Simulation Parameter Calibration and Test of Typical Pear Varieties Based on Discrete Element Method

Fan, Guiju; Wang, Siyu; Shi, Wenjie; Gong, Zhenfeng; Gao, Ming

doi:10.3390/agronomy12071720

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…When the external force on the particles is greater than the bonding force between the particles, the bonding bonds between the particles break down, resulting in the deformation of the pot and matrix loss. Consequently, the model selected to examine the forces between the pot particles and the pot damage processes was the Hertz-Mindlin with bonding model [28,29]. The fundamental particles of the model used for this work were spherical.…”

Section: Establishment Of the Drop Impact Model Between The Pot And T...mentioning

confidence: 99%

Establishment of the Interaction Simulation Model between Plug Seedlings and Soil

Zeng,

Cui,

et al. 2023

Agronomy

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Currently, the simulation parameters for the model of the interaction between the transplanter, the plug seedlings, the soil, and the pot damage mechanism still need to be clarified. The optimization design of the planters and the improvement of planting quality are still urgent issues that need to be solved. In this paper, the simulation parameters of the pot and the soil were calibrated based on the pressure distribution measurement technology. With the actual collision impact force and matrix loss rate as the targets, a four-factor, three-level orthogonal test was designed to obtain the optimal parameters. Through the optimization analysis of the experimental results, it could be concluded that the pot–soil restitution coefficient, the pot–soil static friction coefficient, the pot–soil rolling friction coefficient, and the surface energy were 0.31, 0.88, 0.35, and 1.07 J/m2, respectively. The experimental verification of the optimal parameter combination showed that the relative error of the collision impact force was 1.65% and that the relative error of the matrix loss rate was 2.32%, which verified the model’s reliability. Based on the optimal parameters, the movement law of the hole tray seedlings was studied at different positions during the transplanting process. The plug seedlings collided not only with the planter but also with the soil, which led to the breakage and looseness of the pot structure. The relative error between the matrix loss rate of the transplanter inserting soil, the matrix loss rate of the transplanter that did not enter the soil, and the simulated matrix loss rate was less than 10%, which further proved the accuracy of the simulation model.

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Section: Establishment Of the Drop Impact Model Between The Pot And T...mentioning

confidence: 99%

Establishment of the Interaction Simulation Model between Plug Seedlings and Soil

Zeng,

Cui,

et al. 2023

Agronomy

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“…Simulation tests require the first step of building an accurate particle model. Ramie stalk phloem and xylem are nonspherical, and in DEM simulations, the multispherical method is usually used to construct irregular particle models [41][42][43][44]. In nonspherical particle discrete element simulations, the multichemical packing model has the advantages of fast calculation rate and simple contact judgment; however, as the number of filling particle elements increases, the simulation time will greatly increase, so the number of filling particle elements needs to be reasonable [45,46].…”

Section: Establishment Of a Discrete Element Model For Ramie Stalk Ph...mentioning

confidence: 99%

Calibration of Ramie Stalk Contact Parameters Based on the Discrete Element Method

Wang

Duan

et al. 2023

Agriculture

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To obtain the physical parameters and contact parameters of ramie stalk decorticating simulation, the structural dimensions, density, moisture content, elastic modulus, and contact parameters of the ramie stalk were measured in this study based on the phloem and xylem of the ramie stalk. The physical stacking angles of the phloem and xylem were measured by the cylinder lift method and the extraction of the partition method, respectively. The contact parameters between the xylem and phloem of the ramie stalk were directly calibrated. Additionally, the contact parameters of the phloem–phloem, phloem–Q235A steel, xylem–xylem, and xylem–Q235A steel were used as calibration objects, and the simulated stacking angle was used as the evaluation index. Then, the Plackett–Burman test was designed to screen for the parameters which were significantly affecting the simulated stacking angle. Furthermore, the steepest ascent test determined the optimal range of values for two significant parameters of the phloem and three significant parameters of the xylem. Based on the central composite design, the second-order regression equations between the significant parameters of the phloem and xylem and the stacking angle were established, respectively. The physical stacking angles of 37.93° for phloem and 27.17° for xylem were the target values to obtain the optimal parameter group. The results showed that the restitution, static, and rolling friction coefficients between the xylem and phloem were 0.60, 0.53, and 0.021, respectively. The static and rolling friction coefficients between the phloem and phloem were 0.41 and 0.056, respectively. The rolling friction coefficient between the xylem and Q235A steel was 0.033, and the static and rolling friction coefficients between the xylem and xylem were 0.44 and 0.016, respectively. The verification test showed that the relative error values were less than 2.11%, which further indicated that the modeling method and parameter calibration of the ramie stalk phloem and xylem models were accurate and reliable. They can be used for the subsequent calibration simulation tests of ramie stalk bonding parameters and ramie stalk decorticating simulations.

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“…To date, many studies on the calibration of discrete element parameters have been conducted for different agricultural materials, including soil [8,9], grain seeds [10][11][12], crop straws [11,[13][14][15][16], and fruit and vegetables [17,18], amongst others. Qiu et al [9] used the Plackett-Burman design and response surface method to calibrate the discrete element simulation parameters of cinnamon soil based on the Hertz-Mindlin model with the JKR contact model.…”

Section: Introductionmentioning

confidence: 99%

Calibration of Simulation Parameters for Fresh Tea Leaves Based on the Discrete Element Method

Li,

Wang,

Zhu

et al. 2024

Agriculture

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To address the problem of a lack of accurate parameters in the discrete element simulation study of the machine-picked fresh tea leaf mechanized-sorting process, this study used machine-picked fresh tea leaves as the research object, established discrete element models of different fresh tea leaf components in EDEM software version 7.0.0. based on the bonded particle model using three-dimensional scanning inverse-modeling technology, and calibrated the simulation parameters through physical tests and virtual simulation tests. Firstly, the intrinsic parameters of machine-picked tea leaves were measured using physical tests; the physical-stacking tea leaf test was conducted using the cylinder lifting method, the tea leaf repose angle being 32.62° as measured from the stacking images using CAD. With the physical repose angle as the target value, the Plackeet–Burman test, the steepest-ascent test and the Box–Behnken optimization test were conducted in turn, and the results showed that the static friction coefficient between tea leaves, the rolling friction coefficient between tea leaves and the static friction coefficient between tea leaves and PVC have a major effect on the repose angle, and the optimal combination of the three significant parameters was determined. Finally, five simulations were conducted using the optimal combination of parameters, the relative error between the repose angle measured by the simulation test and the physical repose angle being just 0.28%. Moreover, the t-test obtained p > 0.05, indicating that there was no significant difference between the simulation test results and the physical test results. The results showed that the calibrated discrete element simulation parameters obtained could provide a reference for the discrete element simulation study of fresh tea leaves.

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Simulation Parameter Calibration and Test of Typical Pear Varieties Based on Discrete Element Method

Cited by 11 publications

References 26 publications

Establishment of the Interaction Simulation Model between Plug Seedlings and Soil

Establishment of the Interaction Simulation Model between Plug Seedlings and Soil

Calibration of Ramie Stalk Contact Parameters Based on the Discrete Element Method

Calibration of Simulation Parameters for Fresh Tea Leaves Based on the Discrete Element Method

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