TY - GEN
T1 - Stability Margin Evaluation of DI Control System for Suborbital Spaceplane During Re-entry Phase
AU - Watanabe, Tomotaka
AU - Yonemoto, Koichi
AU - Fujikawa, Takahiro
AU - Matsukami, Takahiro
N1 - Publisher Copyright:
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
PY - 2024
Y1 - 2024
N2 - This paper reports the application of DI (Dynamic Inversion) theory, a nonlinear control theory, to suborbital spaceplanes. The effectiveness of the control law based on the DI theory for suborbital spaceplane FuJin, which is underdeveloped by mainly SPACE WALKER Inc. is confirmed by conducting numerical simulations of the longitudinal system for the re-entry phase. In addition, evaluate the stability margin, which is issue when applying the DI theory. In addition to the positive stability margin, it is revealed that there is the negative stability margin. Furthermore, a parametric analysis of the state variables is conducted to clarify the dependence of the stability margin on the state variables. It is found that positive stability margin is less dependent on the quantity of states variables, while negative stability margin is highly dependent on altitude, angle of attack and elevator deflection angle. In the longitudinal system, negative stability margin is not issue, and since positive stability margin also has no large fluctuation, it is possible to secure the stability margin by tuning the gain. In the future, this analysis will be extended to lateral and directional systems, and evaluation will be conducted in phases other than the re-entry phase.
AB - This paper reports the application of DI (Dynamic Inversion) theory, a nonlinear control theory, to suborbital spaceplanes. The effectiveness of the control law based on the DI theory for suborbital spaceplane FuJin, which is underdeveloped by mainly SPACE WALKER Inc. is confirmed by conducting numerical simulations of the longitudinal system for the re-entry phase. In addition, evaluate the stability margin, which is issue when applying the DI theory. In addition to the positive stability margin, it is revealed that there is the negative stability margin. Furthermore, a parametric analysis of the state variables is conducted to clarify the dependence of the stability margin on the state variables. It is found that positive stability margin is less dependent on the quantity of states variables, while negative stability margin is highly dependent on altitude, angle of attack and elevator deflection angle. In the longitudinal system, negative stability margin is not issue, and since positive stability margin also has no large fluctuation, it is possible to secure the stability margin by tuning the gain. In the future, this analysis will be extended to lateral and directional systems, and evaluation will be conducted in phases other than the re-entry phase.
KW - Dynamic Inversion
KW - Negative Gain Margin
KW - Stability Margin
KW - Suborbital Spaceplane
UR - http://www.scopus.com/inward/record.url?scp=85200494980&partnerID=8YFLogxK
U2 - 10.1007/978-981-97-4010-9_83
DO - 10.1007/978-981-97-4010-9_83
M3 - Conference contribution
AN - SCOPUS:85200494980
SN - 9789819740093
T3 - Lecture Notes in Electrical Engineering
SP - 1073
EP - 1083
BT - 2023 Asia-Pacific International Symposium on Aerospace Technology, APISAT 2023, Proceedings - Volume II
A2 - Fu, Song
PB - Springer Science and Business Media Deutschland GmbH
T2 - Asia-Pacific International Symposium on Aerospace Technology, APISAT 2023
Y2 - 16 October 2023 through 18 October 2023
ER -