Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/169103 |
Resumo: | Stall-induced vibrations are a relevant aeroelastic problem for very flexible aero-structures. Helicopter blades, wind turbines, or other rotating components are severely inflicted to vibrate in stall condition during each revolution of its rotor. Despite a significant effort to model the aerodynamics associated to the stall phenomena, non-linear aeroelastic behavior prediction and analysis in such flow regime remain formidable challenges. Another source of nonlinearity with influence to aeroelastic response may be associated to structural dynamics. The combination of both separated flow aerodynamic and structural nonlinearities lead to complex dynamics, for instance, bifurcations and chaos. The purpose of this work is to present the analysis of stall-induced vibrations of an airfoil in pitching when concentrated nonlinearities are associated to its structural dynamics. Limit cycles oscillations at higher angles of attach and complex non-linear features are analyzed for different nonlinear models for concentrated restoring pitching moment. The pitching-only typical section dynamics is coupled with an unsteady aerodynamic model based on Beddoes-Leishmann semi-empirical approach to produce the proper framework for gathering time series of aeroelastic responses. The analyses are performed by checking the content of the aeroelastic responses prior and after limit cycle oscillations occur. Evolutions on limit cycles amplitudes are used to reveal bifurcation points, thereby providing important information to assess, characterize, and qualify the nonlinear behavior associated with combinations of different forms to represent concentrated pitching spring of the typical section. |
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Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoilsAeroelasticityDynamic stallNonlinear dynamicsNonlinear vibrationsStall-induced vibrationsStall-induced vibrations are a relevant aeroelastic problem for very flexible aero-structures. Helicopter blades, wind turbines, or other rotating components are severely inflicted to vibrate in stall condition during each revolution of its rotor. Despite a significant effort to model the aerodynamics associated to the stall phenomena, non-linear aeroelastic behavior prediction and analysis in such flow regime remain formidable challenges. Another source of nonlinearity with influence to aeroelastic response may be associated to structural dynamics. The combination of both separated flow aerodynamic and structural nonlinearities lead to complex dynamics, for instance, bifurcations and chaos. The purpose of this work is to present the analysis of stall-induced vibrations of an airfoil in pitching when concentrated nonlinearities are associated to its structural dynamics. Limit cycles oscillations at higher angles of attach and complex non-linear features are analyzed for different nonlinear models for concentrated restoring pitching moment. The pitching-only typical section dynamics is coupled with an unsteady aerodynamic model based on Beddoes-Leishmann semi-empirical approach to produce the proper framework for gathering time series of aeroelastic responses. The analyses are performed by checking the content of the aeroelastic responses prior and after limit cycle oscillations occur. Evolutions on limit cycles amplitudes are used to reveal bifurcation points, thereby providing important information to assess, characterize, and qualify the nonlinear behavior associated with combinations of different forms to represent concentrated pitching spring of the typical section.Engineering School of São Carlos University of São PauloSão Paulo State University (UNESP)São Paulo State University (UNESP)Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Pereira, Daniel A.Vasconcellos, Rui M.G. [UNESP]Marques, Flávio D.2018-12-11T16:44:29Z2018-12-11T16:44:29Z2014-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject3153-3160Proceedings of the International Conference on Structural Dynamic , EURODYN, v. 2014-January, p. 3153-3160.2311-9020http://hdl.handle.net/11449/1691032-s2.0-8499443097703479922475174420000-0001-7288-5408Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengProceedings of the International Conference on Structural Dynamic , EURODYN0,165info:eu-repo/semantics/openAccess2021-10-23T21:44:31Zoai:repositorio.unesp.br:11449/169103Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T13:39:53.313913Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils |
title |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils |
spellingShingle |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils Pereira, Daniel A. Aeroelasticity Dynamic stall Nonlinear dynamics Nonlinear vibrations Stall-induced vibrations |
title_short |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils |
title_full |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils |
title_fullStr |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils |
title_full_unstemmed |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils |
title_sort |
Influence of structural nonlinearities in stall-induced aeroelastic response of pitching airfoils |
author |
Pereira, Daniel A. |
author_facet |
Pereira, Daniel A. Vasconcellos, Rui M.G. [UNESP] Marques, Flávio D. |
author_role |
author |
author2 |
Vasconcellos, Rui M.G. [UNESP] Marques, Flávio D. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Pereira, Daniel A. Vasconcellos, Rui M.G. [UNESP] Marques, Flávio D. |
dc.subject.por.fl_str_mv |
Aeroelasticity Dynamic stall Nonlinear dynamics Nonlinear vibrations Stall-induced vibrations |
topic |
Aeroelasticity Dynamic stall Nonlinear dynamics Nonlinear vibrations Stall-induced vibrations |
description |
Stall-induced vibrations are a relevant aeroelastic problem for very flexible aero-structures. Helicopter blades, wind turbines, or other rotating components are severely inflicted to vibrate in stall condition during each revolution of its rotor. Despite a significant effort to model the aerodynamics associated to the stall phenomena, non-linear aeroelastic behavior prediction and analysis in such flow regime remain formidable challenges. Another source of nonlinearity with influence to aeroelastic response may be associated to structural dynamics. The combination of both separated flow aerodynamic and structural nonlinearities lead to complex dynamics, for instance, bifurcations and chaos. The purpose of this work is to present the analysis of stall-induced vibrations of an airfoil in pitching when concentrated nonlinearities are associated to its structural dynamics. Limit cycles oscillations at higher angles of attach and complex non-linear features are analyzed for different nonlinear models for concentrated restoring pitching moment. The pitching-only typical section dynamics is coupled with an unsteady aerodynamic model based on Beddoes-Leishmann semi-empirical approach to produce the proper framework for gathering time series of aeroelastic responses. The analyses are performed by checking the content of the aeroelastic responses prior and after limit cycle oscillations occur. Evolutions on limit cycles amplitudes are used to reveal bifurcation points, thereby providing important information to assess, characterize, and qualify the nonlinear behavior associated with combinations of different forms to represent concentrated pitching spring of the typical section. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-01-01 2018-12-11T16:44:29Z 2018-12-11T16:44:29Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Proceedings of the International Conference on Structural Dynamic , EURODYN, v. 2014-January, p. 3153-3160. 2311-9020 http://hdl.handle.net/11449/169103 2-s2.0-84994430977 0347992247517442 0000-0001-7288-5408 |
identifier_str_mv |
Proceedings of the International Conference on Structural Dynamic , EURODYN, v. 2014-January, p. 3153-3160. 2311-9020 2-s2.0-84994430977 0347992247517442 0000-0001-7288-5408 |
url |
http://hdl.handle.net/11449/169103 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Proceedings of the International Conference on Structural Dynamic , EURODYN 0,165 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
3153-3160 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128261034606592 |