Affiliation of Author(s):自动化学院
Journal:Trans. Nanjing Univ. Aero. Astro.
Abstract:Since the aerodynamic center moving backward sharply in hypersonic flight, the stability margin of the hypersonic vehicle increases largely while the maneuverability decreases. We proposed a novel method to solve this contradiction. We used relaxed static stability (RSS) to improve the maneuverability in hypersonic flight, and designed the stability augmentation system (SAS) to ensure the stability in subsonic flight. Therefore, the relationship between static stability and maneuverability was quantitatively analyzed in the first step, and the numerical value of RSS was obtained on the premise of good maneuverability. Secondly, the relationship between static stability and aerodynamic parameters was quantitatively analyzed. We properly adjusted aerodynamic parameters based on the quantitative relationship to achieve the specific static stability set in the first step, and therefore provided the engineering realization methods. The vehicle will be statically unstable in subsonic flight with the specific static stability. Lastly, SAS was needed to ensure the stability of the vehicle in subsonic flight. Simulation studies were conducted by comparing the linear SAS to the nonlinear SAS, and the results showed that the nonlinear dynamic-inversion controller can synthesize with proportional-integrall-derivative(PID) controller robustly and stabilize the hypersonic vehicle. © 2017, Editorial Department of Transactions of NUAA. All right reserved.
ISSN No.:1005-1120
Translation or Not:no
Date of Publication:2017-12-01
Co-author:Wu, Yushan,zzy,Jiao, Xin,Gu, Chenfeng
Correspondence Author:Jiang Ju
Date of Publication:2017-12-01