The Identification of MATHEMATICAL MODEL aerodynamic coefficients of AIRCRAFT LATERAL MOVEMENT

Abstract

The aim of this work is to develop improved methods of identifying the aerodynamic coefficients based on the synthesis of adaptive system, an adaptive algorithm aiming to identify and study the relations to identify and refine the aerodynamic parameters not maneuver lateral motion of the aircraft. The method combines the advantages of the known methods for the identification of the aerodynamic coefficients, which are presented in the public domain.The main problem lies in the fact that by traditional flight test aerodynamic coefficients are a set of discrete values. Linear model, which then is used does not describe accurately coefficients in flight, especially when changing parameters in a wide range of flight.The basic idea of the method consists in the following: synthesizing adaptive system that eliminates the inconsistency between the calculated values of the phase coordinates by which to identify and value, taken from the record flight tests. Simulation of changes in time of the phase coordinates is based on the results of other flight tests phase coordinates and mathematical model aircraft.After processing the records modified aircraft movement on the proposed algorithm we obtain the value of aerodynamic coefficients as a function of time for small changes in the parameters of flight and as a function of angle, angular velocity and deviation of steering for changing flight parameters in large range.The method of identification of the aerodynamic coefficients can fairly well determine the aerodynamic coefficients from flight test records: after identification increases the degree of real convergence of transient aircraft and its mathematical model. This method will improve the accuracy of identification of the aircraft motion parameters and therefore improve the quality of control.