Abstract
Although there have been many proposed methods to model unsteady aerodynamic effects in the stall and post-stall region, little work has been done to directly assess the impact of unsteady aerodynamic models on stability and control characteristics. In this paper, we combine the state-space method for unsteady aerodynamic modelling with bifurcation analysis to examine the sensitivity of stall and post-stall behaviour to the choice of aerodynamic modelling method: quasi-steady or unsteady. It is found that quasi-steady modelling can adequately capture the dynamics of the chosen example of a T-tailed transport aircraft with negligible wing-tail coupling. The study is then expanded to investigate a hypothetical situation with highly unsteady aerodynamic characteristics resembling a delta wing configuration – achieved by increasing the time delay constants in the unsteady model. This results in an aircraft with significantly lower flying qualities as indicated by bifurcation analysis. These findings highlight the need to implement unsteady aerodynamic modelling techniques in high-performance aircraft with significant vortex-related unsteady aerodynamics in order to sufficiently capture their stall and post-stall dynamics.
Original language | English |
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Pages (from-to) | 964-976 |
Number of pages | 13 |
Journal | Journal of Aircraft |
Volume | 59 |
Issue number | 4 |
Early online date | 2 Feb 2022 |
DOIs | |
Publication status | Published - Jul 2022 |
Bibliographical note
Funding Information:The first author is partially funded by the University of Bristol's Alumni Grant. The second author is funded by the EU H2020 SAFEMODE project (grant agreement ID: 814961). We are grateful to NASA Langley Research Center, specifically Kevin Cunningham and Gautam Shah, for providing the Generic T-tail Transport model aerodynamic data.
Funding Information:
The first author is partially funded by the University of Bristol’s Alumni Grant. The second author is funded by the EU H2020 SAFEMODE project (grant agreement ID: 814961). We are grateful to NASA Langley Research Center, specifically Kevin Cunningham and Gautam Shah, for providing the Generic T-tail Transport model aerodynamic data.
Publisher Copyright:
© 2021 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
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Extending Nonlinear Frequency Analysis to Flight Dynamics and Control Problems
Nguyen, D. H. (Author), Neild, S. (Supervisor) & Lowenberg, M. (Supervisor), 2 Dec 2021Student thesis: Doctoral Thesis › Doctor of Philosophy (PhD)
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