DOI QR코드

DOI QR Code

ECU 응답특성 분석을 통한 T-50 계열 항공기 보조동력장치 자동 꺼짐 개선에 관한 연구

A study on the improvement of Auxiliary Power Unit auto-shutdown of T-50 series aircraft based on analysis of ECU response characteristics

  • Received : 2017.02.09
  • Accepted : 2017.03.10
  • Published : 2017.03.31

Abstract

T-50 계열 항공기는 비행 전 지상에서 비상동력계통 작동 점검을 위해 보조동력장치 GEN TEST를 수행하게 된다. 만일 GEN TEST 수행 중 비상동력계통에 전원이 정상적으로 공급되지 않을 경우 ECU의 응답 신호를 통해 보조동력장치가 자동으로 꺼지는 현상이 발생하게 되며, 지상에서 비상동력계통 작동 점검이 정상적으로 이루어지지 않을 경우 더 이상 비행을 할 수 없기 때문에 해당 결함은 항공기 가동률 저하에 큰 원인이 된다. ECU에서 식별된 결함코드는 인버터 결함으로 판별되었으나 인버터 교체 이후에도 동일한 결함이 지속적으로 반복되었다. 본 논문은 인버터가 특정 시간 안에 전압을 생성시키지 못 할 경우 ECU에서는 결함으로 식별되는 것이 확인되었으며, 보조/비상동력계통의, BSG, ESC, 및 ECU의 응답특성을 분석하여 개선된 방법을 제시한다. 또한, 개선된 방법에 대한 검증을 통해 비상동력계통 출력 요구시간 범위 안에 인버터 출력이 정상적으로 생성되는 것을 확인하였으며, 이를 통해 비행전 지상에서 GEN TEST 수행 시 보조동력장치 자동 꺼짐 현상을 효과적으로 예방 할 수 있음을 확인 하였다.

A GEN TEST of the auxiliary power unit of a T-50 series aircraft is performed as part of the operational test of its emergency power system on the ground before flight. At this time, the auxiliary power unit should be automatically turned off via the response signal of the ECU when power is not normally supplied to the emergency power system. If the correct operation of the emergency power system cannot be confirmed on the ground, it is not possible to proceed with the flight. This kind of defect is a major factor causing the operation rate of the aircraft to be decreased. The defect code identified by the ECU was confirmed as a defect in the inverter. However, the same defect was found after replacing the inverter. This report presents an improved method of identifying the cause of the defect by analyzing the response characteristics of the ECU and emergency power system and allows the ECU to be recognized as the cause of the defect if the inverter does not generate a voltage within a certain time. Also, the application of the improved method confirmed that it can satisfy the output request time of the emergency power system and effectively prevent the auto-shutdown of the auxiliary power unit.

Keywords

References

  1. S. J. Park, S. W. Park, J. K. Suh, "Studies on the improvement of driving gears quality at Inlet Guide Vane of aircraft auxiliary power unit", J. of The Korean Society for Aeronautical and Space Sciences, Vol 44, no. 6, pp. 512-519, 2016. DOI: https://doi.org/10.5139/JKSAS.2016.44.6.512
  2. K. Y. Lee, S. W Lee, S. W. Kim. "Conceptual Design Procedure of APU and Market Trend", KSAS, vol. 24, no. 5, Oct. 1996.
  3. S. J. Park, "Effects of APU Noise in Employees on the Ramp", Journal of the Korea Academia-Industrial cooperation Society, vol. 17, no. 7, pp. 720-725, 2016. DOI: http://dx.doi.org/10.5762/KAIS.2016.17.7.720
  4. 85AEI-49-0105, "Functional Description/Installation/ Checkout, Auxiliary and Emergency Power System(A/EPS)", Korea Aerospace Industries, LTD, 2013.
  5. M. S. Kim, W. K. Ji, "The Usefulness of Hard Time Task for Weapon System in Considering Shape Parameter of Weibull Life Time Distribution and Maintenance Cost", Journal of the Korea Academia-Industrial cooperation Society, vol. 17, no. 1 pp. 274-283, 2016. DOI: http://doi.org/10.5762/KAIS.2016.17.1.274
  6. B. G. Song, G. H. Kim, Y. K. Kim, S. H. Park, J. G. Baek, "The research of Correspondence Analysis centered on the Failure Period to improve the reliability of Weapon Systems", Journal of the Korea Academia-Industrial cooperation Society, vol. 17, no. 10 pp. 289-299, 2016. DOI: http://dx.doi.org/10.5762/KAIS.2016.17.10.289
  7. S. J. Park, Y. W. Jang, S. H. Jeong, "Development of repair procedure for fuel tank access door of ultra-sonic aircraft", Journal of the Korea Management Engineers Society, vol. 21, no. 2, pp. 33-39, 2016.
  8. S. W. Park, "Introduction of Emergency Power System of T-50", Korea Aerospace Industries, LTD, pp. 105-106.
  9. S. W. Park, "Introduction of Secondary Power System of T-50", Korea Aerospace Industries, LTD, pp. 217-218.
  10. J. T. Jung, C. S. Kim, "A Study on Cost Optimization of Preventive Maintenance for the Second Driving Devices for Korea Train Express", Journal of the Korea Academia-Industrial cooperation Society, vol. 17, no. 2, pp. 1-7, 2016. DOI: http://doi.org/10.5762/KAIS.2016.17.2.1