Passive control of fluter applicated to a 3DOF airfoil

Abstract eng:
This paper presents numerical simulations of passive control of flutter applied to a two dimensional airfoil-aileron configuration. The geometric model is composed of two joint solids: a main airfoil which can pitch (a) and plunge (h), and a hinged Control Surface (8). Under potential flow, low angle and frequency hypothesis, a linearization of the aeroelastic system reaches out a strongly coupled formulation. The time-domain expression of the Theodorsen unsteady aerodynamic model is computed using R.T. Jones approximation the Wagner function. This work focuses on three strategies to shift the critical speed. Firstly, the called “Linear Vibration Absorber” (LTVA) is a tuned mass damper (TMD), placed inside the airfoil, which oscillates in the plunge direction. Secondly, the “NES” is a nonlinear damper, based on the Nonlinear Ensegy Sink technology. Thirdly, the named “Cubic Control Surface” (CCS) configuration consist nonlinear hinge jointure featuring cubic restoring forces.

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