Investigation on the Airworthiness of a Novel Tri-Rotor Configuration for a Fixed Wing VTOL Aircraft

Year 2023, Volume: 04 Issue: 02, 53 - 62, 30.12.2023

António Arco José Lobo Do Vale Sean Bazzocchi Afzal Suleman

Abstract

In this paper, a novel tri-rotor configuration is proposed with the goal of granting vertical take-off and landing capabilities to a new concept of tiltrotor, fixed-wing, aircraft while minimizing the overall mass of the propulsive system and the amount of aerodynamic drag developed during horizontal flight. The novelty of the presented configuration is related not only to the thrust vectoring capabilities of all three rotors but also to the constraints surrounding the action of the rear rotor, which will be required to provide thrust during both vertical and horizontal flight stages while drawing power from an internal combustion engine fixed inside the aircraft's fuselage. Another distinctive feature of the proposed configuration is related to the 20/80 thrust distribution which exists between the front and rear rotors respectively in vertical flight, unlike the more conventional approach of having all three rotors evenly loaded. The proposed configuration is then translated into a test vehicle which was subjected to several stages of ground and flight testing, with the ultimate goal of evaluating the airworthiness of the vehicle itself and of the configuration as a concept. This process also encompasses the development of a custom flight control firmware in PX4, required to operate not only this vehicle but also any other multi-rotor or Vertical Take-Off and Landing system with such configuration. Finally, a frequency-response based system identification technique is applied to the collected flight data as to obtain a suitable flight dynamics model for future autopilot tuning.

Keywords

Unmanned Aerial Vehicle, Vertical Take-Off and Landing, Tilt-rotor, Tri-rotor, System Identification

Supporting Institution

University of Victoria Center for Aerospace Research

Project Number

DNDPJ 503210 - 16

Thanks

We acknowledge the National Science and Research Council (NSERC) for the financial support for the NSERC-DND project no. DNDPJ 503210 - 16. Also, A.S. acknowledges the NSERC Canada Research Chair Program.

References

• Beard, R. W. And Mclain, T. W. (2012). Small Unmanned Aircraft: Theory And Practice (1st Ed.). Princeton, New Jersey: Princeton University Press.
• Bogdan, C. And Zoltan, K., (2017). Efficiency Investigation on A Helical Gear Transmission. Analele Universităţii “Eftimie Murgu” Reşiţa, Fascicola Inginerie, 24, 55-66.
• Goetzendorf-Grabowski, T., Tarnowski, A., Figat, M., Mieloszyk, J. & Hernik, B. (2020). Lightweight Unmanned Aerial Vehicle for Emergency Medical Service – Synthesis of The Layout. Proceedings Of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering, 1-17. DOI: 10.1177/0954410020910584.
• Gu, X., Xian, B. And Li, J. (2021). Model Free Adaptive Control Design for A Tilt Trirotor Unmanned Aerial Vehicle with Quaternion Feedback: Theory and Implementation. International Journal of Adaptative Control and Signal Processing, 36, 122-137. DOI: 10.1002/Acs.3344
• Mohamed, M. K. And Lanzon, A. (2012). Design and Control of Novel Tri-Rotor UAV. 2012 UKACC International Conference on Control, 304-309. DOI: 10.1109/CONTROL.2012.6334647
• Papachristos, C. And Tzes, A. (2012). Modeling And Control Simulation of An Unmanned Tilt Tri-Rotor Aerial Vehicle. 2012 IEEE International Conference on Industrial Technology, 840-845. DOI: 10.1109/ICIT.2012.6210043
• Pedro, S., Tomás, D., Lobo Do Vale, J. & Suleman, A. (2021). Design And Performance Quantification of VTOL Systems for A Canard Aircraft. The Aeronautical Journal, 98, 91-105. DOI: 10.1017/Aer.2021.63.
• Phillips, W.F. (2009) Mechanics of Flight (2nd Ed.). Hoboken, New Jersey: John Wiley & Sons, Inc.
• Roskam, J. (1998). Airplane Flight Dynamics and Automatic Flight Controls (2nd Ed.). Lawrence, Kansas: Design, Analysis and Research Corporation.
• Ruoho, S., Kolehmainen, J., Ikaheimo, J. & Arkkio, A. (2010). Interdependence Of Demagnetization, Loading, And Temperature Rise in A Permanent-Magnet Synchronous Motor. IEEE Transactions on Magnetics, 46(3), 949–953. DOI: 10.1109/TMAG.2009.2033592.
• Saeed, A. S., Younes, A. B., Cai, C. & Cai, G. (2018). A Survey of Hybrid Unmanned Aerial Vehicles. Progress In Aerospace Sciences, 1-24. DOI: 10.1016/J.Paerosci.2018.03.007.
• Salazar-Cruz S., Lozano R. & Escareño, J. (2009). Stabilization And Nonlinear Control for A Novel Trirotor Mini-Aircraft. Control Engineering Practice, 17, 886–894. DOI: 10.1016/J.Conengprac.2009.02.013
• Sekar, R. P., (2019). Determination Of Load Dependent Gear Loss Factor on Asymmetric Spur Gear. Mechanism And Machine Theory, 135, 322–335. DOI: 10.1016/J.Mechmachtheory.2019.02.011
• Tischler, M. B. & Remple, R. K. (2012). Aircraft And Rotorcraft System Identification (2nd Ed.). Reston, Virginia: American Institute of Aeronautics and Astronautics.
• Zhou, P., Lin, D., Xiao, Y., Lambert, N. & Rahman., M.A. (2012). Temperature-Dependent Demagnetization Model of Permanent Magnets for Finite Element Analysis. IEEE Transactions on Magnetics, 48(2), 1031–1034. DOI: 10.1109/TMAG.2011.2172395.