Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
AEROELASTIC MODEL IDENTIFICATION OF AN ARFOIL
Submission Author:
Tobias Morais , MG
Co-Authors:
Pedro Fernandes R. Bonnas, Tobias Morais
Presenter: Pedro Fernandes R. Bonnas
doi://10.26678/ABCM.COBEM2021.COB2021-0826
Abstract
In the last decade, many works have been dedicated to the identification of aeroelastic systems. For linear systems, this process has been established by different techniques in both frequency and time domains, where mechanical parameters and behaviors can be identified from the system response and initial conditions. Systems identification is a procedure of developing a mathematical model of a physical structure based either on experimental or simulated data to generate reduced-order models (ROMs). The identification procedure is a critical stage in aircraft development, analysis, and validation. In this work, an identification procedure aiming to determine a linear time-invariant (LTI) aeroelastic airfoil is presented. To present the details of the proposed technique, a linear airfoil considering only the pitch – plunge motion is studied. The methodology is based on the use of orthogonal functions and their integration properties to transform the aeroelastic system differential equations of motion into a linear equation where the unknown parameters related to the aerodynamic loads can be determined. The structural parameters of the linear mechanical system are initially known and built on COMSOL Multiphysics. Fluid-structure interaction is simulated in COMSOL with the application of Computational Fluid Dynamics (CFD). The CFD is a method that is a valuable option in comparison with the traditional wind tunnels. However, it demands a high processing time and computational power, not becoming viable for designing aerodynamic components. With the proposed methodology, it is possible to determine the aerodynamic loads applied by the CFD to develop a reduced order model (ROM) based only on the input and the output of the aeroelastic system. The most significant advantage of the identified model is its ability to determine the system response for several airflow speeds and conditions, avoiding the systematic use of the CFD, optimizing engineering projects.
Keywords
Aeroelasticity, System Identification, orthogonal functions, reduced order model
