블레이드와 로터의 결합 조건에 의한 Mistuning 효과

Abstract

In this study, the assembling conditions of blades and rotors are investigated by the FEM model of a blade with the different boundary conditions. It is assumed that the modal properties of blades are identical and the blade modal frequencies are changed by the assembling condition only. It is shown that the change in modal frequency by the assembling condition is approximately 0.25 % in normal operating conditions. However, the variance of blade response can be increased by more than 30 % under narrow-band random excitations.