Numerical Aspects of Nonlinear Flexible Aircraft Flight Dynamics Modeling

craft dynamics modeling is presented. The baseline model is a geometricallyexact composite beam model describing the exible-body dynamics which are subject to aerodynamic forces predicted using the unsteady vortexlattice method (UVLM). The objectivity of the beam formulation is rst investigated for static problems with large nodal rotations. It is found that errors associated with non-objectivity of the formulation are minimized to negligible levels using quadratic (3-noded) elements. In addition to this, two force calculation methods are presented and compared for the UVLM. They show subtle but important dierences when applied to unsteady aero

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