Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Fatigue Life Prediction for the Skin Structures of Aircraft Sensor Pod Under Acoustic Load with Mean Stress

평균 응력을 고려한 음향 하중을 받는 항공기 센서 포드 외피 구조의 내구 수명 분석

  • Min-Hyeok Jeon (Department of Aerospace Engineering, Chungnam National University) ;
  • Yeon-Ju Kim (Department of Aerospace Engineering, Chungnam National University) ;
  • Hyun-Jun Cho (Department of Aerospace Engineering, Chungnam National University) ;
  • Mi-Yeon Lee (Department of Aerospace Engineering, Chungnam National University) ;
  • In-Gul Kim (Department of Aerospace Engineering, Chungnam National University) ;
  • Hansol Lee (Mechanical Design Team, Hanwha Systems Co., Ltd.) ;
  • Jae Myung Cho (Mechanical Design Team, Hanwha Systems Co., Ltd.) ;
  • Jong In Bae (Mechanical Design Team, Hanwha Systems Co., Ltd.) ;
  • Ki-Young Park (Electro-Optics System Team 1, Hanwha Systems Co.)
  • 전민혁 (충남대학교 항공우주공학과) ;
  • 김연주 (충남대학교 항공우주공학과) ;
  • 조현준 (충남대학교 항공우주공학과) ;
  • 이미연 (충남대학교 항공우주공학과) ;
  • 김인걸 (충남대학교 항공우주공학과) ;
  • 이한솔 (한화시스템(주) 기계설계팀) ;
  • 조재명 (한화시스템(주) 기계설계팀) ;
  • 배종인 (한화시스템(주) 기계설계팀) ;
  • 박기영 (한화시스템(주) 전자광학체계1팀)
  • Received : 2022.09.04
  • Accepted : 2022.12.29
  • Published : 2023.02.05
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Abstract

The skin structure of sensor pod mounted on the exterior of aircraft can be exposed to the acoustic dynamic load and static load such as aerodynamic pressure and inertial load during flight. Fatigue life prediction of structural model under acoustic load should be performed and also differential stiffness of model modified by static load should be considered. The acoustic noise test spectrum of MIL-STD-810G was applied to the structural model and the stress response power spectral density (PSD) was calculated. The frequency response analysis was performed with or without prestress induced by inplane static load, and the response spectrum was compared. Time series data was generated using the calculated PSD, and the time and frequency domain fatigue life were predicted and compared. The variation of stress response spectrum due to static load and predicted fatigue life according to the different structural model considering mean stress were examined and decreasing fatigue life was observed in the model with prestress of compressive static load.

Keywords

Acknowledgement

본 논문은 2021년도 한화시스템(주)의 재원을 지원 받아 수행되었습니다.

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