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Session: Poster session & drinks
Session starts: Tuesday 18 June, 18:00
Presentation starts: 18:17
Room: Room 1.1

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Fahed Mohd (University of Nottingham, UK)
Mohammadreza Amoozgar (University of Nottingham, UK)
Stewart McWilliams (University of Nottingham, UK)

Abstract:
High Aspect ratio Wings (HARW) are nowadays being used in the commercial aerospace industry due to their high lift-to-drag ratios and longer flight ranges. This is because aerodynamic-induced drag is reduced by increasing the aspect ratio of the wing, thereby resulting in more economical flight operations [1]. However, owing to these aerodynamic advantages, there are structural design constraints such as higher stress concentration on the wing root, and higher structural flexibility which causes the wing to be more prone to larger deflections, which in turn affect the overall aeroelastic behaviour [1]. To eliminate these downsides, Strut-Braced High Aspect Ratio Wings (SB-HARW) were proposed which may be proved to be more advantageous than the traditional wings [2]. Nonetheless, large deflections of SB-HARW can have structural nonlinearities associated with them, which can significantly alter the aeroelastic stability and response [3]. In, addition to accurately capturing their structural dynamics, their aeroelastic behaviours such as flutter instability onset, post-flutter response, etc. must be considered as well [4]. The studies related to assessing the post-flutter nonlinear aeroelastic behaviour of SB-HARW are very limited thus hindering its practical implementation in the commercial aviation industry. Therefore, this paper aims to study the nonlinear aeroelastic response of SB-HARW in the post-instability region considering various wing and strut nonlinearities. The SB-HARW is modelled as a cantilever nonlinear beam while the strut is modelled using a nonlinear spring connected between the wing and fuselage. The final paper will present the methodologies used for the analysis in more detail alongside with the verifications of the developed aeroelastic model. The objective will be to investigate the effect of strut spanwise location, chordwise offset, number of struts and strut stiffness nonlinearity on the flutter instability and post-instability behaviour of a wing with cubic nonlinearity. References [1] Afonso, Frederico, et al. "A review on non-linear aeroelasticity of high aspect-ratio wings." Progress in Aerospace Sciences 89 (2017): 40-57. [2] Sohst, Martin, et al. "Optimization and comparison of strut-braced and high aspect ratio wing aircraft configurations including flutter analysis with geometric non-linearities." Aerospace Science and Technology 124 (2022): 107531. [3] Patil, M. J., & Hodges, D. H. (2004). On the importance of aerodynamic and structural geometrical nonlinearities in aeroelastic behavior of high-aspect-ratio wings. Journal of Fluids and Structures, 19(7), 905-915. [4] Liu, Y., Xie, C., Yang, C., & Cheng, J. (2016). Gust response analysis and wind tunnel test for a high-aspect ratio wing. Chinese Journal of Aeronautics, 29(1), 91-103.