Identification of a nonlinear aerodynamic model of the F-14 aircraft

This effort identified a full subsonic flight envelope model of the aerodynamics of the F-14 aircraft. The data set consisted of 8.9 h of flight data stored as 983 separate maneuver files. The analysis used a unified system identification computer code implementing kinematic consistency, model structure determination, and parameter estimation functions. The code implements generalized filter error, encompassing both equation error and output error types of performance measures. The code can operate in a nearly automated manner, completely processing about 1 h of flight data in about 40 h of Unix workstation time. The resulting aerodynamic model represents nonlinear angle of attack, Mach number, and static flexibility effects. This model has 521 independent aerodynamic terms and 97 independent instrumentation terms. The identified model is an incremental model that adds to an existing nonlinear simulation. One and two dimensional spline functions represent the aerodynamic coefficients.

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