Optimization and Testing of Seed Box Parameters of Potato Planters Based on Seed Potato Group Motion Simulation

2021 ◽  
Vol 65 (1) ◽  
pp. 39-50
Author(s):  
Hui Cai ◽  
Xin Luo ◽  
Bin Hu ◽  
Haomeng He ◽  
Feng Pan
Keyword(s):  
Discrete Element Method ◽  
Seed Potato ◽  
Inclination Angle ◽  
Structural Parameters ◽  
Discrete Element ◽  
Bench Test ◽  
Bottom Surface ◽  
List Type ◽  
Potato Planter ◽  
Element Method

HighlightsThe structural parameters of the seed box of a cup-belt potato planter were optimized.The arching phenomenon of seed potato in the reseeding box was reduced.The qualified rate of cup-belt potato planters in field operation was improved.Abstract. To solve the problem of missed sowing caused by the arching phenomenon of seed potato in the reseeding box of a cup-belt potato planter, this study used the discrete element method to analyze the seed potato movement in the seed box. The analysis revealed unreasonable structural parameters of the seed box. Therefore, the discrete element method was used to optimize the structural parameters of the seed box. First, the structural parameters of the seed box were analyzed by single-factor analysis, and then quadratic rotation orthogonal combination simulation tests of three factors and five levels were performed. Two evaluation indexes were established to evaluate the flow performance of the seed box: the amount of seed taken minus the amount of seed replenishment (CD), and the coefficient of variation of the average seed-population velocity in the reseeding box (CV). The best factor combination was found through optimization. With a 42° inclination angle of the bottom surface of the seed box (a), 145 mm reserved height of the seed isolation baffle (h), and 100° inclination angle of the seed isolation baffle (ß), the CD was 2.622 grains, and the CV was 22.887%. With these parameters, the mobility of seed potato in the reseeding box was good, and there was no arching in the reseeding box. To verify the accuracy of the optimized results, a cup-belt potato seeding test bench was built to conduct verification tests. The bench test verified the rationality of the model and the optimized parameters. Field tests showed that the arching phenomenon in the reseeding box was solved by optimizing the structural parameters of the seed box. The purpose of improving the sowing performance of the cup-belt potato planter was achieved. Keywords: Agricultural machinery, Discrete element method, Parameter optimization, Potato planter, Seed box.

Numerical simulation of particle screening efficiency of large multi-layer vibrating screen based on discrete element method

2021 ◽  
pp. 095440892110606
Author(s):  
Yujia Li ◽  
Peng Zhao ◽  
Li Mo ◽  
Tao Ren ◽  
Minghong Zhang
Keyword(s):  
Discrete Element Method ◽  
Environmental Protection ◽  
Inclination Angle ◽  
Discrete Element ◽  
Physical Parameters ◽  
Screening Process ◽  
Efficient Operation ◽  
Vibrating Screen ◽  
Screening Efficiency ◽  
Element Method

With the increasing requirements for energy conservation and environmental protection, multi-layer vibrating screens have become hot issues. Compared with single-layer vibrating screens, multi-layer vibrating screens has much better performance in terms of processing effect, treatment capacity, and environmental protection. The research on the physical parameters of the multi-layer vibrating screen is of great significance to the actual production. However, analysis and simulation studies of multi-layer vibrating screens are limited. In this paper, the screening process of wet particles on a multi-layer vibrating screen was simulated by using the discrete element method. The characteristics and application scope of the two vibration modes were analyzed. The particle penetration rate, the number of collisions, and the distribution of the particles under 23 combinations of structures and vibration parameters were investigated. The influence of different parameters on screening performance was analyzed. Several optimal combinations of frequency, amplitude and screen inclination angle under different working conditions were obtained. The screening efficiency of the balanced elliptic motion is higher than that of the linear motion. The best combination of the three parameters is 4 mm amplitude, 20 Hz frequency, and 3° inclination angle. The efficiency is higher when the particles follow a distribution of arithmetic on the screen. This study provides a reference for the efficient operation and optimal design of large multi-layer screening equipment.

scholarly journals Computer Aided Modeling of Wood Chips Transport by Means of a Belt Conveyor with Use of Discrete Element Method

2020 ◽  
Vol 10 (24) ◽  
pp. 9091
Author(s):  
Łukasz Gierz ◽  
Łukasz Warguła ◽  
Mateusz Kukla ◽  
Krzysztof Koszela ◽  
Tomasz Szymon Zwiachel
Keyword(s):  
Discrete Element Method ◽  
Analytical Model ◽  
Inclination Angle ◽  
Numerical Test ◽  
Discrete Element ◽  
Conveyor Belt ◽  
Wood Chips ◽  
Belt Conveyor ◽  
Belt Speed ◽  
Element Method

The effectiveness and precision of transporting wood chips on the transport trailer or hopper depends on an inclination angle, a conveyor belt speed, and length. In order to devise a methodology aiding designing and the selection of technical and performance parameters (aiding the settings of conveyor belt sub-assemblies), the authors carried out the simulation tests concerning wood chips transport on the belt conveyor and their outlet. For the purposes of these tests, a simulation model was performed in the Rocky DEM (discrete element method) software in the numerical analysis environment and compared to analytical tests. The tested wood chips were taken from cherry plum branches chipping processes (Prunus cerasifera Ehrh. Beitr. Naturk. 4:17. 1789 (Gartenkalender 4:189-204. 1784)), out of which seven basic fractions were separated, which differed mainly in terms of their diameter from 5 mm to 50 mm and the length of 150 mm. The article presents the results of wood chips ejection distance in the form of the 3D functions of wood chips ejection distance depending on the conveyor belt inclination angle and belt speed. The results are presented for five conveyor belt lengths (1 m, 2 m, 3 m, 4 m, 5 m). The tests also involved the conveyor belt inclination angle in the range from 10° to 50° and the belt velocity in the range from 1 m/s2 to 5 m/s2. The numerical test results demonstrate higher average values of wood chips ejection distance than designated in the analytical model. The average arithmetical difference in the results between the numerical and analytical model is at the level of 13%.

scholarly journals Mechanical analysis and research of the conveyor belt of plane turning belt conveyor based on Discrete Element Method

2017 ◽  
Vol 41 (1) ◽  
pp. 55-62
Author(s):  
De-yong Li ◽  
Shuang Wang ◽  
Kun Hu
Keyword(s):  
Discrete Element Method ◽  
Inclination Angle ◽  
Turning Point ◽  
Elevation Angle ◽  
Load Condition ◽  
Discrete Element ◽  
Conveyor Belt ◽  
Design Parameters ◽  
Belt Conveyor ◽  
Element Method

In view of the size and the change of the load force of the conveyor belt at the turning point of the plane turning belt conveyor, the influencing factors of the stress of the conveyor belt at the turning point of the plane turning belt conveyor under full load condition are analyzed. A three dimensional model of the turning point of the plane turning belt conveyor is established. Combined with previous research experience, the formula for calculating the load is put forward. Based on discrete element method, multiple sets of internal curve elevation angle and the belt speed are used for dynamic simulation analysis. The results showed that the middle of conveyor belt is the most stressed, the lateral force second, the force of the inner conveyor belt is the least. Outside force increases with the increase of speed; there is no change in the middle band; the inner band force decreases with the increase of the velocity. Outside force decreases with the decrease of the inclination angle. With the change of the inclination angle, the force is basically unchanged. With the decreasing of the inclination angle, the force increases gradually. By optimizing the design parameters of the plane turning belt conveyor, the force of belt is reduced, and the service life of belt is improved.

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization

2021 ◽  
Vol 910 ◽  
Author(s):  
Yiyang Jiang ◽  
Yu Guo ◽  
Zhaosheng Yu ◽  
Xia Hua ◽  
Jianzhong Lin ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Dynamics Analyses ◽  
Element Method

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