Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
ANALYSIS OF AEROELASTIC STABILITY OF VISCOELASTIC SANDWICH PANELS IN SUBSONIC REGIME USING THE NONPLANAR DOUBLET-LATTICE METHOD
Submission Author:
Bruno Sousa Carneiro da Cunha , MG
Co-Authors:
Bruno Sousa Carneiro da Cunha, Antonio Marcos de Lima
Presenter: Bruno Sousa Carneiro da Cunha
doi://10.26678/ABCM.COBEM2023.COB2023-1550
Abstract
The engineers of aeronautical industries are frequently facing with subsonic panel flutter phenomena, where the design and analyses of aerospace vehicles requires the knowledge of their critical flutter speeds for safety requirements and to avoid catastrophes. Thus, whenever possible it is important to evaluate efficient and low-cost aeroelastic control strategies to deal with the problem of panel flutter phenomenon. In this context, the use of passive constraining viscoelastic layers seems to be an interesting alternative to be used in such situations. However, the structural and aerodynamic modeling procedures of an aeroviscoelastic system subjected to a subsonic airflow are not easy. In most of the cases, the difficult is related to the fact that, the viscoelastic behavior depends strongly on the excitation frequency and temperature, resulting in some difficulties during the coupling between the structural and aerodynamic models to account for the unsteady aerodynamics and complex behavior of the viscoelastic part, simultaneously. In this study, it is proposed an efficient numerical strategy to model aeroviscoelastic systems under subsonic airflows for panel flutter suppression. Here, the curved plate model of a thin three-layer sandwich panel and aerodynamic loadings using the nonplanar doublet lattice method are constructed both in MATLAB® environment code. Also, to solve the resulting equations of motion of the complex aeroviscoelastic system, an improved version of the p-k method is proposed herein to estimate the critical flutter speeds and to verify the possibility of increasing the critical flutter speeds of the base panel by using viscoelastic materials. The influence of design parameters characterizing the performance of the viscoelastic treatment and its operation temperature on the flutter boundary has been also addressed herein.
Keywords
flutter suppression, viscoelastic materials, doublet lattice method, unsteady aerodynamic, aeroviscoelastic system
