State-Space Modeling and Identification of Delta Wing Vortex-Coupled Roll Dynamics

摘要

This paper develops a new state-space model for vortex-coupled 65-degree delta wing aircraft systems based on a modified nonlinear indicial response method combined with an internal state-space representation. Relationships between vortex breakdown location, rolling moment coefficient, and roll angle dynamics are determined. The state-space equations derived are subject to state delays and are also nonlinear in the vortex-coupled rolling moment coefficient. Linear and nonlinear parameter identification methods are developed to empirically estimate the rolling moment coefficient as a function of the roll angle and primary vortex breakdown locations. A comparison between numerical simulations and experimental data indicates close agreement for a number of different initial conditions.