关键词: 长径比, 裂纹深度, 裂纹位置, 裂纹转子, 无损估计, 有限元模型

Abstract: A simplified finite element model for cracked rotor is presented, which is based on local flexibility theorem and transfer matrix analysis. By numerical simulation, the effects of the slenderness ratio, the crack depth and location on the changes in eigenfrequencies and mode shapes for a static (non-rotating) rotor with an open crack are investigated. A new non-destructive evaluation algorithm that uses the first two normalized eigenfrequencies and two translations of the first mode shape to predict the crack parameters is proposed, and an illustrative example demonstrates the validity and feasibility of the proposed algorithm.

Key words: Crack depth, Crack location, Cracked rotor, Finite element model, Non-destructive evaluation, Slenderness ratio