Abstract: Based on a non linear model of cyclic 2 DOF substructure of shrouded blisk, the natural frequency and forced response of a mistuned shrouded blisk have been studied by using a statistic theory. The mistuned coupling strength between shrouds has been specially studied. The mistuned coupling strength between shrouds and the mistuned natural frequency of blade are considered to distribute normally. The probability, the mean value and the standard deviation of the largest response amplitude of the system have been given.

Key words: bladed- disc, vibr ation, mistuned system