Structural static and modal frequency simulations in a coffee harvester’s chassis

Silva, Evandro P. da; Silva, Fábio M. da; Andrade, Ednilton Tavares de; Magalhães, Ricardo Rodrigues

doi:10.1590/1807-1929/agriambi.v22n7p511-515

Cited by 6 publications

(6 citation statements)

References 19 publications

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“…Ebrahimi et al 23 2018 Dynamic behavior in a model of a scarifier rod. Silva et al 24 2018 Static and modal frequency simulations in a coffee harvester`s chassis Souza et al 25 2018 Evaluation of the interaction between a harvester rod and a coffee branch based on finite element analysis Hiroma. 17 In this study, the authors used an anisotropic elastic wheel model that included vertical and horizontal rigidities, in order to simplify the three-dimensional models normally used for twodimensional analysis by using tire, and soil models and a model from the friction between the tire and the soil.…”

Section: Fem Applications In Agricultural Mechanizationmentioning

confidence: 99%

“…Results showed agreement around 89%, demonstrating that the model was able to simulate the tire behavior. Silva et al 14 and Silva et al 24 modeled the coffee harvester structure and performed static and dynamic analysis to verify concentration points of stresses and displacements for two situations: the machine working with aligned rear wheels and the machine working with misaligned rear wheels. The mesh used for the model discretization was formed by triangular prism elements with sizes between 1.2 mm and 47.0 mm, generating 35,121 nodes.…”

Section: Fem Applications In Agricultural Mechanizationmentioning

confidence: 99%

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The Finite Element Method Applied to Agricultural Engineering: A Review

et al. 2018

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The use of numerical simulations has been widespread in many engineering fields and related areas. One of the main numerical methods used in modeling and simulations is the finite element method (FEM). Despite its wide dissemination, especially in mechanical and civil engineering, FEM has high potential to be applied in other areas, such as in agricultural engineering. This paper aims to present a review of the FEM applications in three agricultural engineering areas. This research is focused on agricultural mechanization, agricultural product processing and soil mechanics, since these are agricultural engineering areas with highest number of publications using FEM. As result, it is expected greater FEM dissemination in other agricultural engineering areas. In addition, modeling and simulation techniques can be widely used in order to represent the increasing behavior of agricultural machinery and products from real physical systems.

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Section: Fem Applications In Agricultural Mechanizationmentioning

confidence: 99%

Section: Fem Applications In Agricultural Mechanizationmentioning

confidence: 99%

The Finite Element Method Applied to Agricultural Engineering: A Review

et al. 2018

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“…To predict coffee harvester failures in the field, some studies have considered numerical simulations (Silva et al, 2014;Silva et al, 2018;Souza et al, 2018). In addition, other studies have been developed to predict failures in machines and components (Qi et al, 2019;Yarenet al, 2019;Qinglin et al, 2019;Shlyannikov and Ishtyryakov, 2019;Silva et al, 2020), including the welded joints of low-alloy steels (Berdnikova et al, 2019) and silos (Cao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Vibration and Strain Signal Acquisition for Numerical Simulation of a Coffee Harvester

Silva

Santos²,

Marques

et al. 2022

Theor Appl Eng

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Coffee harvesters utilize vibration systems to dislodge coffee beans. The vibration system is usually coupled to the end of an axis (rod cylinder). This cylinder can fail in the field, which usually occurs by means of cracks close to its flange in the region that promotes vibration. Numerical simulations are typically used to predict strains and stresses based on vibration signals in machines in general. This work acquired the vibration and strain signals of a coffee harvester rod cylinder prototype and compared the results using finite element analysis. To this end, a rod cylinder system was prototyped on a reduced scale (1:3) to recreate frequency and strain data, which were used for numerical simulation comparisons. The results showed that the predicted von Mises stress in the analyzed zone was 16.47 MPa (below the material yield strength, 250 MPa) based on a frequency of 14.2 Hz applied to the rod cylinder. This confirmed that cracks found in rod cylinders in the field are not generated by high stresses, as reported in the literature. The results demonstrated the potential of finite element analysis for strain and stress prediction when applied to agricultural machine components.

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“…Máquinas agrícolas derriçadoras normalmente trabalham com frequências próximas à ressonância do material orgânico de derriça. Considerando vibrações aliadas a imperfeições em regiões soldadas na estrutura destas máquinas podem originar fraturas em componentes ou sistema mecânico (FERREIRA JUNIOR et al, 2016;SILVA et al, 2018;SOUZA et al, 2018).…”

Section: Introductionunclassified

Análise experimental em um cilindro de varetas de uma colhedora de café para diagnóstico de falha

et al. 2020

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Colhedoras de café trabalham com um sistema de vibração para promover a derriça dos grãos. O sistema de vibração geralmente é acoplado na extremidade de um eixo, denominado por cilindro vibrador de varetas. Este cilindro pode apresentar falhas em campo, as quais geralmente ocorrem por fratura na região da solda entre o cilindro e seu flange. Observa-se em campo que, este tipo de falha ocorre em um curto intervalo de tempo, antes de 12 meses de trabalho constante, o que requer diagnóstico de falhas. Este trabalho tem como objetivo principal realizar o diagnóstico de falha em um cilindro vibrador de varetas de uma colhedora de café. Para isso, foi realizado o mapeamento da fratura e foram confeccionados corpos de prova para a realização de ensaios mecânicos destrutivos e não destrutivos (ensaio de tração, análise química dos materiais do cilindro vibrador de varetas e flange, metalografia das juntas soldadas e ensaios de dureza Vickers e Brinell. Os resultados das análises químicas e de dureza Brinell comprovaram que o material do cilindro de varetas se trata de um aço de baixo teor de carbono. Os resultados de dureza Vickers evidenciaram a não homogeneidade do metal depositado. Os resultados obtidos nos ensaios de tração foram próximos a valores encontrados na literatura, exceto para o alongamento. Os resultados metalográficos da junta soldada evidenciaram defeitos, como trinca e porosidade, que podem influenciara fratura. Neste sentido, foi proposto um procedimento de soldagem (EPs) para a melhoria do processo de fabricação da peça analisada. Palavras-chave: Colhedora de café. Ensaio mecânicos. Diagnóstico de falhas. Experimental analysis in a stell cylinder of a coffee harvest for failure diagnosis Abstract Coffee harvesters work with vibration system in order to promote the breaking of the grains peduncle. The vibration system is usually coupled to the end of an axis, called a rod vibrating cylinder. This cylinder can present failures on duty, which usually occurs due to fracture failure in the weld region between the cylinder and its flange. It is observed that this type of failure occurs in a short time, before 12 months of constant work, which requires a failure diagnosis. The main objective of this work is to perform failure diagnosis in the vibrating rod cylinder of a coffee harvester. To this end, a the fracture mapping was performed and samples were made specimens for destructive and non-destructive mechanical tests, such as tensile testing, chemical analysis of the pipe and flange materials, metallography of the welded joints and hardness testing Vickens and Brinell. Through these tests, it was observed problems due to the welding process applied between the rod cylinder and the flange, and to manufacturing defects of the axle (arising from the casting process). As a result, it was observed a probable fatigue failure process leading to a short service life in the cylinder-flange assembly. To solve this problem, a welding procedure (EPs) is proposed to improve the fabrication process of the rod cylinder. Keywords: Coffee harvester. Mechanical tests. Failure diagnosis.

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Structural static and modal frequency simulations in a coffee harvester’s chassis

Cited by 6 publications

References 19 publications

The Finite Element Method Applied to Agricultural Engineering: A Review

The Finite Element Method Applied to Agricultural Engineering: A Review

Vibration and Strain Signal Acquisition for Numerical Simulation of a Coffee Harvester

Análise experimental em um cilindro de varetas de uma colhedora de café para diagnóstico de falha

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