Abstract
By using light-weighted material in hypersonic vehicle, the vehicle body can be easily deformed. The mutual couplings in aerodynamics, flexible structure, and propulsion system will bring great challenges for vehicle modeling. In this work, engineering estimated method is used to calculate the aerodynamic forces, moments, and flexible modes to get the physics-based model of an air-breathing flexible hypersonic vehicle. The model, which contains flexible effects and viscous effects, can capture the physical characteristics of high-speed flight. To overcome the analytical intractability of the model, a simplified control-oriented model of the hypersonic vehicle is presented with curve fitting approximations. The control-oriented model can not only reduce the complexity of the model, but also retain aero-flexible structure-propulsion interactions of the physics-based model and can be applied for nonlinear control.
Highlights
Hypersonic vehicle (HSV) which can travel faster than 5 times the speed of sound has wide range of applications in military and civilian areas
Bolender et al used a combination of oblique shock, Prandtl-Meyer expansion theory [5], and piston theory [6, 7] to calculate the aerodynamic forces and moments and conducted the first principles model (FPM) with X-43A vehicle geometry
The model is a nonlinear, physics-based model that can capture the couplings among the aerodynamics, flexible structural dynamics, and propulsion system
Summary
Hypersonic vehicle (HSV) which can travel faster than 5 times the speed of sound has wide range of applications in military and civilian areas. The high couplings among the aerodynamics, flexible structure, and propulsion system make the modeling and control of such vehicle very challenging [1]. The model is a nonlinear, physics-based model that can capture the couplings among the aerodynamics, flexible structural dynamics, and propulsion system. Extends the 3D flight dynamics analysis framework to include the effects of flexibility and unsteady aerodynamics Based on these models, several studies on the robust guidance and nonlinear control systems design have been published in recent years. For conducting a high-fidelity control-oriented model which can capture the inherent couplings of vehicle, we concentrate on the influence of flexible effects on the aerodynamic and propulsion system and present an airbreathing flexible HSV model by analyzing the physical characteristics of vehicle flight. The results show that the control-oriented model reduces the complexity of the physics-based model and is convenient for nonlinear control
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