基于离散元的设施农业就地翻土犁的研究与试验

doi:10.13229/j.cnki.jdxbgxb.20220687

Abstract

Abstract:

In view of the problem that the arable plough could not be used for deep ploughing due to the narrow space of facility agriculture and the serious soil diseases and insect pests， a method of turning soil on the spot was put forward.Based on the reverse engineering， the reverse surface of the plough body of the local soil turning plough was obtained. Based on the existing forming principle of the plough body， the forward surface of the plough body of the share plough body was established by referring to the ploughing width， ploughing depth， installation angle of the plough body， soil cutting angle， guiding curve lifting angle， opening and length of the plough body.The soil relative humidity was 34.57% and the soil accumulation angle was 39°. The contact parameter range was obtained by GEMM， the contact parameter database of EDEM software. The surface energy between soil particles was 4.19 J/m²， the collision recovery coefficient was 0.282， the dynamic friction coefficient was 0.051， and the static friction coefficient was 0.629.The concept of soil fall rate in original gully was introduced. The interaction model between soil fall rate and surface parameters was established， and the optimal surface parameters of soil fall rate were obtained.Using Design-Expert software， plackett-Burman experimental design method was used to carry out multi-factor and two-level significance screening test with soil fall rate as the response index. Three significant factors affecting soil fall rate of the original ditch were obtained， namely， plow width， plowshare installation angle and soil cutting angle.Box-Behnken experimental design was carried out for the three factors， and the optimal design parameters of 278.392 mm plow width， 40.522°plow share installation angle and 23.211°soil cutting angle were obtained.Based on the optimized results， the error between the experimental results and the predicted results is 3.13%. The experimental results show that the tilling plow can achieve the aim of tilling in situ， and provide a reference for solving the problem of soil deep tilling in facility agriculture.

Key words: agricultural engineering, in-situ tilling plow, orthogonal test, soil falling rate of original ditch, physical test

CLC Number:

S222.19

Yuan-yi LIU,Sheng-jie YU,Bei XU,Xian-liang WANG,Fa-cheng SONG. Experimental study on in-situ tilling plow in facility agriculture based on discrete element method[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(4): 1153-1165.

Figures/Tables 22

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Table 1

Table 2

Table 3

Analysis of variance of stacking angle experimental design"

方差来源	平方和	自由度	均方	F值	P值	显著性
模型	3977.01	14	284.07	10.95	<0.0001	**
X₁	992.08	1	992.08	38.23	<0.0001	**
X₂	1856.30	1	1 856.30	71.54	<0.0001	**
X₃	349.06	1	348.06	13.45	0.0025	*
X₄	8.17	1	8.17	0.31	0.5836
X₁X₂	48.65	1	48.65	1.87	0.1925
X₁X₃	4.06	1	4.06	0.16	0.6984
X₁X₄	3.82	1	3.82	0.15	0.7069
X₂X₃	6.71	1	6.71	0.26	0.6191
X₂X₄	0.023	1	0.023	8.671E-004	0.9769
X₃X₄	10.21	1	10.21	0.39	0.5406
X $12$	5.34	1	5.34	0.21	0.6571
X $22$	676.45	1	676.45	26.07	0.0002	*
X $32$	13.75	1	13.75	0.53	0.4787
X $42$	0.70	1	0.70	0.027	0.8719
残差	363.26	14	25.95
失拟项	335.47	10	33.55	4.83	0.0713
误差项	27.79	4	6.95
总和	4340.27	28

Table 3

Fig.7

Fig.8

Fig.9

Fig.10

Table 4

Fig.11

Table 5

Table 6

Table 7

Table 8

Table 9

Fig.12

Fig.13

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因素	-1	0	1
X₁/（J·m^-2）	4	6	8
X₂	0.15	0.35	0.55
X₃	0.05	0.075	0.1
X₄	0.32	0.74	1.16

序号	X₁/（J·m^-2）	X₂	X₃	X₄	堆积角/（°）
1	8	0.55	0.075	0.74	33.70
2	6	0.35	0.050	0.32	42.64
3	4	0.55	0.075	0.74	22.80
4	8	0.35	0.100	0.74	66.17
5	4	0.35	0.100	0.74	42.00
6	4	0.15	0.075	0.74	53.00
7	4	0.35	0.075	1.16	36.65
8	6	0.35	0.075	0.74	48.77
9	4	0.35	0.050	0.74	28.98
10	6	0.55	0.075	1.16	26.04
11	6	0.15	0.050	0.74	48.73
12	6	0.15	0.075	1.16	52.60
13	4	0.35	0.075	0.32	37.98
14	6	0.35	0.075	0.74	53.41
15	8	0.15	0.075	0.74	49.95
16	6	0.55	0.100	0.74	32.07
17	8	0.35	0.075	0.32	60.47
18	6	0.35	0.075	0.74	49.09
19	6	0.15	0.100	0.74	54.17
20	8	0.35	0.075	1.16	63.05
21	6	0.35	0.075	0.74	54.13
22	6	0.55	0.050	0.74	21.45
23	6	0.35	0.100	0.32	59.16
24	8	0.35	0.050	0.74	57.18
25	6	0.35	0.050	1.16	42.43
26	6	0.55	0.075	0.32	28.06
27	6	0.35	0.075	0.74	49.10
28	6	0.15	0.075	0.32	54.92
29	6	0.35	0.100	1.16	52.56

因素	编码	低水平（-）	高水平（+）
耕深/mm	X₁	200	250
耕作幅宽/mm	X₂	228	312
犁铧安装角/（°）	X₃	35	45
切土角/（°）	X₄	25	30
导曲线提升角/（°）	X₅	19.52	29.06
开度/mm	X₆	140	190
犁体长度/mm	X₇	525.6	642.4

序号	X₁/mm	X₂/mm	X₃/（°）	X₄/（°）	X₅/（°）	X₆/mm	X₇/mm	X₈/（km·h^-1）	X₉	X₁₀	X₁₁	原沟落土率/%
1	250	312	35	30	29.06	190	525.6	4.5	-1	1	-1	80.67
2	200	312	45	25	29.06	190	642.4	4.5	-1	-1	1	78.12
3	250	228	45	30	19.52	190	642.4	7	-1	-1	-1	79.48
4	200	312	35	30	29.06	140	642.4	7	1	-1	-1	78.44
5	200	228	45	25	29.06	190	525.6	7	1	1	-1	81.69
6	200	228	35	30	19.52	190	642.4	4.5	1	1	1	79.89
7	250	228	35	25	29.06	140	642.4	7	-1	1	1	81.20
8	250	312	35	25	19.52	190	525.6	7	1	-1	1	83.65
9	250	312	45	25	19.52	140	642.4	4.5	1	1	-1	77.53
10	200	312	45	30	19.52	140	525.6	7	-1	1	1	73.45
11	250	228	45	30	29.06	140	525.6	4.5	1	-1	1	80.55
12	200	228	35	25	19.52	140	525.6	4.5	-1	-1	-1	83.48

因素	效应	系数	标准误差	贡献值	平方和	是否显著
截距		79.85	0.22
X₁	1.34	0.67	0.22	6.26	5.35	否
X₂	-2.40	-1.20	0.22	20.31	17.35	是
X₃	-2.75	-1.38	0.22	26.58	22.72	是
X₄	-2.20	-1.10	0.22	16.97	14.50	是
X₅	0.53	0.27	0.22	0.99	0.85	否
X₆	1.48	0.74	0.22	7.64	6.53	否
X₇	-1.47	-0.74	0.22	7.60	6.50	否
X₈	-0.39	-0.19	0.22	0.53	0.45	否
X₉	0.89	0.45	0.22	2.79	2.39	否
X₁₀	-1.55	-0.77	0.22	8.42	7.19	否
X₁₁	-0.74	-0.37	0.22	1.91	1.64	否

Experimental study on in-situ tilling plow in facility agriculture based on discrete element method

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