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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: Finite element model
Cracked rotor
Non-destructive evaluation Slenderness ratio
Crack depth Crack location
CLC No: TH113.1 O322
国家973重点基础研究规划(G1998020321)、国家自然科学基金(10176014)和振动、冲击、噪声国家重点实验室开放基金(VSN-
2002-03)资助项目. Received 20030520, received in revised form 20030910
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