Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of friction and asymmetric freeplay on the limit cycle oscillation in aeroelastic system: An extended Henon's technique to temporal integration

Full text
Author(s):
Wayhs-Lopes, Larissa Drews [1] ; Dowell, Earl H. [2] ; Bueno, Douglas D. [3, 4]
Total Authors: 3
Affiliation:
[1] Sao Paulo State Univ, Dept Mech Engn, BR-15385000 Ilha Solteira, SP - Brazil
[2] Duke Univ, Durham, NC - USA
[3] Sao Paulo State Univ, Dept Math, BR-15385000 Ilha Solteira, SP, Brazil.Wayhs-Lopes, Larissa Drews, Sao Paulo State Univ, Dept Mech Engn, BR-15385000 Ilha Solteira, SP - Brazil
[4] Sao Paulo State Univ, Dept Math, BR-15385000 Ilha Solteira, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF FLUIDS AND STRUCTURES; v. 96, JUL 2020.
Web of Science Citations: 0
Abstract

Nonlinear effects such as friction and freeplay on the control surfaces can affect aeroelastic dynamics during flight. In particular, these nonlinearities can induce limit cycle oscillations (LCO), changing the system stability, and because of this it is essential to employ computational methods to predict this type of motion during the aircraft development cycle. In this context, the present article presents a matrix notation for describing the Henon's method used to reduce errors when considering piecewise linear nonlinearities in the numerical integration process. In addition, a new coordinate system is used to write the aeroelastic system of equations. The proposal defines a displacement vector with generalized and physical variables to simplify the computational implementation of the Henon's technique. Additionally, the article discusses the influence of asymmetric freeplay and friction on the LCO of an airfoil with control surface. The results show that the extended Henon's technique provides more accurate LCO predictions, that friction can change the frequency and amplitude of these motions, and the asymmetry of freeplay is important to determine the LCO behavior. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 18/23348-6 - A critical evaluation of the Hénon's technique for solving aeroelastic problems with control surface friction and freeplay
Grantee:Larissa Drews Wayhs Lopes
Support type: Scholarships abroad - Research Internship - Scientific Initiation
FAPESP's process: 18/25194-6 - Aeroelastic Gust Alleviation Including Control Surface Nonlinearities
Grantee:Douglas Domingues Bueno
Support type: Scholarships abroad - Research
FAPESP's process: 17/08008-1 - Analysis of gust response including control surface freeplay and friction
Grantee:Larissa Drews Wayhs Lopes
Support type: Scholarships in Brazil - Scientific Initiation