Modelagem e validação de um cafeeiro por elementos finitos utilizando escaneamento 3D e análise modal experimental
Data
2023-10-06
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Lavras
Resumo
O café é um dos produtos mais importantes na economia brasileira, sendo o país o maior exportador do grão do mundo. Estudos voltados para simulações nas etapas de colheita mecanizada tem sido de grande interesse, tanto na academia quanto na agroindústria. Neste sentido, este trabalho tem como principal objetivo obter um modelo computacional dos ramos, empregando técnicas de escaneamento e validação experimental através de análise modal. Para isso, ramos de um cafeeiro Catuaí Vermelho foram escaneados e simulados computacionalmente para obtenção de um modelo computacional que represente o comportamento estático e dinâmico dos ramos. Previamente foi realizada a avaliação de quanto o modelo escaneado foi representativo aos dados obtidos experimentalmente. A massa específica e o módulo de elasticidade dos ramos selecionados foram obtidas em laboratório e utilizadas também como parâmetros para as simulações. Para a obtenção dos resultados de análises estática e modal, os modelos geométricos dos ramos foram simulados via Método dos Elementos Finitos (MEF). A validação do procedimento adotado deu-se por meio de experimentos, os quais certificaram que os três primeiros modos de vibração dos ramos ensaiados foram similares, observando-se desvios variando entre 2 e 20%. A análise estatística adotada indicou tendência de comportamento similar entre os ramos simulados e os resultados experimentais. Com base nos resultados obtidos, concluiu-se que é possível prever o comportamento dinâmico e estático de ramos de um cafeeiro a partir do escaneamento tridimensional e simulações numéricas via MEF. Isto pode ser considerado um avanço tecnológico, uma vez que normalmente são obtidos modelos simplificados por coordenadas geométricas.
Coffee is one of the most significant products in the Brazilian economy, with the country being the world's largest coffee exporter. Studies focused on simulations in the stages of mechanized harvesting have been of great interest, both in academia and in the agro-industry. In this context, the primary objective of this work is to obtain a computational model of coffee branches, employing scanning techniques and experimental validation through modal analysis. To achieve this, branches of a Red Catuai coffee plant were scanned and computationally simulated to obtain a computational model representing the static and dynamic behavior of the branches. Prior to this, an evaluation was performed to assess how representative the scanned model was compared to experimentally obtained data. The specific mass and elasticity modulus of the selected branches were obtained in the laboratory and used as parameters for the simulations. To obtain the results of static and modal analyses, the geometric models of the branches were simulated using the Finite Element Method (FEM). Validation of the adopted procedure was carried out through experiments, which confirmed that the first three vibration modes of the tested branches were similar, with deviations ranging from 2 to 20%. The adopted statistical analysis indicated a tendency of similar behavior between the simulated branches and the experimental results. Based on the results obtained, it was concluded that it is possible to predict the dynamic and static behavior of coffee branches through three-dimensional scanning and numerical simulations using FEM. This can be considered a technological advancement, as simplified models based on geometric coordinates are typically used.
Coffee is one of the most significant products in the Brazilian economy, with the country being the world's largest coffee exporter. Studies focused on simulations in the stages of mechanized harvesting have been of great interest, both in academia and in the agro-industry. In this context, the primary objective of this work is to obtain a computational model of coffee branches, employing scanning techniques and experimental validation through modal analysis. To achieve this, branches of a Red Catuai coffee plant were scanned and computationally simulated to obtain a computational model representing the static and dynamic behavior of the branches. Prior to this, an evaluation was performed to assess how representative the scanned model was compared to experimentally obtained data. The specific mass and elasticity modulus of the selected branches were obtained in the laboratory and used as parameters for the simulations. To obtain the results of static and modal analyses, the geometric models of the branches were simulated using the Finite Element Method (FEM). Validation of the adopted procedure was carried out through experiments, which confirmed that the first three vibration modes of the tested branches were similar, with deviations ranging from 2 to 20%. The adopted statistical analysis indicated a tendency of similar behavior between the simulated branches and the experimental results. Based on the results obtained, it was concluded that it is possible to predict the dynamic and static behavior of coffee branches through three-dimensional scanning and numerical simulations using FEM. This can be considered a technological advancement, as simplified models based on geometric coordinates are typically used.
Descrição
Dissertação de Mestrado defendida na Universidade Federal de Lavras
Palavras-chave
MEF, Propriedades dinâmicas, Colheita de café, Propriedades mecânicas, FEM, Dynamic properties, Coffee harvesting, Mechanical properties
Citação
SILVA, Davidson Silveira e. Modelagem e validação de um cafeeiro por elementos finitos utilizando escaneamento 3D e análise modal experimental. 2023. 74 p. Dissertação (Mestrado em Engenharia de Sistemas e Automação) – Universidade Federal de Lavras, Lavras, 2023.