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Crack identification in a rotor with an open crack

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Abstract

A finite element (FE) model, which is based on a transfer matrix analysis and local flexibility theorem, is introduced for crack identification of a static (non-rotating) rotor with an open crack. Through numerical simulation, the effects of crack location and crack depth on the mode shapes and the changes in the eigenfrequencies of the cracked rotor are investigated. A crack identification algorithm that makes use of the translations of the first mode at two symmetric points and the contour diagram of crack location versus crack depth for the first two given normalized eigenfrequencies is proposed to estimate the crack location and depth in the rotor. Two illustrative examples are demonstrated and compared for availability and validity of the proposed algorithm.

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Authors and Affiliations

  1. The State Key Laboratory of Mechanical System & Vibration, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China

    Guang Ming Dong & Jin Chen

Authors
  1. Guang Ming Dong
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  2. Jin Chen
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Corresponding author

Correspondence to Guang Ming Dong.

Additional information

This paper was recommended for publication in revised form by Associate Editor Eung-Soo Shin

Guang Ming Dong received his B.S. and M.S. degrees in Mechanical Engineering from Xi’an Jiao Tong University, China, in 1999 and 2002, respectively. He then received his Ph.D. degree in Mechanical Engineering from Shanghai Jiao Tong University, China, in 2007. Dr. Dong is currently a postdoctoral research fellow at the State Key Laboratory of Mechanical System and Vibration in Shanghai Jiao Tong University, China. Dr. Dong’s research interest is on damage identification and health monitoring of structural and mechanical systems using global methods, specifically, vibrationbased damage detection.

Jin Chen received his B.S. and M.S. degrees in Mechanical Engineering from Shanghai Jiao Tong University (SJTU), China, and his Ph.D. degree from Tokyo Institute of Technology, Japan. He is currently a professor and Ph.D. supervisor in Shanghai Jiao Tong University, the Director of the SJTU Library, and vice director of State Key Laboratory of Mechanical System and Vibration. Dr. Chen is also a member of the Standing Committee of the Chinese Society of Vibration Engineering, president of the Fault Diagnosis Society of China, Editor of the Journal of Mechanical System and Signal Processing, Standing Editor of the Journal of Vibration, Testing, and Diagnostics, and Chairman of the Alumni Association of Tokyo Institute of Technology in Shanghai.

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Dong, G.M., Chen, J. Crack identification in a rotor with an open crack. J Mech Sci Technol 23, 2964–2972 (2009). https://doi.org/10.1007/s12206-009-0814-5

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  • DOI: https://doi.org/10.1007/s12206-009-0814-5

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