Nonlinear Static Aeroelasticity of High-Aspect-Ratio-Wing Aircraft by Finite Element and Multibody Methods

Abstract

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Flight Loads Prediction of High Aspect Ratio Wing Aircraft Using Multibody Dynamics

“…The lateral force component arising from the follower force effect is contributing as well to the bending moment; nevertheless this contribution is not high enough to compensate for the moment arm shortening and lift redistribution. This result is the opposite of what has been obtained by Castellani et al [12] on a very flexible high aspect ratio unswept wing, where, due to the extreme bending, the lateral lift component acting outof-plane overcomes the bending moment reduction caused by the wing tip shortening and leads to higher bending moment predicted by the nonlinear analysis.…”

“…In the multibody approach, the trim solution is sought by performing a dynamic settling simulation with the implementation of controllers in order to achieve a steady trimmed state. Details of the trim methodology developed are provided by Castellani et al [12].…”

“…However, less focus has instead been devoted to the use of multibody simulation for the modelling of high aspect ratio wings, the two most relevant pieces of work being those presented by Krüger [7] and Zhao and Ren [9]. Recently, Castellani et al [12] developed two nonlinear methodologies, based, respectively, on nonlinear Finite Element Method (FEM) and multibody dynamics, for the static aeroelastic trim analyses including structural nonlinearities and applied these to a very flexible High-Altitude Long Endurance Unmanned Aerial Vehicle test case.…”

Effects of Geometric Nonlinearities on the Fidelity of Aeroelasticity Loads Analyses of Very Flexible Airframes

“…The effects of geometrical nonlinearities on the aeroelastic loads of aircraft in static flight conditions has been studied quite thoroughly by several authors [9], [59], [77], [78].…”

“…Ribiero used the strain based beam model, developed originally by Brown and Shearer [31], [82], to create a fully nonlinear aeroelastic solver, namely, AeroFlex [59]. More recently, Castellani et al [9] used MSC Nastran [36] to create an ad-hoc nonlinear static aeroelastic solver [9], [77], which was improved upon by the author, detailed in the previous section [1].…”