Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/30276 |
Resumo: | Detachment of coffee fruit is usually accomplished by means of mechanical impacts and vibrations applied to the plant. Modal properties of the coffee fruit-stem system represent important information for efficient and selective harvesting. This study aimed to determine the modal parameters of the coffee fruit-stem system, such as natural frequency and damping coefficient, using high speed digital videos. With image processing techniques, it was obtained the resulting displacement of the system subjected to an impulse. The modal parameters were determined by the logarithmic decrement method, considering the system as underdamped. The use of high-speed video and digital image processing techniques allowed the simple and reliable determination of modal parameters of the coffee fruit-stem system. Natural frequencies for the coffee fruit-stem system were 11.62 and 13.29 Hz; the damping coefficient was 0.0253 and 0.029 N s m-1, and the equivalent stiffness was 8.61 and 7.09 N m-1 for red and green ripening stages, respectively. It was found overlap of resonance bands, between the ripening stages red and green, hindering the selective mechanical detachment in the first natural frequency range of the coffee fruit-stem system. |
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Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processingDeterminação das propriedades modais do sistema fruto-pedúnculo do café por vídeos de alta velocidade e processamento de imagens digitaisImage segmentationMechanical harvestingMechanical vibrationsCoffee - HarvestingSegmentação de imagensColheita mecânicaVibrações mecânicasCafé - ColheitaDetachment of coffee fruit is usually accomplished by means of mechanical impacts and vibrations applied to the plant. Modal properties of the coffee fruit-stem system represent important information for efficient and selective harvesting. This study aimed to determine the modal parameters of the coffee fruit-stem system, such as natural frequency and damping coefficient, using high speed digital videos. With image processing techniques, it was obtained the resulting displacement of the system subjected to an impulse. The modal parameters were determined by the logarithmic decrement method, considering the system as underdamped. The use of high-speed video and digital image processing techniques allowed the simple and reliable determination of modal parameters of the coffee fruit-stem system. Natural frequencies for the coffee fruit-stem system were 11.62 and 13.29 Hz; the damping coefficient was 0.0253 and 0.029 N s m-1, and the equivalent stiffness was 8.61 and 7.09 N m-1 for red and green ripening stages, respectively. It was found overlap of resonance bands, between the ripening stages red and green, hindering the selective mechanical detachment in the first natural frequency range of the coffee fruit-stem system.Universidade Estadual de Maringá2018-08-30T16:49:28Z2018-08-30T16:49:28Z2016-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfVILLIBOR, G. P. et al. Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing. Acta Scientiarum. Technology, Maringá, v. 38, n. 1, p. 41-48, Jan./Mar. 2016.http://repositorio.ufla.br/jspui/handle/1/30276Acta Scientiarum. Technologyreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessVillibor, Geice PaulaSantos, Fábio LúcioQueiroz, Daniel Marçal deKhoury Júnior, Joseph KalilPinto, Francisco de Assis de Carvalhoeng2023-05-02T18:17:09Zoai:localhost:1/30276Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-05-02T18:17:09Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing Determinação das propriedades modais do sistema fruto-pedúnculo do café por vídeos de alta velocidade e processamento de imagens digitais |
title |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing |
spellingShingle |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing Villibor, Geice Paula Image segmentation Mechanical harvesting Mechanical vibrations Coffee - Harvesting Segmentação de imagens Colheita mecânica Vibrações mecânicas Café - Colheita |
title_short |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing |
title_full |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing |
title_fullStr |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing |
title_full_unstemmed |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing |
title_sort |
Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing |
author |
Villibor, Geice Paula |
author_facet |
Villibor, Geice Paula Santos, Fábio Lúcio Queiroz, Daniel Marçal de Khoury Júnior, Joseph Kalil Pinto, Francisco de Assis de Carvalho |
author_role |
author |
author2 |
Santos, Fábio Lúcio Queiroz, Daniel Marçal de Khoury Júnior, Joseph Kalil Pinto, Francisco de Assis de Carvalho |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Villibor, Geice Paula Santos, Fábio Lúcio Queiroz, Daniel Marçal de Khoury Júnior, Joseph Kalil Pinto, Francisco de Assis de Carvalho |
dc.subject.por.fl_str_mv |
Image segmentation Mechanical harvesting Mechanical vibrations Coffee - Harvesting Segmentação de imagens Colheita mecânica Vibrações mecânicas Café - Colheita |
topic |
Image segmentation Mechanical harvesting Mechanical vibrations Coffee - Harvesting Segmentação de imagens Colheita mecânica Vibrações mecânicas Café - Colheita |
description |
Detachment of coffee fruit is usually accomplished by means of mechanical impacts and vibrations applied to the plant. Modal properties of the coffee fruit-stem system represent important information for efficient and selective harvesting. This study aimed to determine the modal parameters of the coffee fruit-stem system, such as natural frequency and damping coefficient, using high speed digital videos. With image processing techniques, it was obtained the resulting displacement of the system subjected to an impulse. The modal parameters were determined by the logarithmic decrement method, considering the system as underdamped. The use of high-speed video and digital image processing techniques allowed the simple and reliable determination of modal parameters of the coffee fruit-stem system. Natural frequencies for the coffee fruit-stem system were 11.62 and 13.29 Hz; the damping coefficient was 0.0253 and 0.029 N s m-1, and the equivalent stiffness was 8.61 and 7.09 N m-1 for red and green ripening stages, respectively. It was found overlap of resonance bands, between the ripening stages red and green, hindering the selective mechanical detachment in the first natural frequency range of the coffee fruit-stem system. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-01 2018-08-30T16:49:28Z 2018-08-30T16:49:28Z |
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 |
VILLIBOR, G. P. et al. Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing. Acta Scientiarum. Technology, Maringá, v. 38, n. 1, p. 41-48, Jan./Mar. 2016. http://repositorio.ufla.br/jspui/handle/1/30276 |
identifier_str_mv |
VILLIBOR, G. P. et al. Determination of modal properties of the coffee fruit-stem system using high speed digital video and digital image processing. Acta Scientiarum. Technology, Maringá, v. 38, n. 1, p. 41-48, Jan./Mar. 2016. |
url |
http://repositorio.ufla.br/jspui/handle/1/30276 |
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_ |
1807835076278353920 |