Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Internal Components Arrangement of MR Damper Landing Gear for Cavitation Prevention

캐비테이션 방지를 위한 MR 댐퍼형 착륙장치의 내부 형상 배치에 대한 연구

  • Joe, Bang-Hyun (Dept. Of Aerospace of Mechanical Engineering at Korea Aerospace University) ;
  • Jang, Dae-Sung (Dept. Of Aerospace of Mechanical Engineering at Korea Aerospace University) ;
  • Hwang, Jai-Hyuk (Dept. Of Aerospace of Mechanical Engineering at Korea Aerospace University)
  • 조방현 (한국항공대학교 항공우주 및 기계공학부) ;
  • 장대성 (한국항공대학교 항공우주 및 기계공학부) ;
  • 황재혁 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2020.05.18
  • Accepted : 2020.09.01
  • Published : 2020.10.31
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Abstract

The landing gear of an aircraft is a device that absorbs and dissipates shock energy transmitted from the ground to the fuselage. Among the landing gears, the semi-active MR damper landing gear is supposed to show high-shock absorption efficiency under various landing conditions and secure the stability when out of control. In the case of the MR damper landing gear using an annular channel rather than orifice, Amesim, a commercial multi-physics program, is considered as more useful than the conventional two-degree-of-freedom model because the damping force generated by the pressure drop through the flow annular path can cause cavitation in the low-pressure chamber of the MR damper with a specific internal structure. In this paper, the main dynamic characteristics of the MR damper landing gear with an annular type flow path structure has been analyzed under the condition of cavitation. Based on the analysis results using Amesim, a design guideline for the MR damper flow path that prevents cavitation has been proposed based on the modification of the arrangement of internal components of the damper. The guideline was verified through a drop simulation.

항공기의 착륙장치는 지상에서 동체로 전달되는 충격에너지를 흡수 및 소산시키는 장치이다. 착륙장치 중 반능동형 MR 댐퍼 착륙장치는 다양한 착륙조건에서 높은 충격흡수효율을 보여주며 제어 불능 시 안정성을 확보할 수 있는 장점이 있다. 오리피스가 아닌 환형 관유로를 이용하는 MR 댐퍼 착륙장치의 경우, 유로 압력강하로 인해 발생하는 감쇠력이 MR 댐퍼 내부 형상 구조에 따라 저압 챔버에서 캐비테이션을 유발할 수 있어 기존의 2 자유도계 모델링 기법보다 다중물리시스템 해석 프로그램인 Amesim이 더 유용하다. Amesim을 이용한 해석결과를 바탕으로 착륙장치 내부 유로 형상 배치를 수정하여 캐비테이션을 방지할 수 있는 유로 구조를 제안하였고 낙하 시험 시뮬레이션 결과를 통해 이를 검증하였다. 본 논문에서는 환형 관로 형태 유로 구조를 갖는 MR 댐퍼형 착륙장치의 캐비테이션 발생시 주요 특성을 파악하였고, 아울러 내부형상 배치 수정을 통해 이를 방지하는 방안을 제시하였다.

Keywords

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