Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
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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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_ |
1815439276927614976 |