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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Dynamic assessment of nonlinear typical section aeroviscoelastic systems using fractional derivative-based viscoelastic model

Texto completo
Autor(es):
Sales, T. P. [1] ; Marques, Flavio D. [2] ; Pereira, Daniel A. [3] ; Rade, Domingos A. [3]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Fed Uberlandia, Sch Mech Engn, Uberlandia, MG - Brazil
[2] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mech Engn, Sao Carlos, SP - Brazil
[3] Aeronaut Inst Technol, Dept Mech Engn, Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Journal of Sound and Vibration; v. 423, p. 230-245, JUN 9 2018.
Citações Web of Science: 3
Resumo

Nonlinear aeroelastic systems are prone to the appearance of limit cycle oscillations, bifurcations, and chaos. Such problems are of increasing concern in aircraft design since there is the need to control nonlinear instabilities and improve safety margins, at the same time as aircraft are subjected to increasingly critical operational conditions. On the other hand, in spite of the fact that viscoelastic materials have already been successfully used for the attenuation of undesired vibrations in several types of mechanical systems, a small number of research works have addressed the feasibility of exploring the viscoelastic effect to improve the behavior of nonlinear aeroelastic systems. In this context, the objective of this work is to assess the influence of viscoelastic materials on the aeroelastic features of a three-degrees-of-freedom typical section with hardening structural nonlinearities. The equations of motion are derived accounting for the presence of viscoelastic materials introduced in the resilient elements associated to each degree-of-freedom. A constitutive law based on fractional derivatives is adopted, which allows the modeling of temperature-dependent viscoelastic behavior in time and frequency domains. The unsteady aerodynamic loading is calculated based on the classical linear potential theory for arbitrary airfoil motion. The aeroelastic behavior is investigated through time domain simulations, and subsequent frequency transformations, from which bifurcations are identified from diagrams of limit cycle oscillations amplitudes versus airspeed. The influence of the viscoelastic effect on the aeroelastic behavior, for different values of temperature, is also investigated. The numerical simulations show that viscoelastic damping can increase the flutter speed and reduce the amplitudes of limit cycle oscillations. These results prove the potential that viscoelastic materials have to increase aircraft components safety margins regarding aeroelastic stability. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 15/20363-6 - Identificação e controle tolerantes a falhas em sistemas rotativos
Beneficiário:Katia Lucchesi Cavalca Dedini
Modalidade de apoio: Auxílio à Pesquisa - Temático