Study on vibration response reduction of bladed disk by use of asymmetric vane spacing (study on response reduction of mistuned bladed disk)

Abstract

It is well known that asymmetric vane spacing can result in decreased levels of the excitation at specific frequencies. In this paper, the resonant response reduction of mistuned bladed disks due to asymmetric vane spacing is studied theoretically for the most probable asymmetric vane, in which the vane count of the upper and lower half is slightly different. First, a method for predicting the maximum amplitude of the mistuned bladed disk for the asymmetric vane spacing is proposed. Second, a parametric study is carried out using Monte Carlo simulation to clarify the vibration response characteristics of the mistuned bladed disk for the asymmetric vane spacing. From these results, it is concluded that asymmetric vane spacing is effective for reduction of resonant amplitudes of a mistuned bladed disk if a multi-resonance phenomenon does not appear. Copyright © 2012 Gas Turbine Society of Japan.