Mechanical properties of the macaw palm fruit-rachilla 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/1/30290 |
Resumo: | The fruit of the native macaw palm [Acrocomia aculeata (lacq) Lood. ex Mart] is an alternative for biodiesel production because of the plant characteristics, as well as its adaptability, hardiness and high vegetable oil yield. However, its exploitation remains extractive and there are significant difficulties in its harvest. This study aimed to determine the mechanical properties of the macaw palm fruit-rachilla system that will support the design of harvest machines based on mechanical vibration. Ten samples of four accessions in the immature and mature stages of maturity were used. Traction and vibration tests were conducted to determine the mechanical properties of the macaw palm fruit-rachilla system. The elastic modulus of the rachilla was 188.39-385.09 MPa for the immature stage and 109.02-320.54 MPa for the mature stage. The Poisson's ratio for the rachilla varied between 0.20 and 0.52 for the immature stage and between 0.16 and 0.52 for the mature stage. The damping ratio varied between 0.02 and 0.12 for the immature stage and between 0.06 and 0.12 for the mature stage. The fruit-rachilla system was characterized as underdamped. |
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Mechanical properties of the macaw palm fruit-rachilla systemPropriedades mecânicas do sistema fruto-ráquila de macaúbaMacaúba - BiodieselColheita por vibração mecânicaRazão de amortecimentoRazão de poissonMacaw - BiodieselMechanical vibration harvestingCushion ratioPoisson ratioThe fruit of the native macaw palm [Acrocomia aculeata (lacq) Lood. ex Mart] is an alternative for biodiesel production because of the plant characteristics, as well as its adaptability, hardiness and high vegetable oil yield. However, its exploitation remains extractive and there are significant difficulties in its harvest. This study aimed to determine the mechanical properties of the macaw palm fruit-rachilla system that will support the design of harvest machines based on mechanical vibration. Ten samples of four accessions in the immature and mature stages of maturity were used. Traction and vibration tests were conducted to determine the mechanical properties of the macaw palm fruit-rachilla system. The elastic modulus of the rachilla was 188.39-385.09 MPa for the immature stage and 109.02-320.54 MPa for the mature stage. The Poisson's ratio for the rachilla varied between 0.20 and 0.52 for the immature stage and between 0.16 and 0.52 for the mature stage. The damping ratio varied between 0.02 and 0.12 for the immature stage and between 0.06 and 0.12 for the mature stage. The fruit-rachilla system was characterized as underdamped.O fruto da palmeira nativa macaúba [Acrocomia aculeata (lacq) Lood. ex Mart] é uma alternativa para a produção de biodiesel devido às características da planta, como sua adaptabilidade, rusticidade e alta produção de óleo vegetal. Contudo, sua exploração ainda é extrativista e há grandes dificuldades em sua colheita. Objetivou-se determinar as propriedades mecânicas do sistema fruto-ráquila de macaúba que servirão de suporte aos projetos de máquinas para colheita por vibração mecânica. Foram utilizadas dez amostras de quatro acessos, nos estádios de maturação imaturo e maduro. Ensaios de tração e vibração foram realizados para determinar as propriedades mecânicas do sistema fruto-ráquila. O módulo de elasticidade obtido para a ráquila foi de 188,39-385,09 MPa para o estádio imaturo e 109,02-320,54 MPa para o maduro. A razão de Poisson para a ráquila ficou entre 0,20 e 0,52 para o estádio imaturo e entre 0,16 e 0,52 para o maduro. A razão de amortecimento encontrada variou entre 0,02 e 0,12 para o estádio imaturo e entre 0,06 e 0,12 para o maduro. O sistema fruto-ráquila foi caracterizado como subamortecido.Escola de Agronomia/UFG2018-08-30T17:33:27Z2018-08-30T17:33:27Z2017-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfVELLOSO, N. S. et al. Mechanical properties of the macaw palm fruit-rachilla system. Pesquisa Agropecuária Tropical, Goiânia, v. 47, n. 2, p. 218-225, Apr./Jun. 2017.http://repositorio.ufla.br/jspui/handle/1/30290Pesquisa Agropecuária Tropicalreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessVelloso, Nara SilveiraSantos, Fábio LúcioPinto, Francisco de Assis de CarvalhoVillar, Flora Maria de MeloValente, Domingos Sárvio Magalhãeseng2018-08-30T17:33:28Zoai:localhost:1/30290Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2018-08-30T17:33:28Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Mechanical properties of the macaw palm fruit-rachilla system Propriedades mecânicas do sistema fruto-ráquila de macaúba |
title |
Mechanical properties of the macaw palm fruit-rachilla system |
spellingShingle |
Mechanical properties of the macaw palm fruit-rachilla system Velloso, Nara Silveira Macaúba - Biodiesel Colheita por vibração mecânica Razão de amortecimento Razão de poisson Macaw - Biodiesel Mechanical vibration harvesting Cushion ratio Poisson ratio |
title_short |
Mechanical properties of the macaw palm fruit-rachilla system |
title_full |
Mechanical properties of the macaw palm fruit-rachilla system |
title_fullStr |
Mechanical properties of the macaw palm fruit-rachilla system |
title_full_unstemmed |
Mechanical properties of the macaw palm fruit-rachilla system |
title_sort |
Mechanical properties of the macaw palm fruit-rachilla system |
author |
Velloso, Nara Silveira |
author_facet |
Velloso, Nara Silveira Santos, Fábio Lúcio Pinto, Francisco de Assis de Carvalho Villar, Flora Maria de Melo Valente, Domingos Sárvio Magalhães |
author_role |
author |
author2 |
Santos, Fábio Lúcio Pinto, Francisco de Assis de Carvalho Villar, Flora Maria de Melo Valente, Domingos Sárvio Magalhães |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Velloso, Nara Silveira Santos, Fábio Lúcio Pinto, Francisco de Assis de Carvalho Villar, Flora Maria de Melo Valente, Domingos Sárvio Magalhães |
dc.subject.por.fl_str_mv |
Macaúba - Biodiesel Colheita por vibração mecânica Razão de amortecimento Razão de poisson Macaw - Biodiesel Mechanical vibration harvesting Cushion ratio Poisson ratio |
topic |
Macaúba - Biodiesel Colheita por vibração mecânica Razão de amortecimento Razão de poisson Macaw - Biodiesel Mechanical vibration harvesting Cushion ratio Poisson ratio |
description |
The fruit of the native macaw palm [Acrocomia aculeata (lacq) Lood. ex Mart] is an alternative for biodiesel production because of the plant characteristics, as well as its adaptability, hardiness and high vegetable oil yield. However, its exploitation remains extractive and there are significant difficulties in its harvest. This study aimed to determine the mechanical properties of the macaw palm fruit-rachilla system that will support the design of harvest machines based on mechanical vibration. Ten samples of four accessions in the immature and mature stages of maturity were used. Traction and vibration tests were conducted to determine the mechanical properties of the macaw palm fruit-rachilla system. The elastic modulus of the rachilla was 188.39-385.09 MPa for the immature stage and 109.02-320.54 MPa for the mature stage. The Poisson's ratio for the rachilla varied between 0.20 and 0.52 for the immature stage and between 0.16 and 0.52 for the mature stage. The damping ratio varied between 0.02 and 0.12 for the immature stage and between 0.06 and 0.12 for the mature stage. The fruit-rachilla system was characterized as underdamped. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-04 2018-08-30T17:33:27Z 2018-08-30T17:33:27Z |
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 |
VELLOSO, N. S. et al. Mechanical properties of the macaw palm fruit-rachilla system. Pesquisa Agropecuária Tropical, Goiânia, v. 47, n. 2, p. 218-225, Apr./Jun. 2017. http://repositorio.ufla.br/jspui/handle/1/30290 |
identifier_str_mv |
VELLOSO, N. S. et al. Mechanical properties of the macaw palm fruit-rachilla system. Pesquisa Agropecuária Tropical, Goiânia, v. 47, n. 2, p. 218-225, Apr./Jun. 2017. |
url |
http://repositorio.ufla.br/jspui/handle/1/30290 |
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 |
Escola de Agronomia/UFG |
publisher.none.fl_str_mv |
Escola de Agronomia/UFG |
dc.source.none.fl_str_mv |
Pesquisa Agropecuária Tropical 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_ |
1807835062371090432 |