TRANSIENT NOZZLE EXCITATION OF MISTUNED BLADED DISCS

Abstract A numerical technique to compute the transient response of a mistuned bladed disc (non-identical blades) is presented on the basis of an extended beam theory including bending-bending-torsional vibration and moderately thick plate theory. By using the extended Hamilton's principle and the Ritz method the equations of motion are obtained. The equations of motion are transformed by using the techniques of modal approximation. Some fundamental studies of transient vibration of several mistuned bladed discs are discussed: e.g., the influence of the stagger angle, the non-symmetrical cross-section area and the twist angle of the blades on stress distributions of the blades around the disc. The best and worst distribution of detuned blades from the stress point of view is shown.