Moti Karpe, Aviv Romm, Manuel Reyes, Hector Climent
DOI Number: N/A
Conference number: IFASD-2015-183
The related Dynresp aeroservoelastic simulation framework are expanded to include general frequency-domain sensors and generalized force feedback. The expansion facilitates efficient applications to nonlinear gust-response simulations of flight vehicles while changing their wing sweep angle, the structural coupling between components and with flight mechanic effects that are normally not taken into account in common dynamic loads analyses. The new general sensors are employed to express current generalized unsteady aerodynamic forces as response parameters during the simulations. The responses are combined for time-domain response surfaces using Inverse Fast Fourier Transforms. Interpolations in the response surfaces according to the prescribed sweep-angle variation allow gust response simulations while the wing sweep angle is changing, causing continuous changes in the aerodynamic panel model. A modal coupling technique that is based on interface fictitious masses is used for defining the interface forces that satisfy the displacement compatibility constraints while accounting for the relative rotations between structural components. The forces are applied in terms of time-domain changes in the generalized mass matrix. The feedback force capabilities are used also for introducing flight-mechanic forces, such as induced drag, gravity effects and changes in local velocities due to yaw. The new capabilities are demonstrated in two test cases: (a) dynamic response of an aircraft to discrete gust during changes in the wing sweep angle; and (b) dynamic response of a transport aircraft to continuous turbulence and maneuver commands with rigid-body flight mechanic effects.