한국추진공학회지 (Journal of the Korean Society of Propulsion Engineers)

  • 제27권2호
  • /
  • Pages.38-44
  • /
  • 2023
  • /
  • 1226-6027(pISSN)
  • /
  • 2288-4548(eISSN)
한국추진공학회 (The Korean Society of Propulsion Engineers)
권호 표지
DOI QR코드

DOI QR Code

한국형발사체 75톤급 액체로켓엔진 추력제어시스템의 안정성 평가

Stability Evaluation for the Thrust Control System of KSLV-II 75-tonf Liquid Rocket Engine

  • Taekyu Jung (Space Propulsion Research Division, Korea Aerospace Research Institute)
  • 투고 : 2022.12.01
  • 심사 : 2023.02.15
  • 발행 : 2023.04.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 누리호 75톤급 엔진 추력제어시스템의 수학적 모델을 제시하였고 안정성을 평가하였다. 추력제어밸브의 최대 구동 속도인 28.4 deg/s에서 dead band(ΔP)가 0.06 bar일 때, 진폭은 0.095 bar, 주파수는 1.43 Hz인 오토오실레이션이 발생하였다. 상기 조건보다 밸브 구동 속도를 느리게 하거나, dead band를 크게 하면 오토오실레이션을 방지할 수 있음을 해석을 통해 확인하였다.

In this paper, mathematical models for the thrust control system of KSLV-II 75-tonf liquid rocket engine are introduced. Also the stability of the thrust control system is evaluated. An auto oscillation breaks out under the condition of dead band(ΔP), 0.06 bar and the maximum driving speed, 28.4 deg/s of a thrust control valve. The amplitude and frequency of the auto oscillation are each 0.095 bar and 1.43 Hz. It is proved by simulations that the auto oscillation can be avoided under the slower valve driving speed or the higher dead band than the above conditions.

키워드

참고문헌

  1. Jung, T. and Lee, S. "Development of BLDC Motor Driven Cryogenic Thrust Control Valve for Liquid Propellant Rocket Engine," The Korean Society for Aerospace and Space Sciences, Vol. 38, No. 10, pp. 1026-1030, 2010.  https://doi.org/10.5139/JKSAS.2010.38.10.1026
  2. Jung, T. and Han, S., "Cryogenic Throttle Valve Driven by BLDC Motor for Thrust Control of a Liquid Rocket Engine," 3rd International Conference on Mechanical Engineering and Mechatronics, Prague, Czech Republic, Paper No. 67, August, 2014. 
  3. Kim, Dmitri P. Automatic Control II, Nonlinear System and Multi-variable System Theory, Publisher Han-ol, 2001. 
  4. Jung, T. and Lee, S. "A Study on Control Algorithm of Thrust Control Valve for a Liquid Rocket Engine," The Korean Society for Aerospace and Space Sciences, Vol. 40, No. 12, pp. 1055-1062, 2012.  https://doi.org/10.5139/JKSAS.2012.40.12.1055
  5. Jung, T., Han, S. and Lee, S. Y., "Design and Performance Evaluation of a Pressure Pulsator for Measurement of Dynamic Characteristics of Liquid Rocket Engine," 2013 KSPE Fall Conference, Gyeongju, Korea, pp. 61-67, 2013. 
  6. Jung, T. and Lee, S.Y., "A Numerical Study on Pressure Pulsator for Measurement of Dynamic Characteristics of Liquid Rocket Engine," Proceedings of Autumn Conference of Korean Society for Aerospace and Space Science, Korea, pp. 2286-2290, 2012. 
  7. Shnyakin, V., Kovalenko, V., Konokh, A. and Zhivotov, A., "Investigation of Characteristics of the Vega LV Fourth Stage Main Engine Assembly: Low-Frequency Oscillations Stability, Lateral Disturbances at Startup," 60th International Astronautical Congress, IAC-09-C4.1.7, 2009. 
  8. Jung, T., "Development and Evaluation of Startup Simulation Code for an Open Cycle Liquid Rocket Engine," Journal of the Korean Society of Propulsion Engineers, Vol. 23, No. 5, pp. 67-74, 2019.  https://doi.org/10.6108/KSPE.2019.23.5.067
  9. Jung, T., "Transient Mathematical Modeling and Simulation for an Open Cycle Liquid Rocket Engine," Asia-Pacific International Symposium on Aerospace Technology, Jeju, Korea, pp. 1343-1360, Sep. 2021. 
  10. Levy, E.C., "Complex-curve fitting," IRE Trans. Automatic Control, Vol. AC-4, pp. 37-43, 1959.  https://doi.org/10.1109/TAC.1959.6429401
  11. Kidd, J.B., Edgerton, T.E. and Chen, C.F., "Transfer Function Synthesis in the Time Domain-An Extension of Levy's Method," IEEE Transactions on Education, Vol. 8, No. 2, pp. 62-67, 1965. https://doi.org/10.1109/TE.1965.4321898