Abstract
A methodology is described to couple unsteady aerodynamic loads with flexible bodies in multibody simulations. A representative civil jet aircraft aeroelastic model is used to evaluate the structural loads due to the combination of gust and ground loads. The implementation of unsteady aerodynamic loads is validated by comparing the results for the wing root bending moment and tip displacement with Nastran transient aeroelastic analyses for a series of gust lengths of a linear free–free aircraft model. The main objective of the paper is to prove that, with the implementation of a time domain formulation for the unsteady aerodynamic loads, a multibody simulation can be used to predict the aircraft aeroelastic loads that are comparable with traditional finite element-based methods. However, the use of a multibody simulation software offers the simulations to other maneuvers such as landings and the use of nonlinear and active structures.
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