한국항공우주학회지 (Journal of the Korean Society for Aeronautical & Space Sciences)

  • 제41권4호
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  • Pages.284-290
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  • 2013
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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SDRE 기법을 이용한 비선형 미지입력 관측기 설계와 반작용 휠의 고장 검출

Design of Nonlinear Unknown Input Observer by SDRE Method and Fault Detection of Reaction Wheels

  • 투고 : 2013.01.19
  • 심사 : 2013.03.31
  • 발행 : 2013.04.01
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초록

위성의 각속도를 추정하고 반작용 휠의 고장을 검출하기 위하여 비선형 미지입력 관측기를 제안하였다. 위성의 각속도 추정을 위해서 입력 값을 필요로 하는데, 구동기에 고장이 발생하는 경우에 정확한 각속도 추정이 어렵다. 미지입력 관측기는 미지의 고장에 영향을 받지 않으면서 상태추정이 가능하다. 본 논문에서는 SDRE 기법을 적용하여 비선형 미지입력 관측기를 설계하였고, 시뮬레이션을 이용하여 제안한 방법을 검증하였다. 다양한 형태로 동시에 고장이 발생하더라도, 각속도 추정 및 고장 검출이 가능하였다.

The authors propose a nonlinear unknown input observer to estimate the angular speed of a satellite and to detect faults of reaction wheels. Input values are necessary to estimate the angular speed. Therefore, estimation errors are inevitable if faults occur in actuators or reaction wheels. Unknown input observers are useful to estimate the states of a system without being affected by unknown faults. The authors have designed a nonlinear unknown input observer by using the SDRE method and verified the proposed observer via numerical simulations. In spite of various and simultaneous faults, we have estimated the states and detected faults exactly by the proposed nonlinear unknown input observer.

키워드

참고문헌

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피인용 문헌

  1. Nonlinear Observer Design for Satellite Angular Rate Estimation by SDRE Method vol.42, pp.10, 2014, https://doi.org/10.5139/JKSAS.2014.42.10.816