Ilias Tsatsas
Aeroelastic damping estimation for a flexible high-aspect-ratio wing
Tsatsas, Ilias; Pontillo, Alessandro; Lone, Mudassir
Authors
Abstract
Estimation of aeroelastic damping for a very flexible high-aspect-ratio wing using wind-tunnel test data is presented in this work through the comparison of four different methods: half-power, half-quadratic gain, an adapted version of random decrement, and the least-square complex exponential method. A model with an aspect ratio of 18.8 was tested in the Cranfield 2.4×1.8-m (8×6-ft) low-speed wind tunnel across a Reynolds number range of 2.33×105-4.66×105 and dynamically excited using the step relaxation technique. Analysis of the results provides a view of the benefits and limitations of each method, which were seen to differ between 3% and 25% relative to the half-power for the dominant first mode. The trends in predicted damping show clear dependency on freestream velocity. Structural damping of the first mode was also obtained using ground vibration test data to separate the aerodynamic and structural contributions to the overall aeroelastic damping. Structural damping was found to be around 5% and the aerodynamic component was found to add approximately 7.5% at one specific test condition. Although the half-power method is widely used in the community for calculating structural damping, this work shows that when aeroelastic damping is higher than 5%, the other three examined methods yield more consistent results.
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 21, 2021 |
Online Publication Date | Dec 21, 2021 |
Publication Date | Mar 31, 2022 |
Deposit Date | Apr 22, 2024 |
Journal | Journal of Aerospace Engineering |
Print ISSN | 0893-1321 |
Electronic ISSN | 1943-5525 |
Publisher | American Society of Civil Engineers |
Peer Reviewed | Peer Reviewed |
Volume | 35 |
Issue | 2 |
DOI | https://doi.org/10.1061/%28ASCE%29AS.1943-5525.0001390 |
Public URL | https://uwe-repository.worktribe.com/output/11886321 |
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