Aeroelastic response of 2-D lifting surfaces to gust and arbitrary explosive loading signatures

The aeroelastic response to time-dependent external excitation of a two-dimensional rigid/elastic-lifting surface in incompressible flow field featuring plunging – pitching coupled motion is addressed in this paper. The expressions of the unsteady aerodynamic lift and moment in the time domain are given in terms of the Wagnerʹs function, while the gust loads are given in terms of the Küssnerʹs function. Numerical simulations of the aeroelastic response to gust and blast pressure signatures and comparisons with the solution obtained for an airfoil featuring plunging motion alone, are supplied. The concepts of the alleviation factor envelope and of the one- and two-degrees-of-freedom rigid/elastic-lifting surfaces, considered in conjunction with the aeroelastic response, are investigated and pertinent conclusions are outlined.