Desenvolvimento de uma metodologia de análise da estabilidade de sistemas aeroviscoelásticos empregando o método Doublet Lattice

Abstract

In aeronautical industry the flutter phenomenon has a great importance and need to be investigated, since it can lead to catastrophes. Thus, the constant requirements for high-performance structures turns flutter a design metric for the optimization of aeroelastic performance. In this sense, the current solutions for optimal aeroelastic performance, involves passive or active aeroelastic control. Commonly, the techniques for passive control involves the use of anisotropic materials to affect aerodynamic and structural performance in a beneficial way. In order to achieve flutter suppression, the use of viscoelastic materials aims to improve aeroelastic performance, due to its high structural damping. The focus of this work was developed a methodology to study aeronautical structures using an implemented Doublet-Lattice Method (DLM) program to provide unsteady aerodynamics loads at a low computational cost. The program aims to be a reliable tool to investigate the feasibility of the application of viscoelastic materials in flutter suppression. A plate-like wing model is used to investigate the influence of viscoelastic treatment, on the form of a sandwich plate, in the aeroelastic stability considering subsonic flow. Finally, the influence of the viscoelastic treatment on the proposed structure was evaluated as well as the influence of environmental and operational parameters in the critical flutter velocity.