A three dimensional approach to blade packet vibrations

A finite element analysis for the free vibration of blade packets is discussed in this paper. A three dimensional isoparametric quadratic element with three degrees of freedom (u, v and w) per node is used for the analysis. The analysis indicates the effects of the presence of the shroud on the natural vibrations of independent blades and the blade packet. Since the blade packets are analyzed as three dimensional structures, all the natural modes can be determined. The natural modes thus determined include the batch modes arising due to the presence of the shroud. Batch modes occur both in bending and torsion. Two blade packets are illustrated here to outline the utility of the method. © 1984.