An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s11012-019-01101-4 http://hdl.handle.net/11449/198303 |
Resumo: | Landing gear shimmy is a self excited vibration phenomenon which must be avoided during aircraft design due to its potentially catastrophic behaviour. In a preliminary specification of structural properties of a landing gear, if shimmy is verified through the engineering process of analysis, typically is a difficult task to identify how its mechanical property must be modified to get a shimmy free system. In this sense, this article introduces an adaptation of the eigenstructure assignment theory (EAT) to design a nose landing gear free of the dynamic behaviour of shimmy. EAT is a classical theory employed to compute a feedback control gain which represents a linear transformation of the system states to control forces.The common application of this theory involves active and semi-active controllers, which require electro-mechanical actuators and additional source of energy. However, in this article EAT is adapted to write the matrix of gain in terms increments of structural stiffness and damping of the landing gear to update a previous design to get a shimmy free system.The proposed process allows to specify a desired new structural mode (though an eigenvector) and both frequency and damping ratio (through an eigenvalue). The strategy allows to compute new values of stiffness and damping to redesign a stable system with better vibration response of landing gear. The proposed approach can be applied in the eigenstructure assignment of any linear system, by means a practical process of changing the system properties (stiffness and damping), in the case of this article, to avoid landing gear shimmy. The results shows the effectiveness of the method. |
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An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theoryEigenstructure assigmentInverse problemLanding gearModes of vibrationShimmyLanding gear shimmy is a self excited vibration phenomenon which must be avoided during aircraft design due to its potentially catastrophic behaviour. In a preliminary specification of structural properties of a landing gear, if shimmy is verified through the engineering process of analysis, typically is a difficult task to identify how its mechanical property must be modified to get a shimmy free system. In this sense, this article introduces an adaptation of the eigenstructure assignment theory (EAT) to design a nose landing gear free of the dynamic behaviour of shimmy. EAT is a classical theory employed to compute a feedback control gain which represents a linear transformation of the system states to control forces.The common application of this theory involves active and semi-active controllers, which require electro-mechanical actuators and additional source of energy. However, in this article EAT is adapted to write the matrix of gain in terms increments of structural stiffness and damping of the landing gear to update a previous design to get a shimmy free system.The proposed process allows to specify a desired new structural mode (though an eigenvector) and both frequency and damping ratio (through an eigenvalue). The strategy allows to compute new values of stiffness and damping to redesign a stable system with better vibration response of landing gear. The proposed approach can be applied in the eigenstructure assignment of any linear system, by means a practical process of changing the system properties (stiffness and damping), in the case of this article, to avoid landing gear shimmy. The results shows the effectiveness of the method.São Paulo State University (UNESP), Av. Brasil 56, CentroDom Bosco Catholic University (UCDB), Av. Tamandaré 6000São Paulo State University (UNESP), Av. Brasil 56, CentroUniversidade Estadual Paulista (Unesp)Dom Bosco Catholic University (UCDB)Laporte, Daniel J. [UNESP]Lopes, Vicente [UNESP]Bueno, Douglas D. [UNESP]2020-12-12T01:09:05Z2020-12-12T01:09:05Z2020-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article7-17http://dx.doi.org/10.1007/s11012-019-01101-4Meccanica, v. 55, n. 1, p. 7-17, 2020.1572-96480025-6455http://hdl.handle.net/11449/19830310.1007/s11012-019-01101-42-s2.0-85076796029Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMeccanicainfo:eu-repo/semantics/openAccess2021-10-23T08:05:11Zoai:repositorio.unesp.br:11449/198303Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T08:05:11Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory |
title |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory |
spellingShingle |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory Laporte, Daniel J. [UNESP] Eigenstructure assigment Inverse problem Landing gear Modes of vibration Shimmy |
title_short |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory |
title_full |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory |
title_fullStr |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory |
title_full_unstemmed |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory |
title_sort |
An approach to reduce vibration and avoid shimmy on landing gears based on an adapted eigenstructure assignment theory |
author |
Laporte, Daniel J. [UNESP] |
author_facet |
Laporte, Daniel J. [UNESP] Lopes, Vicente [UNESP] Bueno, Douglas D. [UNESP] |
author_role |
author |
author2 |
Lopes, Vicente [UNESP] Bueno, Douglas D. [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Dom Bosco Catholic University (UCDB) |
dc.contributor.author.fl_str_mv |
Laporte, Daniel J. [UNESP] Lopes, Vicente [UNESP] Bueno, Douglas D. [UNESP] |
dc.subject.por.fl_str_mv |
Eigenstructure assigment Inverse problem Landing gear Modes of vibration Shimmy |
topic |
Eigenstructure assigment Inverse problem Landing gear Modes of vibration Shimmy |
description |
Landing gear shimmy is a self excited vibration phenomenon which must be avoided during aircraft design due to its potentially catastrophic behaviour. In a preliminary specification of structural properties of a landing gear, if shimmy is verified through the engineering process of analysis, typically is a difficult task to identify how its mechanical property must be modified to get a shimmy free system. In this sense, this article introduces an adaptation of the eigenstructure assignment theory (EAT) to design a nose landing gear free of the dynamic behaviour of shimmy. EAT is a classical theory employed to compute a feedback control gain which represents a linear transformation of the system states to control forces.The common application of this theory involves active and semi-active controllers, which require electro-mechanical actuators and additional source of energy. However, in this article EAT is adapted to write the matrix of gain in terms increments of structural stiffness and damping of the landing gear to update a previous design to get a shimmy free system.The proposed process allows to specify a desired new structural mode (though an eigenvector) and both frequency and damping ratio (through an eigenvalue). The strategy allows to compute new values of stiffness and damping to redesign a stable system with better vibration response of landing gear. The proposed approach can be applied in the eigenstructure assignment of any linear system, by means a practical process of changing the system properties (stiffness and damping), in the case of this article, to avoid landing gear shimmy. The results shows the effectiveness of the method. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T01:09:05Z 2020-12-12T01:09:05Z 2020-01-01 |
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/10.1007/s11012-019-01101-4 Meccanica, v. 55, n. 1, p. 7-17, 2020. 1572-9648 0025-6455 http://hdl.handle.net/11449/198303 10.1007/s11012-019-01101-4 2-s2.0-85076796029 |
url |
http://dx.doi.org/10.1007/s11012-019-01101-4 http://hdl.handle.net/11449/198303 |
identifier_str_mv |
Meccanica, v. 55, n. 1, p. 7-17, 2020. 1572-9648 0025-6455 10.1007/s11012-019-01101-4 2-s2.0-85076796029 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Meccanica |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
7-17 |
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_ |
1792961735893712896 |