Mode localization analysis of mistuned bladed disk coupled by interstage contact

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (9) : 46-49.

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Mode localization analysis of mistuned bladed disk coupled by interstage contact

Wang Ai-lun1,2; Chen Jin-bo1,2

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Abstract

The finite element model of two-stage bladed disks in gas turbine rotor was established. The modal characteristics of multistage and single bladed disk were compared. The effect of interstage contact coupling on frequency veering characteristic of bladed disk was focused on. The results show that new modes of stage-coupled vibration appear due to interstage contact coupling. The frequency veering characteristic is modified that modes near frequency veering region are less dense, such modification leads to a low sensitivity to mistuning for bladed disk. The modal characteristic of mistuned two-stage bladed disks was analyzed. It is verified that mode localization degree of mistuned bladed disk is reduced greatly.

Key words

bladed disk / interstage contact coupling / frequency veering / mistuning / mode localization

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Wang Ai-lun;Chen Jin-bo;. Mode localization analysis of mistuned bladed disk coupled by interstage contact[J]. Journal of Vibration and Shock, 2011, 30(9): 46-49