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http://dx.doi.org/10.3795/KSME-A.2006.30.4.442

Modal Analysis of Rotor System with Anisotropic Stator and Asymmetric Rotor in the Presence of Breathing Crack  

Han Dong-Ju ((주)썬에어로시스 기술연구소)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.30, no.4, 2006 , pp. 442-450 More about this Journal
Abstract
This paper describes the new modal analysis method to detect the presence of the breathing crack in a general rotor system with disk asymmetry and stator anisotropy. It is proposed that the modal analysis using directional frequency response functions (dFRFs), which, accounting for the directivity in modes, clears the heavily over-lapping of other harmonics occurring from non-isotropic properties in addition to those due to crack, can provide an effective method to detect the modes by a crack. The simulations from the simple general rotor model show that the r-dFRFs (reverse dFRFs) for asymmetry confirms a good indicator of the presence of the breathing crack and the instability is primarily influenced by the shaft asymmetry than the breathing crack.
Keywords
Breathing Crack; General Rotor System; Modulated Coordinate; Modal Analysis; Whirl Charts; Stability; Directional Frequency Response Functions;
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