Calculation of Aircraft Aerodynamic Loads During Operational Flight

In this research, the calculation method of aerodynamic loads on an airplane in all flight situations is presented. In order to find an calculation equation for aerodynamic loads on an airplane in all flight conditions, the F-5 aircraft is selected as a prototype is divided into one hundred small parts longitudinally. Therefore, the numerical solutions are taken place in different conditions of Mach number, angle of attack, control surfaces changes, etc., which are the effective parameters. aerodynamic loads on each part is calvulated. Using least squares method, an equation for calculating applied aerodynamic loads on each part is determined. In order to find the variables used in mentioned equations above, an aircraft flight simulation is implemented. The results of flight simulation are validated by flight tests information. Finally, loop maneuver is perform using this simulator and the variables used in aerodynamic loads are recorded, while this maneuver is performed. Then, the aerodynamic loads applied on different parts during loop maneuver are calculated.The results show that the present method is suitable for airplane aerodynamic loads calculations.