Frequency-domain System Identification of Tiltrotor Aircraft: Compared with CIFER

Electrical vertical takeoff and landing (eVTOL) aircrafts are undergoing rapid development. Aerodynamic modeling of eVTOL is vital for flight control system design, simulation, and handling quality assessment, but still a challenge due to unconventional hybrid aerodynamic layout and distributed electric propulsion. Without need of parametric model structure, the frequency-domain system identification method is more suitable for eVTOL aircraft flight dynamics identification. Since CIFER is embargoed, only old abridged student version can be obtained. This work seeks to provide a frequency-domain system identification software equivalent to CIFER. Flight data of XV-15 tiltrotor aircraft is adopted to verify the effectiveness of this software.