Calibration of the Discrete Element Parameters and Experimental Verification of the Oil Sunflower Plug Seedling Pots

Zeng, Fandi; Li, Xuying; Bai, Hongbin; Cui, Ji; LIU, Xuening; ZHANG, Yongzhi

doi:10.35633/inmateh-68-62

Cited by 4 publications

(2 citation statements)

References 24 publications

(13 reference statements)

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“…The simulation parameters of the pot model were calibrated between the pot and the steel plate [32]. The pot-soil restitution coefficient, the pot-soil static friction coefficient the pot-soil rolling friction coefficient, and the surface energy were used as test factors With the actual collision impact force and matrix loss rate as the target, a 4-factor, 3-leve orthogonal test was designed.…”

Section: Simulation Test Design Of the Pot-soil Parameter Calibrationmentioning

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: Simulation Test Design Of the Pot-soil Parameter Calibrationmentioning

confidence: 99%

Establishment of the Interaction Simulation Model between Plug Seedlings and Soil

Zeng,

Cui,

et al. 2023

Agronomy

Self Cite

View full text Add to dashboard Cite

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“…The discrete unit method is widely used in our industry [19][20][21][22][23], agriculture [24][25][26], and construction [27] as a reliable test method and tool [28]. In 1971, CUNDALL proposed a numerical simulation method to solve discontinuous media problems, the discrete element method (DEM), based on the theory of combining different instantons [29].…”

Section: Hertz-mindlin With Bonding V2 Contact Modelmentioning

confidence: 99%

Calibration and Modeling of Parameters for Kale Root Stubble Simulation Based on the Discrete Unit Method

Chen,

Jiang,

Liu

et al. 2023

Agronomy

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Today, the post-harvest root stubble treatment of kale in Hunan mostly uses manual pulling and centralized treatments, which are inefficient and labor-intensive. In this study, to realize the direct mechanical crushing of kale root stubble and return it to the field after harvesting, we established an accurate simulation model of kale root stubble by creating a model of the root stubble of kale and calibrating the parameters of the simulation. This study took Jingfeng No. 1 kale stubble as the research object and used EDEM2021.2 simulation software to study the parameters of the kale stubble-crushing simulation model. The peak shear force of the sheared kale root stubble was used as the test data, and the most significant factors affecting the shear force were screened out through the Plackett–Burman test for the Design-Expert design. In addition, the steepest climb test and Box–Behnken test were used to accurately assess the factor data to obtain the best simulation value, which was 861.02 N. The relative error between the simulated and measured values was 0.61%. Finally, an accurate simulation stubble model was established by combining the best simulation parameters with the measured stubble length and diameter. This model provides a theoretical basis and technical support for more in-depth research on stubble simulation and mechanized stubble return.

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Optimal Design of Ejector Belt Seedling Collecting Mechanism Based on Edem

CHEN,

ZHOU,

CHE

et al. 2023

INMATEH

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In the seedling extraction mechanism of the ejection type, because the ejector rod is in direct contact with the seedling substrate, the fragmentation rate of the seedling is high, the success rate is low, and the seedling effect is poor. In order to solve this problem, combined with the interaction between the ejector rod and the bowl seedling, this paper analyzes the working principle of the ejector rod conveyor belt seedling harvesting mechanism, and optimizes the design of the ejector rod conveyor belt seedling harvesting mechanism. By using the method of EDEM simulation analysis and orthogonal experiment, taking the breaking rate and success rate of bowl seedling as the test response index, the effects of ejector rod end form, ejector rod diameter and seedling extraction speed were studied, and the results were analyzed by range analysis and variance analysis to analyze the influence law of the interaction of various factors on bowl seedling extraction. The simulation results show that the crushing rate of bowl seedlings increases with the increase of seedling speed and the decrease of ejector diameter. Among the three different types of ejectors, the effect of round head ejector is the best. The best parameter combination of the seedling mechanism is the diameter of the ejector rod 10mm, the seedling speed 2m/s, and the ejector rod in the form of round head ejector rod. The verification experiment shows that the seedling extraction effect of the optimized seedling extraction mechanism is better than that of the original seedling extraction mechanism. The results show that when the best combination of working parameters is used to collect seedlings, the qualified rate of seedlings is not less than 90%, the fragmentation rate is not higher than 20%, and the seedling performance is relatively stable. The optimized seedling extraction mechanism can be used in the automatic dryland bowl seedling transplanter to meet the operational requirements of the automatic transplanter.

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Calibration of the Discrete Element Parameters and Experimental Verification of the Oil Sunflower Plug Seedling Pots

Cited by 4 publications

References 24 publications

Establishment of the Interaction Simulation Model between Plug Seedlings and Soil

Establishment of the Interaction Simulation Model between Plug Seedlings and Soil

Calibration and Modeling of Parameters for Kale Root Stubble Simulation Based on the Discrete Unit Method

Optimal Design of Ejector Belt Seedling Collecting Mechanism Based on Edem

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