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

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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An Experimental Study on Micro-vibration Measurement Methods of a Reaction Wheel

반작용휠의 미소진동 측정법에 관한 실험적 연구

  • 김대관 (한국항공우주연구원 위성제어팀) ;
  • 오시환 (한국항공우주연구원 위성제어팀) ;
  • 이선호 (한국항공우주연구원 위성제어팀) ;
  • 용기력 (한국항공우주연구원 위성제어팀)
  • Received : 2011.06.01
  • Accepted : 2011.08.08
  • Published : 2011.09.20
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Abstract

A reaction wheel assembly(RWA) is the largest disturbance source that can induce high frequency micro-vibration on an optical payload of satellites. To ensure a tight pointing-stability budget of satellites, the RWA disturbance effect on spacecraft should be accurately analyzed and evaluated for whole design phases. For this purpose, the micro-vibration disturbance of RWA should be precisely measured. In the present study, two measurement methods on RWA micro-vibration disturbances are compared and investigated. One is a free run-down speed test and the other is a constant speed test. The micro-vibration data measured by the two methods are analyzed in terms of spectrum characteristics, static and dynamic imbalance values, and root sum square(RSS) values. The analysis results show that both methods can measure very similar results in time and frequency domains and that the free run-down speed method is more adequate in respects to wheel friction modeling, noise rejection of imbalance and RSS peak evaluation.

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References

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