STUDY OF LOCALIZED VIBRATIONS OF MISTUNED BLADES OF CENTRIFUGAL COMPRESSOR

Abstract eng:
Presented paper deals with sensitivity analysis of a mistuning centrifugal compressor. Vibrations of blades of mistuning bladed disk generate local zoning of vibration modes as well as amplitude magnification, which primarily reduces the high cycle fatigue life of engine. The sensitivity analysis uses a criteria for determination of the level of these local mode effects depending on mistuning deviations. The analysis shows that some vibration modes of centrifugal compressor structure which are characterized by significant percentage of blades on the total bladed disk strain energy, have a significantly higher sensitivity to blade mistuning. These vibration modes are characterized with low structural coupling blades such as higher bending modes or modes with high numbers of nodal diameter lines.

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