Wing Box Panel with Actuator RBE2 Bracket, Follower Aero Pressure & Stop Contact

Geometrically nonlinear 3D cambered aeroelastic wing section combining an upper hydraulic actuator pylon and 5-slave RBE2 bellcrank (z = 0.25 m), live follower aerodynamic pressure, and unilateral contact against a lower stop cradle (z = 0.0 m).

High-load wing control surfaces and cambered wing box panels operate under coupled aeroelastic forces: distributed aerodynamic pressure that rotates with the deformed surface normal (follower pressure), actuator forces introduced through elevated bellcrank fittings above the wing contour, and lower travel-limiting stop cradles that arrest excessive downward deflection during high-g maneuvers. This 3D WebCAE model represents a 1.50 × 0.60 m cambered aviation aluminum wing section (40 MITC4 quads of t₁ = 5 mm at z(y) = 68…90 mm, stiffened by 5 longitudinal stringers and 7 arched ribs), an elevated hydraulic actuator bellcrank apex at z = 0.25 m (linked via a 5-leg pyramidal RBE2 spider to the central rib and connected by a Ø52 mm hydraulic cylinder rod to the root pylon), and a lower protective stop cradle at z = 0.0 m (0.60 × 0.56 m, 16 MITC4 quads of t₂ = 10 mm). Under combined actuator load (Fx = -12 kN, Fz = -28 kN) and live follower suction/pressure (950–1350 Pa), the wing deflects by -3.01 mm while remaining well above the lower cradle (minimum deformed skin height z = 65.7 mm), engaging 5 contact pairs across the elastomer bumper pads and deflecting the stop cradle by -1.76 mm.