Modal properties of coffee plants via numerical simulation

Velloso, Nara Silveira; Magalhães, Ricardo Rodrigues; Santos, Fábio Lúcio; Santos, Alexandre Assis Rezende

doi:10.1016/j.compag.2020.105552

Cited by 9 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the simulations, it was observed groups of mode shapes with very similar frequency values related to bending modes for lateral vibration. According to [20] obtaining vibration modes in different directions for the same frequency is expected for a system in free vibration. Thus, the frequency values corresponding to the lateral vibration mode in the plane were considered at which the experimental modal analysis performed using by impact hammer.…”

Section: Resultsmentioning

confidence: 99%

“…Brazilian Archives of Biology and Technology. Vol.67: e24220331, 2024 www.scielo.br/babt Similarly, [20] experimentally and numerically determined the natural frequencies of the coffee plant of the Catuaí Vermelho (IAC 144) cultivar. To experimentally obtain the natural frequencies, the authors used a free vibration system so that the samples did not touch the soil.…”

Section: Resultsmentioning

confidence: 99%

“…The authors in [20] obtained Poisson ratio values of 0.09 and 0.25 for the Catuaí Vermelho (IAC 144) variety in compression tests for the stem and tensile tests for the branches, respectively. [7] determined the Poisson ratio obtained from stem samples from Catuaí Vermelho (IAC 144).…”

Section: Mechanical Properties Of the Branches Used In The Simulationsmentioning

confidence: 99%

“…Given the difficulty in correctly determining the Poisson ratio and the different results available in the literature for this property, an average value found in the literature [14,15,16,20] was used for this mechanical property as 0.30. It is noteworthy that for the purpose of simulation in this study, the sample material was considered to be homogeneous and isotropic.…”

Section: Mechanical Properties Of the Branches Used In The Simulationsmentioning

confidence: 99%

“…Representative models have been shown to be effective in decision-making regarding the coffee management and harvesting process [18,19]. According to [20] simulations can eliminate the need for field experiments and have become increasingly accurate.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dynamic Behavior of Coffee Branches: an Analysis Using the Finite Element Method

Melo Junior,

Santos,

Scinocca

et al. 2024

Braz. arch. biol. technol.

View full text Add to dashboard Cite

The use of computational simulation techniques is an important tool for the coffee harvesting issues, particularly the finite element method. The method is widely used in the structural analysis of agricultural machinery, as well as in the analysis of the stresses and vibrations of coffee branches and peduncles during the harvesting process. The present study aimed to develop three-dimensional finite element models of the plagiotropic branches of the Catuaí Vermelho variety of Arabica coffee in different positions along the orthotropic branches of the plant; considering high-fidelity models. Additionally, by considering the branches' experimental properties (physical-mechanical), the natural frequencies and vibration modes of the branches were determined by means of computer simulations. First, the geometric properties of the coffee branches were obtained by means of two images taken using a professional camera to obtain the input data of the virtual simulation. For the mechanical properties, it was used a semi-analytical digital scale, to obtain the mass of the specimens. The modulus of elasticity was determined using a universal testing machine. The variability in the simulated natural frequencies could be identified, which was on the order of 30% for the first frequency, regardless of the position of the branch in the plant. These values were lower for the other frequencies. Linear regression fits showed a coefficient of determination, and correlation tests were used to verify the relationship between the values obtained numerically and experimentally, which were validated by using experimental data using the modal analysis techniques.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%