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Advances in Aircraft and Spacecraft Science
  Volume 7, Number 6, November 2020 , pages 553-570

Modeling and coupling characteristics for an airframe-propulsion-integrated hypersonic vehicle
Chengkun Lv, Juntao Chang, Yilei Dong, Jicheng Ma and Cheng Xu

    To address the problems caused by the strong coupling of an airbreathing hypersonic vehicle's airframe and propulsion to the integrated control system design, an integrated airframe–propulsion model is established, and the coupling characteristics between the aircraft and engine are analyzed. First, the airframe–propulsion integration model is established based on the typical nonlinear longitudinal dynamical model of an air-breathing hypersonic vehicle and the one-dimensional dual-mode scramjet model. Thrust, moment, angle of attack, altitude, and velocity are used as transfer variables between the aircraft model and the engine model. The one-dimensional scramjet model can accurately reflect the working state of the engine and provide data to support the coupling analysis. Second, owing to the static instability of the aircraft model, the linear quadratic regulator (LQR) controller of the aircraft is designed to ensure attitude stability and height tracking. Finally, the coupling relationship between the aircraft and the engine is revealed through simulation examples. The interaction between vehicle attitude and engine working condition is analyzed, and the influence of vehicle attitude on engine safety is considered. When the engine is in a critical working state, the attitude change of the aircraft will not affect the engine safety without considering coupling, whereas when coupling is considered, the attitude change of the aircraft may cause the engine unstart, which demonstrates the significance of considering coupling characteristics.
Key Words
    airframe-propulsion integration model; linear quadratic regulator; airframe-propulsion coupling characteristics; interaction between vehicle attitude and engine working condition
Chengkun Lv, Juntao Chang, Yilei Dong and Jicheng Ma: Harbin Institute of Technology, 150001 Heilongjiang, People's Republic of China

Cheng Xu: Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory, 100074 Beijing, People's Republic of China

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