Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Vibration Characteristics of Rotating Disks with Aerodynamic Effect (I) - Theoretical Analysis -

공기 유동 효과를 고려한 회전 디스크의 진동 특성 (I) - 이론적 해석 -

  • 이승엽 (서강대학교 기계공학과) ;
  • 임효석 (서강대학교 대학원 기계공학과)
  • Published : 2008.02.05
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Abstract

The aerodynamically excited vibration and natural frequency of rotating disks are analytically studied in this paper. The theoretical analysis uses a fluid-structure model where the aerodynamic effects are represented in terms of elastic, lift and drag forces. The explicit expressions on natural frequencies of the air coupled disk are obtained as functions of the aerodynamic coefficients. for the three cases where the disk rotates in three different cases (in vacuum, in open air without enclosure, and close to rigid wall). The theoretical results give that the natural frequencies of rotating disks in air are smaller than those in vacuum, because the effect of the added fluid mass decreases the frequencies. This paper also proposes an analytical method to predict the flutter speed of a rotating disk.

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References

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