Satisfying stringent requirements for fine attitude control of hypersonic cruise vehicle (HCV)

Aim. The introduction of the full paper reviews a number of papers in the open literature and then outlines the research in this paper, which is explained in sections 1, 2 and 3. Taking the longitudinal channel of a HCV for example, section 1 analyzes the impact of elastic vibration on its flight control system. Section 2 establishes the elastic aerodynamic model of the HCV by giving eqs. (9) and (11). The core of section 3 consists of: (1) we reduce the fine attitude control of HCV to the fine control of the inlet local angle of attack (AOA) of a scramjet; (2) considering that body/engine coupling and aerodynamic heating cause the large-scale perturbation of the aerodynamic parameters and model parameters, we design the fine attitude control system by using the H∞ control theory, which is shown by the block diagram in Fig. 2; (3) we construct the generalized controlled object and solve the Riccati equation, thus obtaining the controller of the HCV; (4) we simulate the controller; the simulation results show preliminarily that: (a) with measurement noise, nonlinear actuator and large-scale perturbation of model parameters, the controller tracks the rigid AOA of HCV precisely and inhibits its flexible AOA well; (b) the ± 0.6 degree control precision of inlet local angle of attack is guaranteed, thus meeting the stringent requirements for fine attitude control of HCV.