生菜种子物理接触参数测定与离散元仿真标定

doi:10.3969/j.issn.1004-1524.20230649

浙江农业学报 ›› 2024, Vol. 36 ›› Issue (4): 932-942.DOI: 10.3969/j.issn.1004-1524.20230649

生菜种子物理接触参数测定与离散元仿真标定

孔德¹^,²(), 叶自然², 谭向峰², 代梦迪², 赵先亮¹^,^*(), 孔德栋²^,^*

1.浙江科技大学生物与化学工程学院,浙江杭州 310023
2.浙江省农业科学院数字农业研究所,浙江杭州 310021

收稿日期:2023-05-18 出版日期:2024-04-25 发布日期:2024-04-29
作者简介:孔德(1998—),男,河北石家庄人,硕士,主要从事农业机械自动化研究。E-mail:222103855025@zust.edu.cn
通讯作者: 孔德栋,E-mail:ntzx@zju.edu.cn;赵先亮,E-mail: xlzhao@zust.edu.cn
基金资助:
浙江省“领雁”研发攻关计划项目(2022C02039)

Measurement of physical contact parameters and discrete element simulation calibration of lettuce seeds

KONG De¹^,²(), YE Ziran², TAN Xiangfeng², DAI Mengdi², ZHAO Xianliang¹^,^*(), KONG Dedong²^,^*

1. School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023,China
2. Institute of Digital Agriculture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021,China

Received:2023-05-18 Online:2024-04-25 Published:2024-04-29
Contact: KONG De,ZHAO Xianliang,KONG Dedong

摘要/Abstract

摘要：

当前工厂化生菜生产播种环节自动化程度较低,设计适用生菜种子播种的自动播种机需要进行仿真模拟。为提高生菜种子在颗粒仿真软件EDEM中运动的准确性,对生菜种子的物理参数和接触参数进行试验测定。以测定的种堆休止角为验证标准,对显著影响参数标定优化。通过物理试验的方法测定生菜种子的基本物理特性和接触参数的范围区间,利用Plackett-Burman试验在多因子中快速筛选出对响应变量(种堆休止角)有显著性影响的参数。设计最陡爬坡试验缩小3个显著性参数取值范围,确定低、中、高三个水平。利用Box-Behnken试验得到二阶回归方程,以测定的种堆休止角为标准进行求解,获得生菜种子EDEM离散元仿真参数的最佳组合。最终通过独立样本T检验,验证了参数的准确性。结果表明,标定的最优参数可用于生菜种子在存种盘中振动过程离散元仿真,也可以为育苗精量播种机流固耦合的颗粒参数设定提供参考。

关键词: 生菜种子, 参数标定, 离散元, 休止角

Abstract:

The current level of automation in the sowing process of industrialized lettuce production is relatively low, and designing an automatic seeder suitable for lettuce seed sowing requires simulation. To improve the accuracy of lettuce seed movement in particle simulation software EDEM, the physical parameters and contact parameters of lettuce seeds were tested. The measured angle of repose of seed pile was used as the validation standard to optimize the calibration of significant impact parameters. By using physical experiments to determine the basic physical properties and range of contact parameters of lettuce seeds, Plackett-Burman test was used to quickly screen out parameters that have a significant impact on the angle of repose of seed pile among multiple factors. Design the steepest climbing test to narrow the range of three significant parameters and determine the three levels of low, medium and high. Then, a second-order regression equation was obtained using the Box-Behnken test, and solved using the measured angle of repose of seed pile as the standard to obtain the optimal combination of EDEM discrete element simulation parameters for lettuce seeds. Finally, the accuracy of the parameters was verified through independent sample T-test. The results indicate that the calibrated optimal parameters can be used for discrete element simulation of the vibration process of lettuce seeds in the seed storage tray, and can also provide reference for the particle parameter setting of fluid solid coupling in precision seedling seeders.

Key words: lettuce seed, parameter calibration, discrete element, angle of repose

中图分类号:

S351.1

孔德, 叶自然, 谭向峰, 代梦迪, 赵先亮, 孔德栋. 生菜种子物理接触参数测定与离散元仿真标定[J]. 浙江农业学报, 2024, 36(4): 932-942.

KONG De, YE Ziran, TAN Xiangfeng, DAI Mengdi, ZHAO Xianliang, KONG Dedong. Measurement of physical contact parameters and discrete element simulation calibration of lettuce seeds[J]. Acta Agriculturae Zhejiangensis, 2024, 36(4): 932-942.

图/表 17

参考文献 31

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参数Parameters	平均值Mean value
三轴尺寸(长×宽×厚)Three axis dimensions (length×width×thickness)/mm×mm×mm	3.747×1.059×0.547
千粒重1 000 grain weight/g	1.144
密度Density/(kg·m^-3)	1 650

参数Parameters	平均值Mean value
三轴尺寸(长×宽×厚)Three axis dimensions (length×width×thickness)/mm×mm×mm	3.747×1.059×0.547
千粒重1 000 grain weight/g	1.144
密度Density/(kg·m^-3)	1 650

指标Index	1	2	3	4	5	6
厚度形变量ΔN	0.2	0.16	0.2	0.16	0.21	0.19
Thickness deformation ΔN/mm
宽度形变量ΔM	0.18	0.07	0.16	0.09	0.16	0.05
Width deformation ΔM/mm

指标Index	1	2	3	4	5	6
厚度形变量ΔN	0.2	0.16	0.2	0.16	0.21	0.19
Thickness deformation ΔN/mm
宽度形变量ΔM	0.18	0.07	0.16	0.09	0.16	0.05
Width deformation ΔM/mm

仿真参数 Simulation parameters	低水平 Low level(-1)	高水平 Hight level(+1)
生菜种子泊松比Poisson’s ratio of lettuce seed (A)	0.1	0.4
生菜种子剪切模量Shear modulus of lettuce seed (B)/MPa	3.9	6.5
生菜种子-生菜种子恢复系数Lettuce seed-lettuce seed restitution coefficient (C)	0.10	0.24
生菜种子-生菜种子静摩擦系数Lettuce seed-lettuce seed static friction coefficient (D)	0.37	0.58
生菜种子-生菜种子滚动摩擦系数Lettuce seed-lettuce seed rolling friction coefficient (E)	0.10	0.32
生菜种子-Q345碰撞恢复系数Lettuce seed-Q345 restitution coefficient (F)	0.30	0.41
生菜种子-Q345静摩擦系数Lettuce seed-Q345 static friction coefficient (G)	0.35	0.46
生菜种子-Q345滚动摩擦系数Lettuce seed-Q345 rolling friction coefficient (H)	0.01	0.28
虚拟参数Virtual parameter (J~L)	-1	+1

生菜种子物理接触参数测定与离散元仿真标定

Measurement of physical contact parameters and discrete element simulation calibration of lettuce seeds

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序号 No.	仿真参数								休止角 Repose angle (θ)/(°)
序号 No.	A	B	C	D	E	F	G	H	休止角 Repose angle (θ)/(°)
1	+1	+1	-1	+1	+1	+1	-1	-1	45.817
2	-1	+1	+1	-1	+1	+1	+1	-1	42.151
3	+1	-1	+1	+1	-1	+1	+1	+1	44.119
4	-1	+1	-1	+1	+1	-1	+1	+1	48.106
5	-1	-1	+1	-1	+1	+1	-1	+1	37.111
6	-1	-1	-1	+1	-1	+1	+1	-1	43.129
7	+1	-1	-1	-1	+1	-1	+1	+1	36.871
8	+1	+1	-1	-1	-1	+1	-1	+1	32.005
9	+1	+1	+1	-1	-1	-1	+1	-1	37.151
10	-1	+1	+1	+1	-1	-1	-1	+1	39.028
11	+1	-1	+1	+1	+1	-1	-1	-1	54.726
12	-1	-1	-1	-1	-1	-1	-1	-1	29.396

参数 Parameters	自由度 Degree of freedom	平方和 Sum of squares	F值 F-value	P值 P-value
A	1	11.54	7.33	0.113 7
B	1	8.87	5.63	0.141 0
C	1	55.43	35.20	0.027 3^*
D	1	152.66	96.95	0.010 2^*
E	1	53.06	33.69	0.028 4^*
F	1	8.65	5.49	0.143 8
G	1	15.06	9.56	0.090 6
H	1	1.16	0.738 2	0.480 8

序号 No.	生菜种子-生菜种子恢复系数 Lettuce seed-lettuce seed restitution coefficient (C)	生菜种子-生菜种子静摩擦系数 Lettuce seed-lettuce seed static friction coefficient (D)	生菜种子-生菜种子滚动摩擦系数 Lettuce seed-lettuce seed rolling friction coefficient (E)	休止角 Repose angle (θ)/(°)	相对误差 Relative error/%
1	0.100	0.370	0.100	31.192	12.36
2	0.128	0.412	0.144	33.755	5.16
3	0.156	0.454	0.188	36.801	3.40
4	0.184	0.496	0.232	38.307	7.63
5	0.212	0.538	0.276	44.334	24.82
6	0.240	0.580	0.320	46.705	31.23

序号 No.	生菜种子-生菜种子Lettuce seed-lettuce seed			休止角 Repose angle (θ)/(°)
序号 No.	恢复系数 restitution coefficient (C)	静摩擦系数 static friction coefficient (D)	滚动摩擦系数 rolling friction coefficient (E)	休止角 Repose angle (θ)/(°)
1	0.128	0.412	0.188	32.954
2	0.184	0.412	0.188	34.251
3	0.128	0.496	0.188	37.154
4	0.184	0.496	0.188	38.053
5	0.128	0.454	0.144	33.426
6	0.184	0.454	0.144	34.239
7	0.128	0.454	0.232	35.099
8	0.184	0.454	0.232	36.604
9	0.156	0.412	0.144	31.114
10	0.156	0.496	0.144	36.375
11	0.156	0.412	0.232	34.787
12	0.156	0.496	0.232	37.057
13	0.156	0.454	0.188	35.723
14	0.156	0.454	0.188	35.564
15	0.156	0.454	0.188	35.792
16	0.156	0.454	0.188	35.664
17	0.156	0.454	0.188	35.591

方差源 Source of variance	平方和 Sum of squares	自由度 Degree of freedom	均方 Mean square	P值 P-value
模型Model	46.630 0	9	5.180 0	0.000 1^**
C	2.550 0	1	2.550 0	0.000 1^**
D	30.160 0	1	30.160 0	0.000 1^**
E	8.810 0	1	8.810 0	0.000 1^**
CD	0.039 6	1	0.039 6	0.100 1
CE	0.119 7	1	0.119 7	0.013 3^*
DE	2.240 0	1	2.240 0	0.000 1^**
C²	0.003 2	1	0.003 2	0.607 6
D²	0.005 5	1	0.005 5	0.501 7
E²	2.680 0	1	2.680 0	0.000 1^**
残差Residual	0.077 3	7	0.011 0
失拟项Lack of fit	0.042 2	3	0.014 1	0.322 7
纯误差Pure error	0.035 2	4	0.008 8
总和Sum	46.710 0	16

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