Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system

Detalhes bibliográficos
Autor(a) principal: Coelho, Andre Luiz de Freitas
Data de Publicação: 2017
Outros Autores: Santos, Fabio Lucio, Pinto, Francisco de Assis de Carvalho, Queiroz, Daniel Marçal de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/30287
Resumo: The finite element method, which has been used to determine natural frequencies and mode shapes, is used to generate and solve differential equations that describe the investigated physical phenomenon. However, this method requires the use of geometric and mechanical properties as input parameters, which may be difficult to obtain experimentally. The objective of this study was to develop a method for determining the elastic moduli of coffee stems and branches by comparing the experimentally obtained natural frequency with the frequency obtained using the finite element method. The natural frequency was experimentally obtained using a dynamic sweep test of frequencies, in which the fruit-stem-branch system was excited over a range from 10 to 30 Hz. The natural frequency of the fruit-stem system was higher at the green stage than at the cherry stage, and the elastic modulus of the stem at the cherry stage was higher than for the green stage. The mean elastic modulus values were 15.74, 23.90 and 4645.90 MPa for the stem at the green and cherry stages and for the branch, respectively.
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spelling Dynamic test for determining the elastic modulus of coffee fruit-stem-branch systemEnsaio dinâmico para determinação do módulo de elasticidade do sistema fruto-pedúnculo-ramoMétodo de elementos finitosFrequência naturalMódulos de elasticidadeFinite element methodNatural frequencyModulus of elasticityThe finite element method, which has been used to determine natural frequencies and mode shapes, is used to generate and solve differential equations that describe the investigated physical phenomenon. However, this method requires the use of geometric and mechanical properties as input parameters, which may be difficult to obtain experimentally. The objective of this study was to develop a method for determining the elastic moduli of coffee stems and branches by comparing the experimentally obtained natural frequency with the frequency obtained using the finite element method. The natural frequency was experimentally obtained using a dynamic sweep test of frequencies, in which the fruit-stem-branch system was excited over a range from 10 to 30 Hz. The natural frequency of the fruit-stem system was higher at the green stage than at the cherry stage, and the elastic modulus of the stem at the cherry stage was higher than for the green stage. The mean elastic modulus values were 15.74, 23.90 and 4645.90 MPa for the stem at the green and cherry stages and for the branch, respectively.Entre as ferramentas para determinação das frequências naturais e modos de vibração tem-se a modelagem pelo método dos elementos finitos, que consiste na geração e solução de equações diferenciais que descrevem o fenômeno físico em estudo. No entanto, essa ferramenta exige como parâmetros de entrada as propriedades geométricas e mecânicas do sistema, difíceis de serem obtidas experimentalmente. Assim, objetivou-se desenvolver uma metodologia para a determinação do módulo de elasticidade do pedúnculo e do ramo do cafeeiro por meio da comparação da frequência natural experimental com a frequência obtida pelo método de elementos finitos. A frequência natural experimental foi obtida a partir de um ensaio de varredura de frequências, em que o sistema fruto-pedúnculo e o ramo foram excitados em uma faixa de 10 a 30 Hz. A partir dos resultados, verificou-se que a frequência natural do sistema fruto- pedúnculo no estádio de maturação verde foi superior ao cereja e que o módulo de elasticidade do pedúnculo no estádio de cereja foi superior ao valor para verde. Os valores médios para os módulos de elasticidade foram de 15,74; 23,90 e 4645,90 MPa para o pedúnculo nos estágios de maturação verde, cereja e para o ramo, respectivamente.Universidade Estadual de Maringá2018-08-30T17:24:25Z2018-08-30T17:24:25Z2017info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfCOELHO, A. L. de F. et al. Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system. Acta Scientiarum. Technology, Maringá, v. 39, p. 579-586, 2017. Suplemento.http://repositorio.ufla.br/jspui/handle/1/30287Acta Scientiarum. Technologyreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessCoelho, Andre Luiz de FreitasSantos, Fabio LucioPinto, Francisco de Assis de CarvalhoQueiroz, Daniel Marçal deeng2023-05-02T18:17:15Zoai:localhost:1/30287Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-05-02T18:17:15Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
Ensaio dinâmico para determinação do módulo de elasticidade do sistema fruto-pedúnculo-ramo
title Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
spellingShingle Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
Coelho, Andre Luiz de Freitas
Método de elementos finitos
Frequência natural
Módulos de elasticidade
Finite element method
Natural frequency
Modulus of elasticity
title_short Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
title_full Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
title_fullStr Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
title_full_unstemmed Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
title_sort Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
author Coelho, Andre Luiz de Freitas
author_facet Coelho, Andre Luiz de Freitas
Santos, Fabio Lucio
Pinto, Francisco de Assis de Carvalho
Queiroz, Daniel Marçal de
author_role author
author2 Santos, Fabio Lucio
Pinto, Francisco de Assis de Carvalho
Queiroz, Daniel Marçal de
author2_role author
author
author
dc.contributor.author.fl_str_mv Coelho, Andre Luiz de Freitas
Santos, Fabio Lucio
Pinto, Francisco de Assis de Carvalho
Queiroz, Daniel Marçal de
dc.subject.por.fl_str_mv Método de elementos finitos
Frequência natural
Módulos de elasticidade
Finite element method
Natural frequency
Modulus of elasticity
topic Método de elementos finitos
Frequência natural
Módulos de elasticidade
Finite element method
Natural frequency
Modulus of elasticity
description The finite element method, which has been used to determine natural frequencies and mode shapes, is used to generate and solve differential equations that describe the investigated physical phenomenon. However, this method requires the use of geometric and mechanical properties as input parameters, which may be difficult to obtain experimentally. The objective of this study was to develop a method for determining the elastic moduli of coffee stems and branches by comparing the experimentally obtained natural frequency with the frequency obtained using the finite element method. The natural frequency was experimentally obtained using a dynamic sweep test of frequencies, in which the fruit-stem-branch system was excited over a range from 10 to 30 Hz. The natural frequency of the fruit-stem system was higher at the green stage than at the cherry stage, and the elastic modulus of the stem at the cherry stage was higher than for the green stage. The mean elastic modulus values were 15.74, 23.90 and 4645.90 MPa for the stem at the green and cherry stages and for the branch, respectively.
publishDate 2017
dc.date.none.fl_str_mv 2017
2018-08-30T17:24:25Z
2018-08-30T17:24:25Z
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 COELHO, A. L. de F. et al. Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system. Acta Scientiarum. Technology, Maringá, v. 39, p. 579-586, 2017. Suplemento.
http://repositorio.ufla.br/jspui/handle/1/30287
identifier_str_mv COELHO, A. L. de F. et al. Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system. Acta Scientiarum. Technology, Maringá, v. 39, p. 579-586, 2017. Suplemento.
url http://repositorio.ufla.br/jspui/handle/1/30287
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Estadual de Maringá
publisher.none.fl_str_mv Universidade Estadual de Maringá
dc.source.none.fl_str_mv Acta Scientiarum. Technology
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
_version_ 1807835189768880128

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