A General Modelling Approach for Coated Cotton-Seeds 
Based on the Discrete Element Method

Wang, Long; Hu, Can; He, Xiaowei; Guo, Weihua; Wang, Xufeng; ShuLin, Hou

doi:10.35633/inmateh-63-22

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…Therefore, according to the fact that the diameter of the commonly used metering wheel on the market is generally between 350 mm and 420 mm, the previous research of the project team and only the semicircle of the auxiliary wheel and the metering wheel is wrapped by the crawler, the diameter of the corresponding metering wheel and the auxiliary wheel of the device is set to 370 mm. According to the agronomic requirements and the common size of the current cotton dibbler, the cotton plant spacing was selected as 100 mm according to the reference [12][13][14]. It can be seen from Figure 2 that the number of duck bill that the track always contacts with the ground is 7, and the contact length between the track and the ground during the operation of the machine is always 700 mm.…”

Section: Structural Design Of Critical Componentmentioning

confidence: 99%

Numerical Simulation and Bench Test of Crawler-Type Cotton Time-Delay Hole-Forming Device Based on RecurDyn-EDEM Coupling

Pan,

Chen,

Zhang

et al. 2024

Preprint

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Addressing the significant challenge in high-speed cotton dibbling operations in Xinjiang—specifically, the duck bill’s ("Duck bill" is a type of duck-billed bunch planting mechanism or component). shortened opening duration leading to seed throwing and floating—a new crawler-type delayed hole-forming mechanism has been designed. This mechanism extends the duck bill horizontally, thereby prolonging its opening time, enabling cotton sowing speeds of up to 6 km/h. Following agronomic principles for cotton planting, the overall layout of the crawler-type hole-forming mechanism, the structural parameters of the key components and the trajectory of the hole-forming are determined. We use the Discrete Element Method (DEM) and multi-body dynamics coupling method to simulate and analyze the motion process of the device. The fixed the tilt angle of the duck bill α(A), the depth of the duck bill hole-forming into the soil h(B), and the angle of rotation of the moving duck bill β(C) were taken as the experimental factors, with the longitudinal length of cotton seed hole (Y1) and the hole-forming depth of cotton seed hole (Y2) as the response values. The parameter range of each factor and the preliminary influence on the response value were determined through pre-experiments and single-factor simulation test. Based on RecurDyn-EDEM coupling, a quadratic regression orthogonal rotation combination simulation test was carried out. The results show that the order of the primary and secondary factors affecting the Y1 of the time-lapse hole-forming device was: A > C > B. The order of primary and secondary factors affecting the Y2 of the delayed hole forming device was: B > C > A. When the A was 2.4 °, the B was 42.4 mm, and the C was 30.5 °, the performance of the hole-forming was the best, and the Y1 was 26.4 mm, and the Y2 was 25.0 mm. The bench verification test results show that under the optimized combination of operating parameters, the average Y1 was 29.1 mm, and the average Y2 was 23.2 mm. Compared with the results of the previous coupled simulation model, the average relative errors of the two are 7.23 % and 4.36 %, respectively, indicating the accuracy and effectiveness of the established DEM simulation model and virtual test analysis. The hole-forming area and the opening time of the duck bill after the stable operation of the machine were recorded and measured. The calculated hole dislocation rate Hc was 4.33 %, which did not exceed the national standard requirement of 6 %. The qualified rate of hole distance Hx was 94.33 %, which was much higher than the national standard requirement of 80 %. The average opening time of the duck bill at a speed of 6 km/h is 0.45 s, which is much longer than the time required for cotton seeds to fall from the duck bill 0.11 s. It meets the requirements of high-speed cotton planting in China and facilitating advancements in future high-speed planter technology.

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Section: Structural Design Of Critical Componentmentioning

confidence: 99%

Numerical Simulation and Bench Test of Crawler-Type Cotton Time-Delay Hole-Forming Device Based on RecurDyn-EDEM Coupling

Pan,

Chen,

Zhang

et al. 2024

Preprint

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“…Joash Bryan Adajar [31] carried out a variety of shear tests between field residues and soil and found that the relative error was less than 2% through the measurements of the stress-displacement and friction angle, which is a better observation of the interaction mechanism between the straw and the soil. The interaction mechanism between straw and soil, in addition to modeling for Panax ginseng, sunflower seeds, rice, wheat, and so on [32][33][34][35][36][37][38][39][40], can show their respective contact characteristics relatively well. Some application scenarios of the Hertz-Mindlin (no-slip) contact model are shown in Figure 4.…”

Section: 𝛽 = 𝑙𝑛𝑒mentioning

confidence: 99%

A Review of Contact Models’ Properties for Discrete Element Simulation in Agricultural Engineering

Zhao,

Wu,

Jiang

2024

Agriculture

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In agricultural engineering, the discrete element simulation of the operational structure, object of movement, and force has become a standard method of modern agricultural equipment design. The selection and development of an appropriate contact model are critical factors affecting the accuracy of the process of the simulation calculation of the movement and force. Understanding how to choose or establish suitable contact models according to different research fields, objects, and purposes has become the focus of present research. This paper gives an overview of contact models for discrete element simulation, summarizes and analyzes the simulation calculation basis of different contact models, and focuses on the application status and scenarios of different models at this stage. It analyzes and summarizes the selection basis and application fields of contact models. The next direction in the development of discrete element simulation contact models should be the hybrid application of multicontact models and the precise development of specialized contact models. It is necessary to establish a standardized parameter-calibration process for different contact models to guarantee the accuracy of the models, to improve the application of computer arithmetic, and to establish an efficient and accurate simulation contact model selection and application in the field of agricultural engineering. Efficient and accurate simulation contact model selection, design theory, and calculation processes will improve the efficiency of modern agricultural machinery design.

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“…Yunxia Wang, Fanyi Liu, and Tao Wu calibrated the discrete elemental model parameters of corn seeds, wheat, and clayey soil, respectively, based on angle of repose simulation experiments [6][7][8]; Xu Bing established a non-spherical particle model of buckwheat seeds using the auto-filling method and parameterized it using a discrete element model [9]. Wang Long designed a device to simultaneously determine the angle of repose and angle of accumulation of materials and calibrated the contact parameters of cotton seeds through physical and simulation tests [10]. Balevičius measured the static friction coefficient between pea and glass by sliding test [11].…”

Section: Introductionmentioning

confidence: 99%

Parameter Calibration of Discrete Element Model of Wine Lees Particles

Zhang,

Wang,

Wang

et al. 2024

Applied Sciences

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In order to investigate the contact characteristics of the mechanical parts of the brewing robot with wine lees particles, it is essential to calibrate the parameters of the discrete elemental model of wine lees particles. This paper proposes a method based on tests of the angle of repose. The simulation test is conducted to establish a regression model and combined with physical tests to find optimization. The contact model used in simulation modeling is Hertz-Mindlin with Johnson-Kendall-Roberts. Not all discrete element model parameters of wine lees particles have a significant impact on the angle of repose, so screening through Plackett-Burman Design is performed. The results indicate that the restitution coefficient between wine lees particles and restitution coefficient between wine lees particle and steel plate have a significant impact on angle of repose. Additionally, another parameter that is difficult to obtain, namely surface energy (JKR), also plays a crucial role. The optimal value interval for these three parameters is determined by the steepest ascent test, and a linear regression model for angle of repose is built through Box-Behnken Design. The optimal values obtained are as follows: restitution coefficient between wine lees particles—0.603; restitution coefficient between wine lees particle and steel plate—0.595; JKR—0.083. Finally, in order to verify the accuracy of calibrated parameters, simulation verification tests are carried out which show that there is only a relative error rate at 0.18% between simulated angle of repose and actual angle of repose, indicating that accurate calibration parameters were achieved. This study can provide reference for selecting discrete element model parameters for wine lees particles in future research endeavors.

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A General Modelling Approach for Coated Cotton-Seeds Based on the Discrete Element Method

Cited by 9 publications

References 13 publications

Numerical Simulation and Bench Test of Crawler-Type Cotton Time-Delay Hole-Forming Device Based on RecurDyn-EDEM Coupling

Numerical Simulation and Bench Test of Crawler-Type Cotton Time-Delay Hole-Forming Device Based on RecurDyn-EDEM Coupling

A Review of Contact Models’ Properties for Discrete Element Simulation in Agricultural Engineering

Parameter Calibration of Discrete Element Model of Wine Lees Particles

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