f(t) [N] Wing, mass [eu] N + 2 + -6 6 -10 -5 10 Simulation results 0 2 4 8 10 12 8 X10-3 Wing pitch angle TVA mass displacement 2 4 8 10 12 time [s] Wing, mass [eu] f(t) [N] 0.02 0.015 0.01 0.005 11 10.5 9.5 10 Simulation results 9 0 2 4 6 8 10 12 Wing pitch angle TVA mass displacement 0 0 2 6 8 10 12 time [s] The system's visual representation is shown in the following figure together with its constituent components, model elements and relevant geometry information (note the offset dimensions). Pivot point/torsional hinge Aerofoil/vertical stabiliser (mass moment of inertia / about the hinge) Grounded torsional spring kt and damper Ct Applied force F(t) Damped TVA m,c,k This is a two degree-of-freedom problem where the first DOF is realised by the aerofoil pitching and the second DOF is linked with the vertical motion of the TVA mass.