Modelling the Dynamics of Flight Control Surfaces Under Actuation
Compliances and Losses

….viscous friction on the dynamics of an aerodynamic control surface,
during its deployment through an electro-hydraulic actuation system. Starting from the pilot command, a realistic nonlinear model of the electro-hydraulic servo system based actuation system is evolved, including the applicable nonlinearities. A realistic mathematical model for the control surface motion, under the action of the actuator forces and the aerodynamic and inertia forces is postulated, using subsonic incompressible aerodynamics. The mathematical model also includes the command shaping system. The above mathematical model is first verified for its consistency, by carrying out subsystem level simulation. Next, the complete system is simulated for pilot step input and typical control surface response is obtained for the command shaper. Particular attention is paid to the control surface force time histories during deployment that have the potential to excite the elastodynamics of the control surface, as these can modify the aerodynamic loads acting on the control surface..

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