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<p>This paper focused on exploring the thermoelastic coupled vibration behavior of rotor systems at high operating temperatures. A five-bladed rotor system made of K409 alloy material was the focus of attention. First, the dynamic response of a single blade under the influence of the temperature field was considered. Second, a new coupling mode, the shaft blade heating crack (SBHC) mode, was cited. Finally, the behavior of the system when cracks were involved in the coupling was described. The finite element method (FEM) and analytical modal method (AMM) were used for the study. A single heated blade and its rotor system with cracks of different depths at specific locations (<i>Xw</i> = 0.1) were exhaustively modal analyzed. The results showed that the second-order frequency has a singularity at a specific crack depth at the crack positions 0.2 and 0.9. The rotation effect was also discussed in this paper.</p>

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Numerical investigation of thermoelastically coupled vibrations of a rapidly rotating rigid-disk rotor system with a blade crack

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Yi-Jui Chiu,
  • Yi-Xian Gu,
  • Chia-Hao Yang,
  • Sheng-Rui Jian,
  • Ding Chen

摘要

This paper focused on exploring the thermoelastic coupled vibration behavior of rotor systems at high operating temperatures. A five-bladed rotor system made of K409 alloy material was the focus of attention. First, the dynamic response of a single blade under the influence of the temperature field was considered. Second, a new coupling mode, the shaft blade heating crack (SBHC) mode, was cited. Finally, the behavior of the system when cracks were involved in the coupling was described. The finite element method (FEM) and analytical modal method (AMM) were used for the study. A single heated blade and its rotor system with cracks of different depths at specific locations (Xw = 0.1) were exhaustively modal analyzed. The results showed that the second-order frequency has a singularity at a specific crack depth at the crack positions 0.2 and 0.9. The rotation effect was also discussed in this paper.