An efficient method for nonlinear aeroelasticy of slender wings |
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Authors: | S?Shams M?H?Sadr Email author" target="_blank">H?HaddadpourEmail author |
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Institution: | 1.Department of Aerospace Engineering,Amirkabir University of Technology,Tehran,Iran;2.Department of Aerospace Engineering,Sharif University of Technology,Tehran,Iran |
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Abstract: | This paper aims the nonlinear aeroelastic analysis of slender wings using a nonlinear structural model coupled with the linear
unsteady aerodynamic model. High aspect ratio and flexibility are the specific characteristic of this type of wings. Wing
flexibility, coupled with long wingspan can lead to large deflections during normal flight operation of an aircraft; therefore,
a wing in vertical/forward-afterward/torsional motion using a third-order form of nonlinear general flexible Euler–Bernoulli
beam equations is used for structural modeling. Unsteady linear aerodynamic strip theory based on the Wagner function is used
for determination of aerodynamic loading on the wing. Combining these two types of formulation yields nonlinear integro-differentials
aeroelastic equations. Using the Galerkin’s method and a mode summation technique, the governing equations will be solved
by introducing a numerical method without the need to adding any aerodynamic state space variables and the corresponding equations
related to these variables of the problem. The obtained equations are solved to predict the aeroelastic response of the problem.
The obtained results for a test case are compared with those of some other works and show a good agreement between results. |
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