한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제22권4호
  • /
  • Pages.352-357
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  • 2012
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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무베어링 헬리콥터 로터의 지상공진 불안정성 특성 해석

Ground Resonance Instabilities Analysis of a Bearingless Helicopter Main Rotor

  • 윤철용 (한국항공우주연구원 회전익기술팀) ;
  • 기영중 (한국항공우주연구원 회전익기술팀) ;
  • 김태주 (한국항공우주연구원 회전익기술팀) ;
  • 김덕관 (한국항공우주연구원 회전익기술팀) ;
  • 김승호 (한국항공우주연구원 회전익기술팀)
  • 투고 : 2012.01.19
  • 심사 : 2012.03.05
  • 발행 : 2012.04.20
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초록

The ground resonance instability of a helicopter with bearingless main rotor hub were investigated. The ground resonance instability is caused by an interaction between the blade lag motion and hub inplane motion. This instability occurs when the helicopter is on the ground and is important for soft-inplane rotors where the rotating lag mode frequency is less than the rotor rotational speed. For the analysis, the bearingless rotor was composed of blades, flexbeam, torque tube, damper, shear restrainer, and pitch links. The fuselage was modeled as a mass-damper-spring system having natural frequencies in roll and pitch motions. The rotor-fuselage coupling equations are derived in non-rotating frame to consider the rotor and fuselage equations in the same frame. The ground resonance instabilities for three cases where are without lead-lag damper and fuselage damping, with lead-lag damper and without fuselage damping, and finally with lead-lag damper and fuselage damping. There is no ground resonance instability in the only rotor-fuselage configuration with lead-lag damper and fuselage damping.

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참고문헌

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