Development of the flight dynamics model (FDM) for coaxial rotary-wing UAV simulation

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The main objective of the proposed research project is the development of the FDM and flight simulation forAirvinci's rotorcraft. It consists of the three main components: The first component is the development of FDMfor rotor motions. Wind tunnel and flight tests are beyond the scope of this project. For this reason, this projectwill employ the numerical methods such as the blade-element formulation, Pitt-Peters dynamics inflow model,and powertrain model. These methods are generally utilized to develop the rotorcraft FDM. The blade-elementformulation subdivides each rotor into segments, and the local airspeed and angle of attack are determined foreach element. Then these results are used to determine the aerodynamic forces of the main rotor. ThePitt-Peters dynamic inflow model will determine the total airflow of the rotorcraft and the powertrain modelwith engine dynamics model will determine the rotor rotational speed. The second component is thedevelopment of FDM for the fuselage and control surfaces. The rigid-body 6 Degree-of-Freedom (DOF)equations and aerodynamics models will be employed to develop the dynamic model of the fuselage andcontrol surfaces. The Center of Gravity (CG) location will be derived from the geometry and materials.Aerodynamics forces and moments for the fuselage and control surfaces will be determined from numericalequations. The third component is the implementation of mathematical models of the rotorcraft into JSBSim.The FDM is then combined with FlightGear to develop the dedicated simulation of the Airvinci's rotorcraft andits performance over a range of environments. The development of visual simulation entails 3D models of therotorcraft to be used with Blender (www.blender.org) which is an open source 3D modeling software. Blenderis compatible with FlightGear and it can import and export various types of 3D models. The developed FDMwill be updated from the feedback of the flight test on the developed simulation.