Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Control Systems for Flutter Suppression of a Typical Section
Submission Author:
Gefferson Silva , SP
Co-Authors:
Flávio Silvestre, Mauricio Donadon, Osmar de Sousa Santos, Antônio Bernardo Guimarães Neto, ROBERTO GIL ANNES DA SILVA, Thiago Versiani, Rafael Bertolin, Gefferson Silva
Presenter: Gefferson Silva
doi://10.26678/ABCM.COBEM2017.COB17-1988
Abstract
Flutter is the most important phenomenon in aeroelastics. Important concerns associated to it are the difficulties to predict flutter and to control it. This paper describes the use of a typical airfoil section that presents a simple binary flutter behavior as a testbed for the development of active and passive control systems for flutter instability suppression. The wing section is a NACA 0012 airfoil with a trailing edge control surface used as actuator. The active control strategy consists of a stability augmentation system with output feedback to maintain the system stable in closed-loop. The equations of motion were developed using Lagrange's equations and the Principle of Virtual Work. The aerodynamic loads are estimated by an unsteady time-domain formulation based on Wagner's function. The passive control system employs a shape memory alloy to induce an additional torsional stiffness related to its crystallographic phase transformation. Experimental results show considerable reduction of the oscillation amplitudes at a relative low cost for both active and passive strategies, and that the use of shape memory alloys for aeroelastic control is promising.
Keywords
Aeroelasticity, Shape memory alloys (SMA), Active flutter suppression, typical section
