly; when the viscous damping and dry friction are all smaller, and mistuning can broaden the resonant frequency region, and produce multiple resonant peaks.