Hypersonic Flight Control Considering Parametric Variations And Vgi Effects

Despite advantages of variable geometry inlet (VGI) in improving scramjet efficiency, a concern of its negative effects on aerodynamics persists. This paper presents a novel longitudinal control for the hypersonic vehicle model with further considerations on both strong VGI effects and unpredictable parametric variations, which is practical but hard to handle. Our design uses an auxiliary signal and a bound adaptation mechanism to synthetically accommodate VGI effects (including VGI servomechanism characteristics and VGI couplings with aerodynamics), time-varying parameters and structural flexibility while achieving good tracking performances via a relatively low-dimension adaptive algorithm.