Natural Frequencies and Mode Shapes of Rotating Three Shrouded Bladed Discs Placed on the Part of the Shaft

摘要

In this paper the natural frequencies of rotating single shrouded bladed disc of a steam turbine, a shrouded bladed disc placed on the part of the shaft, as well as those of two and three shrouded bladed discs placed on the part of the shaft are presented. The mode shapes are calculated by using a finite element cyclic symmetry approach. The gyroscopic effects are neglected. The numerical results were compared with the experimental. The calculations show the influence of the shaft on the natural frequencies of the shrouded bladed discs up to four nodal diameters modes.