Nonlinear Model of the Carried-based UCAV in Final-Approach

The model of the carrier-based UCAV is the basis for the design of the flight control system, which requires that its accuracy must conform to the design requirements. The nonlinear model of the carrier-based UCAV is difficult to get accurately. The aerodynamic layout of the carrier-based UCAV in this paper is used normal pneumatic layout design, with V wing and low-wing used small angle of sweepback and high aspect ratio. A complete nonlinear model is built through aerodynamic data fitting in this paper. It is necessary to model and simulate the control system of the aero-surfaces, on account of the V wing is controlled by the elevator and the rudder. The control system of the aero-surfaces is distinguished from the previous control system of the carrier aircraft, it is difficult to use the traditional trim method. A new trim method is established on the balance of aerodynamic force and torque. In the simulated of the carrier-based UCAV model, it's verified the accuracy by the responses to elevator and throttle step command. The model of the carrier-based UCAV provides an accurate model for the future simulation research which is established in this paper.