&lt;b&gt;Mechanical properties of the rachis from macaw palm bunche

Oliveira, Zenil Ricardo Cunha Rodrigues de; Santos, Fábio Lúcio; Valente, Domingos Sárvio Magalhães; Pinto, Francisco de Assis de Carvalho; Velloso, Nara Silveira

doi:10.4025/actasciagron.v40i1.39504

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…This result is important because the determination of such properties for this specific part of the model is difficult to quantify, and this condition represents what occurs in the actual physical system. Mechanical properties for rachillas, fruits, and rachis of macaw palm have been determined by Villar et al, 14 Velloso et al, 15 and De Oliveira et al; 16 however, in both studies, the properties for the joint between fruit and rachilla were not presented. One way to approximate the simulated values to the experimental values is through stochastic simulations, where the input data (in this case the value of elasticity modulus of the joint between rachilla and fruit) are determined from random values around the mean observed values.…”

Section: Resultsmentioning

confidence: 99%

“…11,12 Domestication, physical properties, and fruit harvesting systems have been studied to learn how to obtain quality raw material for macaw palm production. [13][14][15][16][17][18][19] The use of computational modeling through numerical simulations is a skillful way of designing, understanding, and evaluating harvesting mechanisms without the need for destructive testing and the design of prototypes. [20][21][22][23] It is believed that the principle of mechanical vibration is applicable to the harvest of macaw palm fruits, 18 so the determination and knowledge of modal properties, natural frequencies, and modal forms of the plants, or part of them, are necessary when computationally studying the behavior and the interaction of the plant with the machines that can promote the harvest of its fruits.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and simulation of the dynamic behavior of the macaw palm fruit-rachilla system

et al. 2021

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The macaw palm ( Acrocomia aculeata) is a palm tree native to tropical forests that stand out due to its great potential for oil production. This study was developed with the objective of constructing a high-fidelity model of the macaw palm fruit-rachilla system for the purpose of simulating its dynamic behavior when subjected to mechanical vibrations. The finite element method was used to determine the natural frequencies and modes of vibration of the system. The three-dimensional models of the fruit-rachilla systems were elaborated using CAD3D Fusion 360 software. The modal properties of the fruit-rachilla systems were obtained based on the models developed by varying the elasticity modulus values of the system. The parameters of greatest influence in the estimation of natural frequencies are the elasticity modulus, especially that of the fruit-rachilla joint, and the specific mass. The models that take into account the three-dimensional strains along the rachilla are the least sensitive to variations in the mechanical properties (elasticity modulus and specific mass) and are shown to be more representative of the actual physical system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and simulation of the dynamic behavior of the macaw palm fruit-rachilla system

et al. 2021

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“…The lack of studies that incorporate the effect of the impact coming from the contact between harvester rods and the dynamic behavior of coffee stems is noteworthy, although it could make the analyses much closer to reality and contribute to the search for more efficient of mechanized harvesting systems. In this scenario, techniques based on the mechanical vibration principle can be used in the mechanized harvesting of different crops such as grape [8], coffee [2,3,5], macaw [7] and orange [1].…”

Section: Introductionmentioning

confidence: 99%

Transmissibility of coffee fruit-peduncle-branch systems submitted to vibration induced by impact

Gomes

Santos

Nascimento

et al. 2020

DYNA

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The development of efficient machines for coffee harvesting requires solid knowledge about the dynamic behavior of the plant. Vibration transmissibility is a parameter on dynamic behavior that may help understand this process. The aim of this study was to evaluate the average vibration transmissibility in coffee fruit-peduncle-branch samples containing unripe and ripe fruits. The experiments were performed using Arabica coffee plants of the cultivar Catuaí Vermelho. The samples were submitted to three vibration frequency levels, 20, 30 and 40 Hz, induced to the branch with impact of rigid fiberglass rods moving at a constant amplitude 2 mm. Data on acceleration were collected using an accelerometer fixed to the branch. The frequency of 20 Hz presented the highest transmissibility. Samples containing ripe fruits also presented high transmissibility when compared to those containing unripe fruits.

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“…Tensile and compressive tests were also performed by Villar et al (2017), Velloso et al (2017) and Oliveira et al (2018) with the objective of creating a database of geometric and mechanical properties for the macaw palm crop, which, similarly to coffee, is a crop in which fruit harvest can be performed by machines that use the mechanical vibration principle (Grupioni et al, 2018).…”

Section: Introductionmentioning

confidence: 99%