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

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
권호 표지
DOI QR코드

DOI QR Code

Integrated Simulation of Descent Phase using the RCS jet for a Lunar Lander

RCS jet을 고려한 달착륙선의 Descent phase 통합 시뮬레이션

  • Min, Chan-Oh (Dept. of Aerospace Eng., Graduate School, Pusan Nat'l Unv.) ;
  • Jeong, Seun-Woo (Dept. of Aerospace Eng., Graduate School, Pusan Nat'l Unv.) ;
  • Lee, Dae-Woo (Dept. of Aerospace Eng., Pusan Nat'l Unv.) ;
  • Cho, Keum-Rae (Dept. of Aerospace Eng., Pusan Nat'l Unv.)
  • Received : 2012.09.08
  • Accepted : 2013.05.14
  • Published : 2013.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Researches for various lunar landing technologies are in progress for the lunar exploration program planned for early 2020s in Korea. This paper shows the integrated simulation for safe lunar landing guidance/control system in powered descent phase. Generally, the lunar lander uses on/off(bang-bang) controller to control the RCS jet thrusters instead of proportional controller. In this paper, the on/off controller using phase-plane switching function, and thruster selection algorithm to control sixteen thrusters are applied. Also additional guidance commands are calculated by a proposed fuzzy logic guidance algorithm. The simulation results show that lunar lander can follow a reference trajectory which is generated by optimization method, then land on the surface safely.

2020년 예정인 국내 달 탐사 프로그램을 위하여 달착륙선에 관한 다양한 연구가 진행되고 있다. 본 연구에서는 RCS jet을 고려한 달 착륙선의 Powered descent phase에서의 유도제어시스템을 구성하고 통합 시뮬레이션을 수행하였다. 달착륙선은 RCS 제트추력기를 이용하여 자세를 제어하므로 일반적인 비례제어기가 아닌 뱅뱅제어기를 사용하게 된다. 본 논문에서는 16개의 추력기를 이용하여 자세제어를 수행하고, 이를 위하여 phase-plane 스위칭 함수를 이용한 on/off 제어기와 추력기 선택 알고리즘을 적용하였다. 또한 Fuzzy logic을 이용한 유도 알고리즘을 이용하여 최적기법을 통해 생성된 기준경로에 따라 정확하고 안전하게 착륙 할 수 있음을 확인 하였다.

Keywords

References

  1. Epp, C., and Smith, T., "The Autonomous Precision Landing and Hazard Detection and Avoidance Technology (ALHAT)," Proc. of the Aerospace Conference, Big Sky, MT, March 2008, pp. 1-7.
  2. F. V. Bennett, T. G. Price, "Study of Powered-Descent Trajectories for Manned Lunar Landings", NASA Technical Note D-2426, Johnson Spacecraft Center Huston, Tex. August 1964.
  3. F. V. Bennett, "Apollo Experience Report-Mission Planning for Lunar Module Descent and Ascent", NASA Technical Note D-6846, Johnson Spacecraft Center Huston, Tex. June 1972.
  4. S.J. Jo, C.O. Min, D.W. Lee, K.R. Cho, "Optimal Trajectory Design of Descent/Ascent phase for a Lunar Lander With Considerable Sub-Phases", Journal of KSAS, Vol.38, No.12, pp. 1184-1194 https://doi.org/10.5139/JKSAS.2010.38.12.1184
  5. Robert F.Stengel, "Manual Attitude Control of the Lunar Module", Journal of Spacecraft and Rockets, Vol.7, No. 8, August 1970, pp. 941-948 https://doi.org/10.2514/3.30075
  6. Duda, K., Johnson, M., and Fill, T., "Design and analysis of lunar lander manual control modes," IEEE Aerospace Conference, March 2009
  7. H.C. Bang, M.J. Tahk, J.H. Kim, "Attitude Control for Flexible Spacecraft using Thrusters", Journal of KSAS, Vol.29, No.4, pp. 93-100
  8. Apollo Operations Handbook, NASA Report
  9. John D. Foley, "Control of a spacecraft using a reaction control system", Proceedings of the 20th Annual Summer Computer Simulation Conference, Seattle, 1988, pp. 236-240
  10. Agrawal, B.N. and Bang, H., "Robust Closed-loop Control Design for Spacecraft Slew Maneuver Using On-Off Thrusters", Journal of Guidance, Control, and Dynamics, Vol. 18, No. 6, 1995, pp. 1336-1349 https://doi.org/10.2514/3.21550
  11. C. A. Kluever, B. L. Peirson, "Optimal Low-Thrust Three-Dimensional Earth-Moon Trajectories", Journal of Guidance, Control, and Dynamics, Vol. 19, No. 4, July-August 1995, pp. 830-837.
  12. S.J. Jo, C.O. Min, D.W. Lee, K.R. Cho, "Control of powered descent phase for a Lunar Lander using PID controller", Journal of KSAS, Vol.39, No.5, pp. 408-415 https://doi.org/10.5139/JKSAS.2011.39.5.408
  13. Rao, A.V., "User's Manual for GPOPS Version 1.0", Gainesville, FL32607, 2007, pp.1-60
  14. C.O. Min, S.J. Jo, D.W. Lee, "Trajectory Planning and Fuzzy Controller Design of a Re-entry vehicle on Approach and Landing phase", Journal of KSAS, Vol.38, No.2, pp. 150-159 https://doi.org/10.5139/JKSAS.2010.38.2.150
  15. Epp, C.D., Robertson, E.A., Brady, T., "Autonomous Landing and Hazard Avoidance Technology (ALHAT)", IEEE, 2008.