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Transformation of Flight Load to Test Load for the Static Load Test of External Fuel Tank for Aircraft

항공기용 외부연료탱크 정하중시험을 위한 비행하중의 시험하중으로의 변환

  • Kim, Hyun-gi (Korea Aerospace Research Institute) ;
  • Kim, Sung Chan (Korea Aerospace Research Institute) ;
  • Park, Sung Hwan (Hanwha Aerospace Corporation) ;
  • Ha, Byoung Geun (Hanwha Aerospace Corporation) ;
  • An, Su Hong (Hanwha Aerospace Corporation) ;
  • Kim, Jun Tae (Hanwha Aerospace Corporation)
  • 김현기 (한국항공우주연구원) ;
  • 김성찬 (한국항공우주연구원) ;
  • 박성환 (한화에어로스페이스) ;
  • 하병근 (한화에어로스페이스) ;
  • 안수홍 (한화에어로스페이스) ;
  • 김준태 (한화에어로스페이스)
  • Received : 2020.08.13
  • Accepted : 2020.11.12
  • Published : 2021.02.28

Abstract

In this study, for conducting a static load test of an external fuel tank used for an aircraft, the flight load acting on the external fuel tank was converted to the test load and the suitability of the converted test loads was confirmed. In order to calculate the test load from the flight load, the external fuel tank was divided into several sections. Shear load, moment by unit shear load, and unit moment were calculated for each section. Test loads for each section were then calculated by computing the shear load, the moment of each section, and flight load condition. In actual static load tests, it might not be possible to impose the test load in the calculated position due to physical constraints. Therefore, after determining positions in which the load could be imposed in the actual test, the test load calculated for each section was redistributed to selected positions. Finally, a test load plan was established by applying a whiffle tree to enhance the efficiency of the test performance while making it easier to operate the actuator. The reliability of the test load plan was verified by comparing it with flight load conditions.

본 연구에서는 항공기용 외부연료탱크의 정하중시험을 수행하기 위해서 외부연료탱크에 작용하는 비행하중을 시험하중으로 변환하고 변환된 시험하중들의 적합성을 검증하였다. 비행하중으로부터 시험하중을 계산하기 위해서 외부연료탱크를 몇 개의 구간으로 나누고, 각 구간별로 단위하중과 단위모멘트에 의해 발생하는 전단하중과 모멘트를 계산하였다. 그리고, 산출된 전단하중과 모멘트 그리고 비행하중 조건과의 연산을 통해 각 구간별 시험하중을 계산하였다. 실제 구조시험에서는 물리적 제약 등으로 시험하중을 계산 지점과 동일한 위치에 부과할 수 없는 경우가 많기 때문에 실제 시험에서 하중을 부과할 수 있는 위치들을 결정한 후, 각 구간에서 계산된 시험하중을 선정된 위치로 재분포시켰다. 그리고, 시험수행의 효율성을 높이면서 작동기 운용이 용이하도록 휘플트리를 적용하여 최종 시험하중 계획을 수립하였고, 비행하중 조건과의 비교를 통해 수립된 시험하중 계획의 신뢰성을 확인하였다.

References

  1. Y.S. Joo, M.S. Kim, B.H. Park, C.W. Shul, H.Y. Kim, J.K. Jung, B.W. Jeong, "Full Scale Durability Test of Basic Trainer", Journal of the Korean society for aeronautical and space sciences, vol. 30, no. 5, pp. 127-133, 2002. https://doi.org/10.5139/JKSAS.2002.30.5.127
  2. I.H. Choi, S.M. Ahn, "A Study on Calculation of Test Load of Full-Scale Airframe Structural Test of Composite Aircraft", Aerospace Engineering and Technology, vol. 10 no. 2, pp. 146-1537, 2011.
  3. S.C. Kim, S.J. Kim, J. Shim, "Development of Test Equipment and Fixture for T-50 Full-Scale Airframe Static Test", The 8th Symposium on Aircraft Development Technology, pp. 360-363, 2002.
  4. D.B. Hong, H.C. Lee, "An Approach on Structure Test for the Development of FAR Part 25, Transport Category Aircraft", The Korean Society for Aeronautical and Space Sciences 2011 Spring Conference, pp. 896-901, 2011.
  5. E.F. Bruhn, "Analysis and Design of Flight Vehicle Structures", Tri-State Offset Company, USA, 1973.
  6. H.Y. Won, D.S. Jeon, S.W. Lee, B.G. Kim, H.C. Lee, "Aircraft Structural Test," Cheong Moon Gak, Korea, 2013.