Vibration of Rotating Bladed Disc Excited by Stationary Distributed Forces

Abstract

This paper presents the results of theoretical and experimental studies which have been carried out to investigate the diametral vibration modes of rotating bladed discs. The theoretical model has been considered as a linear system and only the diameter modes have been discussed. The vibration of the bladed disc has been obtained by superposing vibrations of discs assumed to have a single blade respectively, so that the exciting condition has been derived. This condition depends upon the relations among the number of rotating blades, the number of exciting sources on the stationary side and the number of diametral nodal lines. These relations have been verified by experimental results. It is confirmed that the disc does not resonate when the exciting condition is not satisfied, even if the exciting frequencies coincide with natural frequencies of the disc.