A control-oriented modeling for flexible air-breathing hypersonic vehicle

The wide use of lifting body and wave-rider aerodynamic layout causes difficulty in the coupling between the rigid modal of a flexible air-breathing hypersonic vehicle and its elastic modal. Hence we use the finite element method and the variable cross-section free beam to establish the control-oriented structural elastic model of the hypersonic vehicle. We apply the first-order local flow piston theory to calculate its unsteady aerodynamic force. Then we use the uniform design method and the step-by-step regression analysis method to establish its high-precision curve fitting model (CFM). The simulation results, given in Figs.3 and 4, and their comparison show preliminarily that: the CFM established with the control-oriented elastic modeling method agrees well with the physical model of the hypersonic vehicle, while consuming less computing time and resources than other traditional modeling methods.