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FE-Modal Approach to Model Geometric Nonlinearities of High Aspect Ratio Wing

Geometrical nonlinearity of high aspect ratio wing arises from the tip deflection which has been modeled through combined FE/modal approach. Generalized aerodynamics forces are obtained through commercial aeroelastic package. In time domain modeling, reduced frequency dependency of the aerodynamics need to be accounted. For state space time domain models this can be done through rational fraction approximation (RFA) of aerodynamics. Karpels minimum state approximation has been used in this work. Linear and nonlinear aeroservoelastic analyses of a high aspect ratio wing have been presented. Only stability and flutter issues are considered in this work while no external input has been considered.