A framework based on multibody dynamics has been developed for the static and dynamic aeroelastic analyses of flexible high\naspect ratio wing aircraft subject to structural geometric nonlinearities. Multibody dynamics allows kinematic nonlinearities\nand nonlinear relationships in the forces definition and is an efficient and promising methodology to model high aspect ratio\nwings, which are known to be prone to structural nonlinear effects because of the high deflections in flight. The multibody\ndynamics framework developed employs quasi-steady aerodynamics strip theory and discretizes the wing as a series of rigid bodies\ninterconnected by beam elements, representative of the stiffness distribution, which can undergo arbitrarily large displacements\nand rotations. The method is applied to a flexible high aspect ratio wing commercial aircraft and both trim and gust response\nanalyses are performed in order to calculate flight loads. These results are then compared to those obtained with the standard linear\naeroelastic approach provided by the Finite Element Solver Nastran. Nonlinear effects come into play mainly because of the need\nof taking into account the large deflections of the wing for flight loads computation and of considering the aerodynamic forces as\nfollower forces.
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