Detection of a Rotor Crack by a Periodic Excitation

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  • ISHIDA Yukio
    Department of Electronic-Mechanical Engineering, Nagoya University
  • INOUE Tsuyoshi
    Department of Electronic-Mechanical Engineering, Nagoya University

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  • 周期的加振によるロータクラックの検出
  • シュウキテキカシン ニ ヨル ロータクラック ノ ケンシュツ

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Abstract

Dynamic characteristics of a cracked rotor with a periodic excitation force are investigated. Due to the open-close mechanism of the rotor crack, the equations of motion of a cracked rotor have linear and nonlinear parametric terms. When a periodic excitation force is applied to a cracked rotor, various kinds of resonances, which are not observed in a symmetric rotor and an asymmetric rotor with linear spring characteristics, occur due to the unique spring characteristics of a cracked rotor. We clarify characteristics of these resonances theoretically and experimentally. These results enable us to detect a crack on-line without stopping the system.

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