Uncertainty treatment in forced response calculation of mistuned bladed disk

Mistuning, imperfections in cyclical symmetry of bladed disks is an inevitable and perilous occurrence due to many factors ncluding manufacturing tolerances and in-service wear and tear. It can cause some unpredictable phenomena such as mode splitting, ode localization and dramatic difference in forced vibration response. In this paper first, a method is presented which calculates he forced vibration response of a mistuned system based on an exact relationship between tuned and mistuned systems. Then, the enetic algorithm is used for solving an optimization problem to find the worst-case response of bladed-disk assembly. The second art tries to find methods to reduce the system worst-case response. Intentional mistuning which breaks the nominal symmetry of tuned bladed disk and rearranging the bladed-disk assembly are introduced and used to reduce the system worst-case response. inally, a two degree of freedom per blade simplified model with 56 blades is used to demonstrate the capabilities of the techniques n reducing the worst response of the bladed-disk system. 2009 IMACS. Published by Elsevier B.V. All rights reserved.