SOME STUDIES ON FREE VIBRATION ANALYSIS OF CYCLIC SYMMETRIC STRUCTURES USING SUBSPACE METHOD

The free vibration analysis of cyclic symmetric structures is considered as a Hermitian eigenvalue problem in semi‐complex domain using subspace iteration method is presented. The trial vectors are selected using a modified Ritz vector scheme. A modified convergence criterion which gives true error estimates which is suited for clustered eigenvalue problems is presented. Also the effect of purification of trial vectors on convergence is considered.