Performance analysis of hypersonic vehicle based on aerodynamic derivatives

For air-breathing hypersonic vehicle, there exits significant aerodynamic/propulsion/structure couplings due to the integrated design, which requires detailed performance limitation analysis during the concept design phase. Aerodynamic derivatives are important parameters for hypersonic vehicle while open-loop performance affects the achievable closed-loop performance, there is mutual relationship between aerodynamic derivatives and the open-loop performance, the changes of aerodynamic derivatives under different flight conditions will directly affect the performance of the open loop. In this paper, the waverider model like X-43A is established and linearized, then aerodynamic derivatives will extract from the model state and control matrices, nine aerodynamic derivatives are considered in this paper. In addition, three kinds of open-loop performance are introduced including the deflection of elevator, the lag of path-attitude response, and the right half plane zero bandwidth constraints, which are obtained from aerodynamic derivatives. Finally, by analyzing them under different flight conditions, the best flight condition range is obtained.