Calibration of Interparticle Contact Parameters of Kitchen Waste Composition Based on EDEM

doi:10.13304/j.nykjdb.2022.0601

Abstract

Abstract:

The complexity of kitchen waste raw materials leads to the problem that parameters are not easy to obtain in the simulation research of kitchen waste aerobic composting. This study calibrated the contact parameters of kitchen waste by combining physical accumulation test with EDEM simulation test. Plackett-Burman （P-B） test was used to screen the significance of 9 parameters to be calibrated. The results showed that the rolling friction coefficient between particles， Johnso-Kendall-Roberts （JKR） surface energy and the static friction coefficient between particles and geometry had significant effects on the stacking angle of kitchen waste. By using the climbing test and the Box-Behnken （B-B） test， the optimal value interval and the combination of the optimal values that significantly affected the parameters were obtained： the rolling friction coefficient of kitchen waste-kitchen waste was 0.11， the surface energy of JKR was 0.13 J·m^-2， the static friction coefficient of kitchen waste-stainless steel was 0.73. The simulation results showed that the average relative error was 4.3%， and the calibration of the contact parameters of kitchen waste was reliable. This study could provide reference for simulation research of kitchen waste treatment and resource utilization equipment.

Key words: kitchen waste, discrete element simulation, Johoson-Kendall-Roberts model, contact parameter calibration, repose angle

摘要：

餐厨垃圾原料复杂，导致其好氧堆肥原料混合过程仿真研究中存在参数不易获取的问题。该研究通过物理堆积试验与EDEM仿真试验结合的方法对餐厨垃圾接触参数进行了标定，通过Plackett-Burman（P-B）试验对9个待标定参数进行显著性筛选。结果表明，颗粒滚动摩擦系数、Johnso-Kendall-Roberts（JKR）表面能、颗粒与几何体间静摩擦系数对餐厨垃圾堆积角的影响显著；采用爬坡试验和Box-Behnken（B-B）试验，获得显著影响参数的最优值区间与最优值组合：餐厨垃圾-餐厨垃圾滚动摩擦系数为0.11、JKR表面能为0.13 J·m^-2、餐厨垃圾-不锈钢静摩擦系数为0.73。仿真试验验证结果平均相对误差为4.3%，说明标定餐厨垃圾接触参数具有可靠性。研究结果可为餐厨垃圾处理和资源化利用设备的仿真研究提供参考。

关键词: 餐厨垃圾, 离散元模拟, JKR模型, 接触参数标定, 堆积角

CLC Number:

S216

Miao YU, Haibin ZHOU, Jingtao DING, Hongsheng CHENG, Yujun SHEN, Shengyuan FAN, Xi ZHANG, Jian WANG, Pengxiang XU, Qiongyi CHENG. Calibration of Interparticle Contact Parameters of Kitchen Waste Composition Based on EDEM[J]. Journal of Agricultural Science and Technology, 2023, 25(12): 111-120.

于淼, 周海宾, 丁京涛, 程红胜, 沈玉君, 范盛远, 张曦, 王健, 徐鹏翔, 程琼仪. 基于EDEM的餐厨垃圾组成颗粒间接触参数标定[J]. 中国农业科技导报, 2023, 25(12): 111-120.

Figures/Tables 15

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参数符号 Parameter notation	参数 Parameter	参数水平 Parameter level
参数符号 Parameter notation	参数 Parameter	-1	0	+1
A	餐厨垃圾泊松比 Kitchen waste poisson’s ratio	0.250	0.325	0.400
B	餐厨垃圾剪切模量 Kitchen waste shear modulus/MPa	1.0	5.5	10.0
C	餐厨-餐厨碰撞恢复系数 Kitchen waste-kitchen waste restitution coefficient	0.35	0.55	0.75
D	餐厨-餐厨静摩擦系数 Kitchen waste-kitchen waste static friction coefficient	0.20	0.62	1.04
E	餐厨-餐厨滚动摩擦系数 Kitchen waste-kitchen waste rolling friction coefficient	0.05	0.10	0.15
F	餐厨-不锈钢碰撞恢复系数 Kitchen waste-stainless steel restitution coefficient	0.4	0.6	0.8
G	餐厨-不锈钢静摩擦系数 Kitchen waste-stainless steel static friction coefficient	0.50	0.75	1.00
H	餐厨-不锈钢滚动摩擦系数 Kitchen waste-stainless steel rolling friction coefficient	0.50	0.75	1.00
J	JKR表面能 JKR surface energy /（J·m^-2）	0.01	0.05	0.10

参数符号 Parameter notation	参数 Parameter	参数水平 Parameter level
参数符号 Parameter notation	参数 Parameter	-1	0	+1
A	餐厨垃圾泊松比 Kitchen waste poisson’s ratio	0.250	0.325	0.400
B	餐厨垃圾剪切模量 Kitchen waste shear modulus/MPa	1.0	5.5	10.0
C	餐厨-餐厨碰撞恢复系数 Kitchen waste-kitchen waste restitution coefficient	0.35	0.55	0.75
D	餐厨-餐厨静摩擦系数 Kitchen waste-kitchen waste static friction coefficient	0.20	0.62	1.04
E	餐厨-餐厨滚动摩擦系数 Kitchen waste-kitchen waste rolling friction coefficient	0.05	0.10	0.15
F	餐厨-不锈钢碰撞恢复系数 Kitchen waste-stainless steel restitution coefficient	0.4	0.6	0.8
G	餐厨-不锈钢静摩擦系数 Kitchen waste-stainless steel static friction coefficient	0.50	0.75	1.00
H	餐厨-不锈钢滚动摩擦系数 Kitchen waste-stainless steel rolling friction coefficient	0.50	0.75	1.00
J	JKR表面能 JKR surface energy /（J·m^-2）	0.01	0.05	0.10

方差来源 Variance source	效应 Effect	P值 P value	显著性排序 Significant ranking
模型Model	—	0.009 7^**	—
A	-0.56	0.290 0	6
B	0.12	0.810 0	9
C	0.52	0.321 0	7
D	-0.18	0.721 0	8
E	4.40	0.000 7^**	1
F	0.83	0.147 3	4
G	-1.64	0.023 5^*	3
H	0.78	0.165 2	5
J	2.89	0.003 3^**	2

方差来源 Variance source	效应 Effect	P值 P value	显著性排序 Significant ranking
模型Model	—	0.009 7^**	—
A	-0.56	0.290 0	6
B	0.12	0.810 0	9
C	0.52	0.321 0	7
D	-0.18	0.721 0	8
E	4.40	0.000 7^**	1
F	0.83	0.147 3	4
G	-1.64	0.023 5^*	3
H	0.78	0.165 2	5
J	2.89	0.003 3^**	2

序号 No.	试验参数 Test parameter			堆积角 Repose angle/（°）	相对误差 Relative error/%
序号 No.	E	J	G	堆积角 Repose angle/（°）	相对误差 Relative error/%
1	0.05	0.01	1.0	27.29	31
2	0.07	0.04	0.9	28.32	28
3	0.09	0.07	0.8	31.73	10
4	0.11	0.10	0.7	36.62	7
5	0.13	0.13	0.6	45.92	15
6	0.15	0.16	0.5	50.10	26