Abstract
This paper demonstrates the implementation of an adaptive feedforward controller to reduce structural vibrations on a wing typical section. The aeroelastic model includes a structural nonlinearity, which is modelled in a polynomial form. Aeroelastic vibrations are induced by several gusts and atmospheric turbulence, including the discrete “one-minus-cosine” and a notably good approximation in the time-domain to the von Kármán spectrum. The control strategy based on the adaptive feedforward controller has several advantages compared to the standard feedback controller. The controller gains, which are updated in real-time during the gust encounter, are found solving a minimization problem using the finite impulse responses as basis functions. To make progress with the application in aeroelasticity, a single-input single-output controller is designed measuring the wing torsional deformation. For both deterministic and random atmospheric shapes, the controller was found successful in alleviating the aeroelastic vibrations. The impact of the control action on the unmeasured structural modes was found minimal.
Highlights
In flight, aircraft regularly encounter atmospheric turbulence
Models of atmospheric turbulence for aircraft gust load analysis (GLA) have been developed over time and are today required by certification authorities
The control strategy performed well when including all the nonlinearities in the model. Based on this forerunner knowledge, this paper aims at investigating the deployment of an adaptive feedforward control strategy for GLA of a nonlinear aeroelastic plant
Summary
Turbulence, lightning, hail and other phenomena can lead to injuries and discomfort on board and damage to the aircraft [1], resulting in huge cost to airlines. Poor weather detection and analysis can result in poor pilot decision making which could lead to otherwise completely avoidable danger to flights [2]. Models of atmospheric turbulence for aircraft gust load analysis (GLA) have been developed over time and are today required by certification authorities. Less formal definitions of CAT have appeared but the most comprehensive definition is “turbulence encountered outside of convective clouds”. CAT is problematic because it is often encountered unexpectedly and frequently without visual clues to warn pilots of the hazard [5].
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