Rami Veiberman, Martin Weiss, Moti Karpel

DOI Number: N/A

Conference number: IFASD-2015-054

The common linear aeroservoelastic equations of motion for dynamic loads analysis are modified to avoid the use of the standard control-mode approach that requires 3rd-order linear actuators. The modification requires the structural modes to be generated with fictitious inertia terms at structural degrees of freedom that represent the relative control-surface rotation angles. The resulting modes can accurately accommodate the concentrated hinge moments applied by the actuators, hence be used in a direct-force approach that avoids the generation of control modes and the associated inertial and aerodynamic matrices. The direct-force approach does not require the standard 3rd-order linear actuator models, which facilitates the introduction of nonlinear elements at any part of the actuator model. The increased-order modeling method, utilized in the Dynresp code, is used in a comparative investigation between the control-mode and direct-force approaches. The sample application is based on the Green Regional Aircraft model developed by Alenia Aermacchi for the development of loads alleviation control laws in the Clean Sky 1 project.

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In Categories: 2. IFASD 2015, Aeroservoelasticity
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