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

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Analyses on Aerodynamic and Inertial Loads of an Airborne Pod of High Performance Fighter Jet

고기동 항공기 하부 장착 파드의 공력 및 관성하중 분석 연구

  • Lee, Jaein (Department of Aerospace Engineering, Korea Air Force Academy) ;
  • Shin, Jinyoung (Department of Aerospace Engineering, Korea Air Force Academy) ;
  • Cho, Donghyun (Department of Aerospace Engineering, Korea Air Force Academy) ;
  • Jung, Hyeongsuk (Aerospace Design-Airworthiness Institute, Konkuk University) ;
  • Choi, Taekyu (Mechanical Convergence Laboratory, LIG Nex1, Co., Ltd.) ;
  • Lee, Jonghoon (Mechanical Convergence Laboratory, LIG Nex1, Co., Ltd.) ;
  • Kim, Youngho (Defense Space Technology Center, Agency for Defense Development) ;
  • Kim, Sitae (Department of Mechanical Engineering, Korea Air Force Academy)
  • 이재인 (공군사관학교 항공우주공학과) ;
  • 신진영 (공군사관학교 항공우주공학과) ;
  • 조동현 (공군사관학교 항공우주공학과) ;
  • 정형석 (건국대학교 항공우주설계인증연구소) ;
  • 최태규 (LIG넥스원(주) 기계융합연구소) ;
  • 이종훈 (LIG넥스원(주) 기계융합연구소) ;
  • 김영호 (국방과학연구소 국방우주기술센터) ;
  • 김시태 (공군사관학교 기계공학과)
  • Received : 2021.08.19
  • Accepted : 2021.11.19
  • Published : 2022.02.05
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Abstract

A fighter performing a reconnaissance mission is equipped with a pod that drives optical/infrared sensors for acquiring and identifying target information on the lower part of the fuselage. Due to the nature of the reconnaissance mission, the fighter performs high speed evasive maneuvers, and the resulting load should be considered importantly for the development of the pod. This paper concerns a numerical investigation into the inertial and aerodynamic loads of the airborne pod of high performance aircrafts. For the aerodynamic load analysis, the pylon and pod shapes are added to the fighter 3D model, and the commercial software was used for static and dynamic analysis. Considering the practical mission conditions, the common/extreme conditions were established respectively in the static and dynamic situations of pods and the driving torque could be tripled under dynamic conditions. In the analysis of inertia load, a 3-DOF model considering roll and turning maneuvers was derived by the Lagrangian method, and then the numerical integration method was applied to the analysis. As a results, it was conformed that the inertia load was generally induced at a low level compared to the aerodynamic load, but depending on the unbalance mass condition of the pod, the inertia load cannot be negligible.

Keywords

Acknowledgement

본 연구는 정부(국방과학연구소)의 재원으로 LIGNex1의 지원을 받아 수행되었습니다.

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