Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
STUDIES ON AEROELASTIC OPTIMIZATION OF COMPOSITE SWEPT WINGS
Submission Author:
Hermann Luis Lebkuchen , SP
Co-Authors:
Hermann Luis Lebkuchen, ROBERTO GIL ANNES DA SILVA, Carlos Eduardo de Souza
Presenter: Hermann Luis Lebkuchen
doi://10.26678/ABCM.COBEM2017.COB17-1395
Abstract
In an effort to explore structural challenges justified by aerodynamic advantages of swept wings, this paper presents the effects of sweep angle in aeroelastic stability response of a simplified wing model with a ballast mass attached on its tip. The aeroelastic response of wing models made of aluminum as well as carbon fiber-epoxy resin composite are investigated. First, the influence of ballast mass position on flutter and divergence speeds is presented for the three swept aluminum wings. The flutter speed results calculated with the numeric model are validated experimentally with wind tunnel tests. Proposed lay-ups made of constant stiffness composite have their aeroelastic response mapped over a defined fiber orientation domain. These composite wings are aeroelastic tailored to maximize flutter speeds for unswept, forward and backward swept models. The optimization is performed with a numeric aeroelastic stability objective function that relates flutter and divergence speeds as a function of lay-up orientation. The aeroelastic stability function couples structural finite element model with aerodynamic panel model. The aeroelastic system is solved using the G-method for subsonic unsteady incremental aerodynamics. Proposed lay-ups are optimized to maximum flutter speeds using genetic algorithm method. The management of aeroelastic stability and tailoring solutions is automated with the development of in house software. It is presented that the optimized lay-ups for forward swept wings can not only overcome the undesired effect of static aeroelastic divergence without losing the aerodynamic benefits but also result in a lighter structure.
Keywords
aeroelastic tailoring, divergence, Flutter, Composite Materials, Optimization, Aeroelasticity, Forward swept wings
