Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Design and Performance Verification of L1 Adaptive Flight Control Law Considering the Change of Center of Gravity for Unmanned Tailless Aircraft

무인 무미익 항공기의 무게중심 변화를 고려한 L1 적응제어 비행제어 법칙 설계 및 성능 검증

  • Ko, Dong-hyeon (Department of Aerospace Engineering, Inha University) ;
  • Kang, Ji-soo (Department of Aerospace Engineering, Inha University) ;
  • Choi, Keeyoung (Department of Aerospace Engineering, Inha University)
  • Received : 2018.10.10
  • Accepted : 2019.01.19
  • Published : 2019.02.01
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Abstract

Tailless aircraft have advantages of low visibility compared to conventional aircraft, but drawback of poor stability as well which makes designing controller difficult. The controller design is more difficult, especially when the center of gravity moves due to store release or fuel consumption during flight. In this paper, an L1 adaptive controller is proposed as a way to overcome these problems. The reliability and performance of the controllers were verified by non-linear simulations. RPV Flying Quality Design criteria were used for design criteria. Using the simulation, it is shown that the adaptive controller maintains stability of the unmanned aircraft for sudden large change in the inertial properties. It is also shown that the calculation burden can be reduced when it is used with the gain scheduling method.

무미익 항공기는 꼬리 날개가 없기 때문에 일반적인 형태의 항공기에 비해 피탐성 낮으나 안정성이 좋지 않아 제어기를 설계하는 것이 쉽지 않다. 특히 비행 중에 임무장비 투하나 연료 소모 등에 의해 무게중심의 위치가 변화하는 것을 고려한다면 제어기 설계는 더욱 더 어렵게 된다. 본 논문에서는 이러한 문제점을 극복하기 위한 방법으로 L1 적응제어 방식을 제안하며 비선형 시뮬레이션을 통하여 제어기의 안정성과 성능을 검증하였다. 설계지표 선정을 위해 RPV Flying Quality Design criteria의 내용을 참고하였다. 시뮬레이션을 이용하여 급격한 관성량의 변화에 대해 설계된 적응제억기가 무미익 항공기 안정성을 유지하는 것을 보이고, 이득 스케쥴링 기법과 함께 사용 시 계산량이 줄어들 수 있음을 확인하였다.

Keywords

References

  1. Ha, C. K., and Yoon, S. J., "The latest trend in development technology of Tailless Uninhabited Aerial Vehicle," Journal of Institute of Control, Robotics and Systems, September 2001, Vol. 7, No. 5, pp. 19-27.
  2. https://www.defensenews.com/home/2016/07/08/neuron-combat-drone-completes-first-sea-trials
  3. https://en.wikipedia.org/wiki/BAE_Systems_Taranis
  4. https://www.popsci.com/china-sharp-sword-lijian-stealth-drone
  5. https://en.wikipedia.org/wiki/Mikoyan_Skat
  6. Yoon, S. H, Lee, H. T., and Shim, H. C., "Improving the Stability and Maneuverability of Small Tailless BWB Unmanned Aircraft," Proceeding of The Korean Society for Aeronautical and Space Sciences Spring Conference, April 2011, pp. 732-737.
  7. Wise, K. A., Brinker, J. S., Calise, A. J., Enns, D. F., Elgersma, M. R., and Voulgaris, P., "Direct adaptive reconfigurable flight control for a tailless advanced fighter aircraft," International Journal of Robust and Nonlinear Control, Vol. 9, No. 14, 1999, pp. 999-1012. https://doi.org/10.1002/(SICI)1099-1239(19991215)9:14<999::AID-RNC449>3.0.CO;2-O
  8. Patel, V. V., Cao, C., Hovakimyan, N., Wise, K. A., and Lavretsky, E., "${\mathsc{L}}$1 adaptive controller for tailless unstable aircraft in the presence of unknown actuator failures," International Journal of Control, Vol. 82, No. 4, 2009, pp. 705-720. https://doi.org/10.1080/00207170802225955
  9. Chung, J. W., Jun, Y. D., You, D. I., and Shim, H. C., "A Flight Control System Design For Stealth Unmanned Combat Aerial Vehicle," Proceeding of The Korean Society for Aeronautical and Space Sciences Spring Conference, April 2014, pp. 605-608.
  10. Cao, C., et al., "Stabilization of cascaded systems via L1 adaptive controller with application to a UAV path following problem and flight test results," American Control Conference, July 2007, pp. 1787-1792.
  11. AFFDL-TR-76-125, "RPV FLYING QUALITIES DESIGN CRITERIA," 1976.
  12. Cao, C., and Hovakimyan, N., "Design and analysis of a novel l1 adaptive controller, part i: control signal and asymptotic stability," American Control Conference, July 2006, pp. 3397-3402.
  13. Stevens, B. L., and Lewis, F. L., Aircraft Control and Simulation, 2nd Edition, John Wiley & Sons, 2003.
  14. Hovakimyan, N., and Cao, C., L1 Adaptive control theory: Guaranteed robustness with fast adaptation SIAM, 2010.
  15. Larchev, G. V., Stefan, C. F., and Kaneshige, J. T., "Projection Operator: A Step Toward Certification of Adaptive Controllers," AIAA Infotech@ Aerospace, April 2010, pp. 3366.
  16. Cho, S. O., "A Study on UAV system equipped with robotic arms for operation," Ph. D. Dissertation, 2013 In-ha University.
  17. Kim, C. S., "A Study on Aircraft Sensitivity Analysis for CG Variation of Longitudinal Axis," Journal of The Korean Society for Aeronautical and Space Science, Vol. 34, No. 6, 2006, pp. 83-91. https://doi.org/10.5139/JKSAS.2006.34.6.083