Simulation and optimization analysis and experiment of split plough based on discrete element method

doi:10.3969/j.issn.1004-1524.2022.11.23

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (11): 2542-2552.DOI: 10.3969/j.issn.1004-1524.2022.11.23

• Biosystems Engineering • Previous Articles Next Articles

Simulation and optimization analysis and experiment of split plough based on discrete element method

LIU Mingyong¹^,²(), HU Chenglong¹^,²^,^*(), XIE Bolin¹^,²

1. Hubei University of Technology, Wuhan 430068, China
2. Hubei Agricultural Machinery Engineering Research and Design Institute, Wuhan 430068, China

Received:2021-06-14 Online:2022-11-25 Published:2022-11-29
Contact: HU Chenglong

Abstract

Abstract:

To reduce the resistance of the plough body and improve the efficiency of farming, based on EDEM, the study was carried out on the basis of the parabolic curved plough body. The plough body cultivation process was simulated and analyzed, and the disturbance behavior of the soil particles was observed. The influence of the blade angle, the installation angle and the working speed on the plough body’s tillage resistance was analyzed, and the ideal plough body parameters were obtained. The results showed that compared with the parabolic surface, the resistance of the elliptical surface was 1 591.551 N in the relatively stable stage, reduced by 4.4% compared with the parabolic surface, and had a better effect on soil uplift. Single factor analysis was carried out on the forward speed, blade angle and installation angle of the plough body. When the installation angle was 25°, the resistance of the plough body was the smallest. As the blade angle increased, the resistance of the plough body also increased. Therefore, a lower forward speed and blade angle should be selected within a suitable range to reduce the resistance of the plough body.

Key words: moldboard plough, plough resistance, soil disturbance, directrix, discrete element

CLC Number:

S222.121

LIU Mingyong, HU Chenglong, XIE Bolin. Simulation and optimization analysis and experiment of split plough based on discrete element method[J]. Acta Agriculturae Zhejiangensis, 2022, 34(11): 2542-2552.

Figures/Tables 21

Fig.1 Schematic diagram of horizontal straight line method

Table 1 Equation of guide curve

类型 Type	方程 Equation
圆弧 Arc	$\{\begin{array}{l} x = - 248.46 + 252.26 \cdot c o s θ \\ y = 436.81 + 252.26 \cdot s i n θ \end{array}$
摆线 Cycloid	$\{\begin{array}{l} x (t) = 265.5 \cdot (1 - s i n t) \\ y (t) = 298 \cdot (1 - c o s t) \end{array}$ 0≤t≤1.46
椭圆 Oval	$\{\begin{array}{l} x = 201.34 \cdot c o s θ \\ y = 62.19 \cdot s i n θ \end{array}$

Table 1 Equation of guide curve

类型 Type	方程 Equation
圆弧 Arc	$\{\begin{array}{l} x = - 248.46 + 252.26 \cdot c o s θ \\ y = 436.81 + 252.26 \cdot s i n θ \end{array}$
摆线 Cycloid	$\{\begin{array}{l} x (t) = 265.5 \cdot (1 - s i n t) \\ y (t) = 298 \cdot (1 - c o s t) \end{array}$ 0≤t≤1.46
椭圆 Oval	$\{\begin{array}{l} x = 201.34 \cdot c o s θ \\ y = 62.19 \cdot s i n θ \end{array}$

Fig.2 Lead curve graph

Table 2 Plough body parameter table

参数 Parameter	单位 Unit	数值 Value
耕宽 Farming width	mm	285
胫刃线高 Shin line height	mm	300
顶边线最大高度	mm	367
Maximum height of top edge
翼边线夹角 Wing edge angle	°	35
导曲线直线段长	mm	105
Length of straight line of guide curve
安装角 Installation angle	°	30
切线夹角 Tangent angle	°	115

Table 3 Straight element line and surface element line angle

直元线高度 Straight element line height/mm	元线角 Element line angle/(°)
0	46.0
50	46.5
75	47.8
125	51.2
175	52.3
225	55.8
275	57.0
325	61.5
360	46.5

Fig.3 3D model diagram of plough body a, Three-dimensional model; b, Front view of plough body A tillage width; h, Shin edge line height; H, Top edge line maximum height; θ, Wing edge line included angle.

Fig.4 Particle model

Fig.5 Experimental test instrument a, SL-TSD soil tester; b, ZJ type stepless speed regulation strain control direct shear instrument.

Fig.6 Diagram of shear strength and vertical load a, Shear stress and shear displacement change curve; b, Fitting curve.

Table 4 The simulation parameters

项目 Item	数值 Value
犁体密度 Density of plough/(kg·m^-3)	7 865
犁体剪切模量 Shear modulus of plough/Pa	7×10⁷
犁体泊松比 Poisson’s ratio of plough	0.3
土壤颗粒密度Density of soil particles/(kg·m^-3)	2 680
土壤剪切模量Shear modulus of soil/Pa	2.5×10⁷
土壤泊松比 Poisson’s ratio of soil	0.33
土壤颗粒半径Radius of soil particle/mm	3-5
土壤-土壤静摩擦因数	0.5
Coefficient of friction of soil-soil
土壤-犁静摩擦因数Coefficient of friction of soil-plough	0.3
土壤-土壤动摩擦因数	0.05
Coefficient of rolling friction of soil-soil
土壤-犁动摩擦因数	0.25
Coefficient of rolling friction of soil-plough
土壤-土壤恢复系数	0.6
Coefficient of restitution of soil-soil
土壤-犁恢复系数	0.2
Coefficient of restitution of soil-plough
耕深 Farming depth/mm	225
耕宽 Farming width/mm	285

Fig.7 EDEM simulation model

Fig.8 Plough body movement process a, Vertical distribution; b, Horizontal distribution.

Fig.9 Soil disturbance maps of different types of plough bodies a, Parabolic curved surface longitudinal soil disturbance; b, Elliptical curved surface longitudinal soil disturbance; c, Parabolic curved surface lateral soil disturbance; d, Elliptical curved surface lateral soil disturbance; The number of particles above the surface was marked in Fig. a; The height of uplift is marked in Fig.b.

Fig.10 Soil movement state of different types of plough bodies a, Parabolic surface soil particle velocity distribution status; b, Parabolic surface soil particle velocity direction distribution status; c, Elliptical surface soil particle velocity distribution status; d, Elliptical surface soil particle velocity direction distribution status.

Fig.11 Plough resistance diagram

Fig.12 Velocity and drag relationship

Fig.13 Relationship between installation Angle and resistance

Fig.14 Relationship between blade angle and resistance

Fig.15 The plough body model a, Parabolic surface model; b, Elliptical surface model.

Fig.16 Laboratory equipment a, Experimental schematic diagram; b, Experimental site diagram.

Fig.17 Comparison diagram of simulation and experiment

References 17

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Simulation and optimization analysis and experiment of split plough based on discrete element method

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