This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Stability of Highly Flexible Unmanned Aerial Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 10, 2009 by SAE International in United States
Annotation ability available
The objective of this paper is to address stability of Unmanned Aerial Vehicles (UAVs). The paper first derives the equations of motion for a generic UAV that account for both rigid-body and elastic degrees of freedom in coupled form, as well as nonlinear structural and unsteady aerodynamic effects. The equations are used to compute trim states for steady level flight at desired altitudes and speeds. Aircraft stability is addressed by linearizing the equations about the desired steady level flight, and solving the corresponding eigenvalue problem. The paper shows that other aircraft models widely used for addressing stability can be obtained from the “full model” as special cases. The five aircraft models considered in the paper are 1) full model, 2) linear model (the full model with a linear structural model), 2) nonlinear restrained aircraft model (full model with no rigid body degrees of freedom), 3) linear restrained aircraft model (the full model with no rigid body degrees of freedom, and with a linear structural model), 4) rigid aircraft model (the full model with no elastic degrees of freedom). The comparisons of these models are illustrated in a numerical example involving a high-altitude-long-endurance unmanned aerial vehicle.
CitationTuzcu, I., "Stability of Highly Flexible Unmanned Aerial Vehicles," SAE Technical Paper 2009-01-3167, 2009, https://doi.org/10.4271/2009-01-3167.
- Meirovitch L. and Tuzcu I., “Unified Theory for the Dynamics and Control of Maneuvering Flexible Aircraft,” AIAA Journal, Vol. 42, No. 4, 2004, pp. 714-727.
- Tuzcu I., “Dynamics and Control of Flexible Aircraft, Ph.D. Dissertation Virginia Polytechnic Institute and Sate University, Blacksburg, VA, December 2001.
- Tuzcu I., Marzocca P., Cestino E., Romeo G. and Frulla G., Stability and Control of a High-Altitude-Long-Endurance UAV, AIAA Journal of Guidance, Control, and Dynamics, Vol. 30, No. 3, May June 2007, 713-721.
- Tuzcu I., Marzocca P. and Awni K, “Nonlinear Dynamical Modeling of a High Altitude Long Endurance Unmanned Aerial Vehicle,” 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Palm Springs, CA, 4 - 7 May 2009.
- Patil M. J., Hodges D. H. and Cesnik C. E. S., “Nonlinear Aeroelasticity and Flight Dynamics of High-Altitude Long-Endurance Aircraft,” Journal of Aircraft, Vol. 38, No. 1, 2001, pp. 88-94.
- Patil M. J. and Hodges D. H., Flight Dynamics of Highly Flexible Flying Wings, Journal of Aircraft, Vol. 43, No. 6, 2006.
- Shearer C. M. and Cesnik C. E. S., Nonlinear Flight Dynamics of Very Flexible Aircraft, Journal of Aircraft, Vol. 44, No. 5, 2007.
- Nayfeh A. H. and Pai P. F., Linear and Nonlinear Structural Mechanics, John Wiley & Sons, Hoboken, New Jersey, 2004.
- Hodges D.H. and Pierce G.A., Introduction to Structural Dynamics and Aeroelasticity, Cambridge University Press, New York, 2002.
- Yates E.C., Modified-strip-analysis method for predicting wing flutter at subsonic to hypersonic speeds, Journal of Aircraft, 3 (1) (1966) 25-29.
- Tuzcu I., “On the Stability of Flexible Aircraft,” Aerospace Science and Technology, 12 (2008) 376-384.