Application of Finite Elements Method for Structural Analysis in a Coffee Harvester

Silva, Evandro Pereira da; Silva, Fábio Moreira da; Magalhães, Ricardo Rodrigues

doi:10.4236/eng.2014.63017

Cited by 20 publications

(12 citation statements)

References 11 publications

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“…The finite element method can be used to solve different problems by dividing the model into the specific elements of the body being studied and generating a mesh as well as a group of equations that describe the behavior of the variables involved [ 8 ]. [ 9 ] Used a model to evaluate the dynamic behavior of the coffee tree using techniques of the finite element method.…”

Section: Introductionmentioning

confidence: 99%

Modal properties of fruit-rachilla system of the macaw palm

et al. 2021

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The macaw palm has been domesticated due to its potential use in the production of biofuel, in addition to several co-products that can be generated from its oil and pulp. One of the current challenges in this area is the harvesting, as there are no specific machines for this operation. Therefore, it is necessary to determine the appropriate information regarding the physical properties of the plant, so that it is feasible to develop the technologies necessary for the commercial scale application of macaw palm, allowing it to contribute to the sustainable production of raw material for the biofuel industry and other co-products. The principle of mechanical vibration can be used to shed fruit from trees when ripe, and it can be a method used for harvesting. Thus, as proposed in this study, it was necessary to study the dynamic behavior of the fruit-rachilla system during vibration. Hence, the modal properties of the system were determined. A study on the dynamic behaviors was carried out using a deterministic finite element model, and the natural frequencies were obtained through a frequency-scanning test to evaluate the model. The mean relative error (MRE) between the measured and simulated natural frequencies was also used to evaluate the model. The natural frequencies, determined experimentally, varied from 26.21 to 33.45 Hz on average, whereas the simulated frequencies varied from 24.81 to 39.27 Hz. The overall MRE was 9.08%. Once the model was validated, a sensibility test was carried out, which showed that the density of fruit and the elasticity modulus are the parameters that most influence the natural frequencies of the fruit-rachilla system.

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Section: Introductionmentioning

confidence: 99%

Modal properties of fruit-rachilla system of the macaw palm

et al. 2021

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“…Once we have a proper model, we can simulate the dynamic behavior of the fruit-rachilla system to estimate the modal properties. The finite element method can be used to solve different problems by dividing the model into the specific elements of the body being studied, and studied, and generating a mesh and a group of equations that describe the behavior of the variables involved (Silva et al, 2014). In the case of coffee, for example, a mathematical simulation using the finite element method was applied to obtain information regarding the modal parameters of the fruit-peduncle (Coelho et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Modal properties of fruit-rachilla system of the macaw palm

Villar

Pinto

Santos

et al. 2020

Preprint

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The macaw palm has been domesticated due to its potential use in the production of biodiesel. One of the current challenges in this area is to determine the proper information and develop the technologies required for using macaw palm, allowing it to contribute to the sustainable production of feedstock for biodiesel industry. The principle of mechanical vibration can be employed for the detachment of fruits from a tree bunch, and it is therefore necessary to study the dynamic behavior of the macaw palm fruit-rachilla system during the vibration. Hence, the modal properties of the system were determined. A study on the dynamic behaviors was carried out using a deterministic finite element model, and the natural frequencies were obtained through a frequency-scanning test to evaluate the model. The mean relative error (MRE) between the measured and simulated natural frequencies was also used to evaluate the model. The natural frequencies, determined experimentally, varied between 26.21 and 33.45 Hz on average, whereas the simulated frequencies varied from 24.81 to 39.27 Hz. The overall MRE was 9.08%. Once the model was validated, a sensibility test showed that the density of fruit and the elasticity modulus are the parameters that most influence the natural frequencies of the fruit-rachilla system.

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“…Coffee crop is going through a transitional period because of the difficulty in securing labor, which makes manual harvesting impractical (Ortega;Jesus, 2011;Silva et al, 2015). The mechanization of field activities allows greater operational efficiency and ensures the economic viability of coffee plantations, which, in this scenario, depend on reduced production costs Magalhães, 2014;Cunha et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of the impact of rigid rods on coffee fruit detachment efficiency by mechanical vibrations

Gomes

Santos

Nascimento

et al. 2020

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The mechanization of field activities has been the response of coffee producers to the labor shortage, especially for fruit harvesting. The use of mechanical harvesters allows greater harvesting efficiency and ensures the economic viability of coffee plantations, which currently depend mainly on the reduction in production costs. The principle used for mechanized coffee harvesting is based on the principle of mechanical vibration. The objective of this study was to analyze the dynamic behavior of the coffee fruit-peduncle-branch system under mechanical vibration and the impact of the vibrating rods on the fruit detachment process in association with this behavior. Fragments of coffee branches containing fruits in the unripe and ripe stages were used in this experiment. These samples were subjected to different frequencies (20, 30, 40, and 50 Hz) and amplitudes (0.002, 0.003, and 0.004 m). Another variable analyzed was the form of vibration transmission to the fruits, with the vibrations being transmitted to the samples with or without the impact of the fiberglass rods. The fruit detachment efficiency increased as the ripening stage progressed from unripe to ripe. A higher detachment efficiency occurred with the increase in vibration frequency and amplitude because of the higher vibrational energy imposed on the fruit. The detachment efficiency was low when the vibration was transmitted without the impact of the rods. Conversely, the vibration in combination with impact achieved a mean detachment efficiency of approximately 90%

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Application of Finite Elements Method for Structural Analysis in a Coffee Harvester

Cited by 20 publications

References 11 publications

Modal properties of fruit-rachilla system of the macaw palm

Modal properties of fruit-rachilla system of the macaw palm

Modal properties of fruit-rachilla system of the macaw palm

Effect of the impact of rigid rods on coffee fruit detachment efficiency by mechanical vibrations

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