Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.3390/drones5040122 http://hdl.handle.net/11449/222743 |
Resumo: | Aerial drones have improved significantly over the recent decades with stronger and smaller motors, more powerful propellers, and overall optimization of systems. These improvements have consequently increased top speeds and improved a variety of performance aspects, along with introducing new structural challenges, such as whirl flutter. Whirl flutter is an aeroelastic instability that can be affected by structural or aerodynamic nonlinearities. This instability may affect the prediction of potentially dangerous behaviors. In this work, a nonlinear reduced-order model for a nacelle-rotor system, considering quasi-steady aerodynamics, is implemented. First, a parametric study for the linear system is performed to determine the main aerodynamic and structural characteristics that affect the onset of instability. Multiple polynomial nonlinearities in the two degrees of freedom nacelle-rotor model are tested to simulate possible structural nonlinear effects including symmetric cubic hardening nonlinearities for the pitch and yaw degrees of freedom; purely yaw nonlinearity; purely pitch nonlinearity; and a combination of quadratic, cubic, and fifth-order nonlinearities for both degrees of freedom. Results show that the presence of hardening structural nonlinearities introduces limit cycle oscillations to the system in the post-flutter regime. Moreover, it is demonstrated that the inclusion of quadratic nonlinearity introduces asymmetric oscillations and subcritical behavior, where large and potentially dangerous deformations can be reached before the predicted linear flutter speed. |
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Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systemsFluid-structure interactionNonlinear dynamicsRotor-nacelle systemUnmanned aerial systemsWhirl flutterAerial drones have improved significantly over the recent decades with stronger and smaller motors, more powerful propellers, and overall optimization of systems. These improvements have consequently increased top speeds and improved a variety of performance aspects, along with introducing new structural challenges, such as whirl flutter. Whirl flutter is an aeroelastic instability that can be affected by structural or aerodynamic nonlinearities. This instability may affect the prediction of potentially dangerous behaviors. In this work, a nonlinear reduced-order model for a nacelle-rotor system, considering quasi-steady aerodynamics, is implemented. First, a parametric study for the linear system is performed to determine the main aerodynamic and structural characteristics that affect the onset of instability. Multiple polynomial nonlinearities in the two degrees of freedom nacelle-rotor model are tested to simulate possible structural nonlinear effects including symmetric cubic hardening nonlinearities for the pitch and yaw degrees of freedom; purely yaw nonlinearity; purely pitch nonlinearity; and a combination of quadratic, cubic, and fifth-order nonlinearities for both degrees of freedom. Results show that the presence of hardening structural nonlinearities introduces limit cycle oscillations to the system in the post-flutter regime. Moreover, it is demonstrated that the inclusion of quadratic nonlinearity introduces asymmetric oscillations and subcritical behavior, where large and potentially dangerous deformations can be reached before the predicted linear flutter speed.Department of Mechanical and Aerospace Engineering New Mexico State UniversityCampus of São João da Boa Vista São Paulo State University (UNESP)Campus of São João da Boa Vista São Paulo State University (UNESP)New Mexico State UniversityUniversidade Estadual Paulista (UNESP)Quintana, AnthonyVasconcellos, Rui [UNESP]Throneberry, GlenAbdelkefi, Abdessattar2022-04-28T19:46:30Z2022-04-28T19:46:30Z2021-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.3390/drones5040122Drones, v. 5, n. 4, 2021.2504-446Xhttp://hdl.handle.net/11449/22274310.3390/drones50401222-s2.0-85118127092Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengDronesinfo:eu-repo/semantics/openAccess2022-04-28T19:46:30Zoai:repositorio.unesp.br:11449/222743Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:46:30Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems |
title |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems |
spellingShingle |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems Quintana, Anthony Fluid-structure interaction Nonlinear dynamics Rotor-nacelle system Unmanned aerial systems Whirl flutter |
title_short |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems |
title_full |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems |
title_fullStr |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems |
title_full_unstemmed |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems |
title_sort |
Nonlinear analysis and bifurcation characteristics of whirl flutter in unmanned aerial systems |
author |
Quintana, Anthony |
author_facet |
Quintana, Anthony Vasconcellos, Rui [UNESP] Throneberry, Glen Abdelkefi, Abdessattar |
author_role |
author |
author2 |
Vasconcellos, Rui [UNESP] Throneberry, Glen Abdelkefi, Abdessattar |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
New Mexico State University Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Quintana, Anthony Vasconcellos, Rui [UNESP] Throneberry, Glen Abdelkefi, Abdessattar |
dc.subject.por.fl_str_mv |
Fluid-structure interaction Nonlinear dynamics Rotor-nacelle system Unmanned aerial systems Whirl flutter |
topic |
Fluid-structure interaction Nonlinear dynamics Rotor-nacelle system Unmanned aerial systems Whirl flutter |
description |
Aerial drones have improved significantly over the recent decades with stronger and smaller motors, more powerful propellers, and overall optimization of systems. These improvements have consequently increased top speeds and improved a variety of performance aspects, along with introducing new structural challenges, such as whirl flutter. Whirl flutter is an aeroelastic instability that can be affected by structural or aerodynamic nonlinearities. This instability may affect the prediction of potentially dangerous behaviors. In this work, a nonlinear reduced-order model for a nacelle-rotor system, considering quasi-steady aerodynamics, is implemented. First, a parametric study for the linear system is performed to determine the main aerodynamic and structural characteristics that affect the onset of instability. Multiple polynomial nonlinearities in the two degrees of freedom nacelle-rotor model are tested to simulate possible structural nonlinear effects including symmetric cubic hardening nonlinearities for the pitch and yaw degrees of freedom; purely yaw nonlinearity; purely pitch nonlinearity; and a combination of quadratic, cubic, and fifth-order nonlinearities for both degrees of freedom. Results show that the presence of hardening structural nonlinearities introduces limit cycle oscillations to the system in the post-flutter regime. Moreover, it is demonstrated that the inclusion of quadratic nonlinearity introduces asymmetric oscillations and subcritical behavior, where large and potentially dangerous deformations can be reached before the predicted linear flutter speed. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12-01 2022-04-28T19:46:30Z 2022-04-28T19:46:30Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.3390/drones5040122 Drones, v. 5, n. 4, 2021. 2504-446X http://hdl.handle.net/11449/222743 10.3390/drones5040122 2-s2.0-85118127092 |
url |
http://dx.doi.org/10.3390/drones5040122 http://hdl.handle.net/11449/222743 |
identifier_str_mv |
Drones, v. 5, n. 4, 2021. 2504-446X 10.3390/drones5040122 2-s2.0-85118127092 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Drones |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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_ |
1803649625632014336 |