An application of nonlinear model reduction for a full-scale passenger aircraft, exhibiting geometric structural nonlinearity, is presented. The model reduction approach is based on eigenmode decomposition about the coupled aeroelastic system's reference equilibrium point combined with a projection of the expanded full-order nonlinear residual function. Efforts are made to establish a structured approach to identify the dominant modes required to construct an accurate reduced-order model for such nonlinear aeroelastic system. Time-domain results for gust response analysis are then presented to study the effect of structural nonlinearities and to compare the reduced model against the full-order simulation. Results show both the linear and nonlinear reduced-order models are capable of accurately predicting the dynamic gust response of aircraft structures while achieving significant reduction in system size.
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