Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Coffee Science (Online) |
Texto Completo: | https://coffeescience.ufla.br/index.php/Coffeescience/article/view/942 |
Resumo: | The development of an efficient machine for harvesting coffee requires comprehensive knowledge of the dynamic behavior of the plant and its parts. The finite element method is a numerical approach used to determine natural frequencies and mode shapes. However, the stochastic finite element method has not been employed for the analysis of the dynamic behavior of coffee. The aim is to determine the natural frequencies and mode shapes for the coffee fruit-stem-branch system. The natural frequencies and the mode shapes were determined by employing the stochastic finite element method, in which the elastic modulus and the specific mass were treated as random variables, and the variation in the natural frequency was obtained as a function of the variability of these properties. The natural frequencies were reduced according to the evolution of the ripening process of the fruit and stem or due to the increase in the total weight of the system due to an increase in the number of fruits attached to the stem. The natural frequencies increased with an increase in the elastic modulus or with a reduction in the specific mass. |
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Coffee Science (Online) |
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Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element methodComportamento dinâmico do sistema fruto-pedúnculo-ramo do cafeeiro, usando método de elementos finitos estocásticoCoffeemode shapesnatural frequenciesCaféfrequências naturaismodos de vibraçãoThe development of an efficient machine for harvesting coffee requires comprehensive knowledge of the dynamic behavior of the plant and its parts. The finite element method is a numerical approach used to determine natural frequencies and mode shapes. However, the stochastic finite element method has not been employed for the analysis of the dynamic behavior of coffee. The aim is to determine the natural frequencies and mode shapes for the coffee fruit-stem-branch system. The natural frequencies and the mode shapes were determined by employing the stochastic finite element method, in which the elastic modulus and the specific mass were treated as random variables, and the variation in the natural frequency was obtained as a function of the variability of these properties. The natural frequencies were reduced according to the evolution of the ripening process of the fruit and stem or due to the increase in the total weight of the system due to an increase in the number of fruits attached to the stem. The natural frequencies increased with an increase in the elastic modulus or with a reduction in the specific mass.O desenvolvimento de máquinas eficientes para a colheita do cafeeiro exige conhecimentos sólidos sobre o comportamento dinâmico da planta. O método de elementos finitos é uma ferramenta numérica utilizada para determinar frequências naturais e modos de vibração. Porém não se tem empregado o método de elementos finitos estocástico para análise do comportamento dinâmico do cafeeiro. Assim, objetivou-se neste trabalho determinar as frequências naturais e modos de vibração do sistema fruto-pedúnculo-ramo do cafeeiro. Foram determinadas as frequências naturais e os modos de vibração empregando-se o método de elementos finitos estocástico, em que o módulo de elasticidade e a massa específica dos frutos, pedúnculo e ramos foram tratados como variáveis aleatórias, obtendo-se a variação das frequências naturais em função da variabilidade destas propriedades. As frequências naturais reduziram na medida em que se evolui o estádio de maturação dos frutos e pedúnculos ou se aumenta a massa total do sistema, dado pelo aumento do número de frutos solidários ao pedúnculo. As frequências naturais aumentaram na medida em que se elevou o módulo de elasticidade ou se reduziu a massa específica dos frutos, pedúnculos e ramos.Editora UFLA2016-03-22info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://coffeescience.ufla.br/index.php/Coffeescience/article/view/942Coffee Science - ISSN 1984-3909; Vol. 11 No. 1 (2016); 1 - 10Coffee Science; Vol. 11 Núm. 1 (2016); 1 - 10Coffee Science; v. 11 n. 1 (2016); 1 - 101984-3909reponame:Coffee Science (Online)instname:Universidade Federal de Lavras (UFLA)instacron:UFLAenghttps://coffeescience.ufla.br/index.php/Coffeescience/article/view/942/pdf_1https://coffeescience.ufla.br/index.php/Coffeescience/article/view/942/1472Copyright (c) 2016 Coffee Science - ISSN 1984-3909https://creativecommons.org/info:eu-repo/semantics/openAccessCoelho, Andre Luiz de Fretasdos Santos, Fábio Lúciode Queiroz, Daniel MarçalPinto, Francisco de Assis de Carvalho2016-03-23T02:36:31Zoai:coffeescience.ufla.br:article/942Revistahttps://coffeescience.ufla.br/index.php/CoffeesciencePUBhttps://coffeescience.ufla.br/index.php/Coffeescience/oaicoffeescience@dag.ufla.br||coffeescience@dag.ufla.br|| alvaro-cozadi@hotmail.com1984-39091809-6875opendoar:2024-05-21T19:53:53.377880Coffee Science (Online) - Universidade Federal de Lavras (UFLA)true |
dc.title.none.fl_str_mv |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method Comportamento dinâmico do sistema fruto-pedúnculo-ramo do cafeeiro, usando método de elementos finitos estocástico |
title |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method |
spellingShingle |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method Coelho, Andre Luiz de Fretas Coffee mode shapes natural frequencies Café frequências naturais modos de vibração |
title_short |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method |
title_full |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method |
title_fullStr |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method |
title_full_unstemmed |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method |
title_sort |
Dynamic behavior of the coffee fruit-stem-branch system using Stochastic finite element method |
author |
Coelho, Andre Luiz de Fretas |
author_facet |
Coelho, Andre Luiz de Fretas dos Santos, Fábio Lúcio de Queiroz, Daniel Marçal Pinto, Francisco de Assis de Carvalho |
author_role |
author |
author2 |
dos Santos, Fábio Lúcio de Queiroz, Daniel Marçal Pinto, Francisco de Assis de Carvalho |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Coelho, Andre Luiz de Fretas dos Santos, Fábio Lúcio de Queiroz, Daniel Marçal Pinto, Francisco de Assis de Carvalho |
dc.subject.por.fl_str_mv |
Coffee mode shapes natural frequencies Café frequências naturais modos de vibração |
topic |
Coffee mode shapes natural frequencies Café frequências naturais modos de vibração |
description |
The development of an efficient machine for harvesting coffee requires comprehensive knowledge of the dynamic behavior of the plant and its parts. The finite element method is a numerical approach used to determine natural frequencies and mode shapes. However, the stochastic finite element method has not been employed for the analysis of the dynamic behavior of coffee. The aim is to determine the natural frequencies and mode shapes for the coffee fruit-stem-branch system. The natural frequencies and the mode shapes were determined by employing the stochastic finite element method, in which the elastic modulus and the specific mass were treated as random variables, and the variation in the natural frequency was obtained as a function of the variability of these properties. The natural frequencies were reduced according to the evolution of the ripening process of the fruit and stem or due to the increase in the total weight of the system due to an increase in the number of fruits attached to the stem. The natural frequencies increased with an increase in the elastic modulus or with a reduction in the specific mass. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-03-22 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://coffeescience.ufla.br/index.php/Coffeescience/article/view/942 |
url |
https://coffeescience.ufla.br/index.php/Coffeescience/article/view/942 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://coffeescience.ufla.br/index.php/Coffeescience/article/view/942/pdf_1 https://coffeescience.ufla.br/index.php/Coffeescience/article/view/942/1472 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2016 Coffee Science - ISSN 1984-3909 https://creativecommons.org/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2016 Coffee Science - ISSN 1984-3909 https://creativecommons.org/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Editora UFLA |
publisher.none.fl_str_mv |
Editora UFLA |
dc.source.none.fl_str_mv |
Coffee Science - ISSN 1984-3909; Vol. 11 No. 1 (2016); 1 - 10 Coffee Science; Vol. 11 Núm. 1 (2016); 1 - 10 Coffee Science; v. 11 n. 1 (2016); 1 - 10 1984-3909 reponame:Coffee Science (Online) instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Coffee Science (Online) |
collection |
Coffee Science (Online) |
repository.name.fl_str_mv |
Coffee Science (Online) - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
coffeescience@dag.ufla.br||coffeescience@dag.ufla.br|| alvaro-cozadi@hotmail.com |
_version_ |
1799874920379842560 |