Vibration analysis of rotating blades considering the cross section taper, the pre-twist angle, and the setting angle

단면 테이퍼, 초기 비틀림각, 그리고 장착 각의 영향을 고려한 회전 블레이드의 진동해석

Equations of chordwise and flapwise bending motions for the vibration analysis of rotating pre-twisted blades having tapered cross section and orientation angle are derived by using hybrid deformation variable modeling. The two motions are couples to each other due to the pre-twisted angle of the beam cross section. The derived equations are transformed into dimensionless forms in which dimensionless parameters are identified. The effects of the dimensionless parameters on the modal characteristics of rotating pre-twisted blades having tapered cross section and orientation angle are investigated. The eigenvalue loci veering phenomena is also investigated and discussed in this work.