High-altitude long-endurance (HALE) air vehicles have differentrequirements compared with classical air vehicles. They require lighterstructures and higher wing aspect ratio that result in very flexible structureswith significant nonlinear geometry effects that are usually not taken intoaccount in aircraft structural design. The present work describes a way tosimulate the dynamic response of aeroservoelastic systems with highlyflexible structure, based on the Ansys finite-element (FE) commercialsoftware package. Unsteady aerodynamics are based on 2D modified-striptheory and nonlinear effects are integrated using APDL (Ansys ParametricDesign Language). The response to gust with large displacements is analyzedusing a symmetric airplane model. This work presents the potential of thisnew tool for preliminary design of very flexible airborne structures, withoutthe need of additional software. The method can be programed into othercommercial FE software packages, according with their specific codelanguages.
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