Detection and control of transverse cracks on rotating machines
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Tese |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFU |
Texto Completo: | https://repositorio.ufu.br/handle/123456789/28188 http://doi.org/10.14393/ufu.te.2019.2515 |
Resumo: | In this dissertation, crack detection and crack control of rotating machinery are addressed. The objectives of this study involves building and validating a numerical model capable of simulating the dynamic behavior of a real rotating machine. Numerical and experimental results for crack detection based on the shaft vibration signals are obtained. Besides, numerical and experimental results from an active control method, capable of suppressing 2X and 3X super-harmonics are obtained, excited by the crack presence. The innovation of this thesis lays on the fact of merging crack detection and crack control techniques in one single study. It is worth mentioning that the subject of crack control is quite new in the literature. The rotor is modeled by the finite element (FE) method, considering Timoshenko beam elements with circular cross section and constant radius. The Mayes model is addressed for simulating the breathing behavior of a transverse crack in a progressive way. The linear fracture mechanics theory is applied to correlate the crack depth with the corresponding additional shaft flexibility. The so-called modal state observer (MSO) technique was chosen to verify the existence of a transverse crack on a rotating machine. Moreover, the PID active control technique was addressed to perform crack control, suppressing crack signatures over the rotor frequency spectrum. Both numerical and experimental results highlight the possibility of detecting the existence of a crack and also how to decrease its effects (through active control) of an operating rotating machine. In this way, inspections requiring full stop of the machine can be performed less often while keeping the rotating machine safety. |
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Detection and control of transverse cracks on rotating machinesDetecção e controle de trincas transversais em máquinas rotativasRotordynamicsCrack detectionActive vibration controlStructure Health Monitoring (SHM)Self-Healing (SH)Dinâmica de máquinas rotativasDetecção de trincasControle ativo de vibraçõesMonitoramento da integridade estruturalAuto-reparaçãoCNPQ::ENGENHARIAS::ENGENHARIA MECANICA::MECANICA DOS SOLIDOSIn this dissertation, crack detection and crack control of rotating machinery are addressed. The objectives of this study involves building and validating a numerical model capable of simulating the dynamic behavior of a real rotating machine. Numerical and experimental results for crack detection based on the shaft vibration signals are obtained. Besides, numerical and experimental results from an active control method, capable of suppressing 2X and 3X super-harmonics are obtained, excited by the crack presence. The innovation of this thesis lays on the fact of merging crack detection and crack control techniques in one single study. It is worth mentioning that the subject of crack control is quite new in the literature. The rotor is modeled by the finite element (FE) method, considering Timoshenko beam elements with circular cross section and constant radius. The Mayes model is addressed for simulating the breathing behavior of a transverse crack in a progressive way. The linear fracture mechanics theory is applied to correlate the crack depth with the corresponding additional shaft flexibility. The so-called modal state observer (MSO) technique was chosen to verify the existence of a transverse crack on a rotating machine. Moreover, the PID active control technique was addressed to perform crack control, suppressing crack signatures over the rotor frequency spectrum. Both numerical and experimental results highlight the possibility of detecting the existence of a crack and also how to decrease its effects (through active control) of an operating rotating machine. In this way, inspections requiring full stop of the machine can be performed less often while keeping the rotating machine safety.CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorTese (Doutorado)Esta tese considera detecção e controle de uma trinca transversal em máquinas rotativas. Os objetivos deste estudo envolvem a obtenção e o ajuste de um modelo matemático que represente o comportamento dinâmico de uma máquina rotativa real, a aplicação numérica e experimental de um método de detecção de falhas baseado no sinal de vibração do rotor e de um método de controle ativo de trincas que reduza os níveis dos super-harmônicos 2X e 3X excitados pela presença da trinca no espectro de frequência do rotor. A novidade desta tese está no fato de se realizar detecção e controle de trinca em um único projeto de pesquisa. Além disso, o controle ativo de trincas ainda é um assunto novo nesta área. A modelagem matemática do rotor utiliza o método dos Elementos Finitos (FE) e considera elementos de viga de Timoshenko, com seção circular e raio constates. O comportamento dinâmico da trinca transversal é modelado pelo modelo de Mayes, que considera abertura e fechamento da trinca de maneira progressiva. Mecânica da fratura linear é aplicada, a fim de relacionar a profundidade da trinca com o aumento da flexibilidade do eixo. O observador de estado modal (MSO) foi utilizado nesta tese quando do estudo do problema de detecção de trincas. Já para o controle ativo da trinca, a técnica de controle PID foi aplicada. Os resultados evidenciam a possibilidade de se diagnosticar uma trinca e diminuir seus efeitos (através do controle ativo) sobre uma máquina rotativa em operação. Desta forma, manutenções que exigem a parada da máquina podem ser realizadas com menor frequência e, mesmo assim, a segurança da máquina rotativa é garantida.Universidade Federal de UberlândiaBrasilPrograma de Pós-graduação em Engenharia MecânicaCavalini Jr, Aldemir Aparecidohttp://lattes.cnpq.br/0387727577180664Steffen Júnior, Valderhttp://lattes.cnpq.br/6838375689601075Oliveira, Leopoldo Pisanelli Rodrigues dehttp://lattes.cnpq.br/8542579855895033Souza, Francisco José dehttp://lattes.cnpq.br/1257320066520278Daniel, Gregory Bregionhttp://lattes.cnpq.br/1427377100514783Leão, Leandro de Souza2020-01-08T11:58:56Z2020-01-08T11:58:56Z2019-11-29info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfLEÃO, Leandro de Souza. Detection and control of transverse cracks on rotating machines. 2019. 136 f. Tese (Doutorado em Engenharia Mecânica) - Universidade Federal de Uberlândia, Uberlândia, 2019. DOI http://doi.org/10.14393/ufu.te.2019.2515.https://repositorio.ufu.br/handle/123456789/28188http://doi.org/10.14393/ufu.te.2019.2515enghttp://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFUinstname:Universidade Federal de Uberlândia (UFU)instacron:UFU2021-10-26T21:19:52Zoai:repositorio.ufu.br:123456789/28188Repositório InstitucionalONGhttp://repositorio.ufu.br/oai/requestdiinf@dirbi.ufu.bropendoar:2021-10-26T21:19:52Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)false |
dc.title.none.fl_str_mv |
Detection and control of transverse cracks on rotating machines Detecção e controle de trincas transversais em máquinas rotativas |
title |
Detection and control of transverse cracks on rotating machines |
spellingShingle |
Detection and control of transverse cracks on rotating machines Leão, Leandro de Souza Rotordynamics Crack detection Active vibration control Structure Health Monitoring (SHM) Self-Healing (SH) Dinâmica de máquinas rotativas Detecção de trincas Controle ativo de vibrações Monitoramento da integridade estrutural Auto-reparação CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::MECANICA DOS SOLIDOS |
title_short |
Detection and control of transverse cracks on rotating machines |
title_full |
Detection and control of transverse cracks on rotating machines |
title_fullStr |
Detection and control of transverse cracks on rotating machines |
title_full_unstemmed |
Detection and control of transverse cracks on rotating machines |
title_sort |
Detection and control of transverse cracks on rotating machines |
author |
Leão, Leandro de Souza |
author_facet |
Leão, Leandro de Souza |
author_role |
author |
dc.contributor.none.fl_str_mv |
Cavalini Jr, Aldemir Aparecido http://lattes.cnpq.br/0387727577180664 Steffen Júnior, Valder http://lattes.cnpq.br/6838375689601075 Oliveira, Leopoldo Pisanelli Rodrigues de http://lattes.cnpq.br/8542579855895033 Souza, Francisco José de http://lattes.cnpq.br/1257320066520278 Daniel, Gregory Bregion http://lattes.cnpq.br/1427377100514783 |
dc.contributor.author.fl_str_mv |
Leão, Leandro de Souza |
dc.subject.por.fl_str_mv |
Rotordynamics Crack detection Active vibration control Structure Health Monitoring (SHM) Self-Healing (SH) Dinâmica de máquinas rotativas Detecção de trincas Controle ativo de vibrações Monitoramento da integridade estrutural Auto-reparação CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::MECANICA DOS SOLIDOS |
topic |
Rotordynamics Crack detection Active vibration control Structure Health Monitoring (SHM) Self-Healing (SH) Dinâmica de máquinas rotativas Detecção de trincas Controle ativo de vibrações Monitoramento da integridade estrutural Auto-reparação CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::MECANICA DOS SOLIDOS |
description |
In this dissertation, crack detection and crack control of rotating machinery are addressed. The objectives of this study involves building and validating a numerical model capable of simulating the dynamic behavior of a real rotating machine. Numerical and experimental results for crack detection based on the shaft vibration signals are obtained. Besides, numerical and experimental results from an active control method, capable of suppressing 2X and 3X super-harmonics are obtained, excited by the crack presence. The innovation of this thesis lays on the fact of merging crack detection and crack control techniques in one single study. It is worth mentioning that the subject of crack control is quite new in the literature. The rotor is modeled by the finite element (FE) method, considering Timoshenko beam elements with circular cross section and constant radius. The Mayes model is addressed for simulating the breathing behavior of a transverse crack in a progressive way. The linear fracture mechanics theory is applied to correlate the crack depth with the corresponding additional shaft flexibility. The so-called modal state observer (MSO) technique was chosen to verify the existence of a transverse crack on a rotating machine. Moreover, the PID active control technique was addressed to perform crack control, suppressing crack signatures over the rotor frequency spectrum. Both numerical and experimental results highlight the possibility of detecting the existence of a crack and also how to decrease its effects (through active control) of an operating rotating machine. In this way, inspections requiring full stop of the machine can be performed less often while keeping the rotating machine safety. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-11-29 2020-01-08T11:58:56Z 2020-01-08T11:58:56Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
LEÃO, Leandro de Souza. Detection and control of transverse cracks on rotating machines. 2019. 136 f. Tese (Doutorado em Engenharia Mecânica) - Universidade Federal de Uberlândia, Uberlândia, 2019. DOI http://doi.org/10.14393/ufu.te.2019.2515. https://repositorio.ufu.br/handle/123456789/28188 http://doi.org/10.14393/ufu.te.2019.2515 |
identifier_str_mv |
LEÃO, Leandro de Souza. Detection and control of transverse cracks on rotating machines. 2019. 136 f. Tese (Doutorado em Engenharia Mecânica) - Universidade Federal de Uberlândia, Uberlândia, 2019. DOI http://doi.org/10.14393/ufu.te.2019.2515. |
url |
https://repositorio.ufu.br/handle/123456789/28188 http://doi.org/10.14393/ufu.te.2019.2515 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/publicdomain/zero/1.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/publicdomain/zero/1.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Uberlândia Brasil Programa de Pós-graduação em Engenharia Mecânica |
publisher.none.fl_str_mv |
Universidade Federal de Uberlândia Brasil Programa de Pós-graduação em Engenharia Mecânica |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFU instname:Universidade Federal de Uberlândia (UFU) instacron:UFU |
instname_str |
Universidade Federal de Uberlândia (UFU) |
instacron_str |
UFU |
institution |
UFU |
reponame_str |
Repositório Institucional da UFU |
collection |
Repositório Institucional da UFU |
repository.name.fl_str_mv |
Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU) |
repository.mail.fl_str_mv |
diinf@dirbi.ufu.br |
_version_ |
1805569678149419008 |