半夏块茎物理特性研究及离散元仿真参数标定

doi:10.13304/j.nykjdb.2021.0868

摘要/Abstract

摘要：

为设计研究半夏撒播排种器，测定了半夏的本征物理特性参数，并对半夏离散元仿真参数进行标定。通过烘干试验、浸液试验、匀速压缩试验，确定了半夏种子的含水率为62.23%、密度为1 210 kg·m^-3、泊松比为0.373 1、弹性模量为5.751 MPa；通过实际碰撞试验结合仿真试验建立了回归模型，测定半夏-半夏的碰撞恢复系数为0.472 0、半夏-不锈钢板间碰撞恢复系数为0.635 8；通过实际的斜面滑动试验结合仿真试验，确定了半夏-不锈钢板间的静摩擦系数为0.615 4；利用圆筒提升试验结合最陡爬坡试验和Box-Behnken试验，确定了半夏-不锈钢板间的滚动摩擦系数为0.150、半夏-半夏的静摩擦系数为0.554、半夏-半夏的滚动摩擦系数为0.157。该研究结果可为半夏机械化生产装备设计研究和结构优化提供理论参考及设计依据。

关键词: 半夏, 离散元, 物理特性, 堆积角, 标定

Abstract:

In order to design and study the sowing and metering device of Pinellia ternata， the physical parameters of the tuber were measured， and the discrete element simulation parameters were calibrated. Through rying test， soaking test， uniform speed compression test， and it was determined that the water content of pinellia seeds was 62.23%， density was 1 210 kg·m^-3， Poisson’s ratio was 0.373 1， and elastic modulus was 5.751 MPa. The regression model was established through the actual crash test and simulation test， and the crash recovery coefficient of pinellia was 0.472 0， and the crash recovery factor of P. ternata-stainless steel plate was 0.635 8. Through the slope sliding test combined with the simulation regression model， the static friction coefficient between pinellia and stainless steel plate was determined to be 0.615 4. Using the cylinder lifting test combined with the steepest climbing test and the Box-Behnken test， the rolling friction coefficient between pinellia and stainless steel plate was 0.15， the static friction coefficient between pinellia was 0.554， and the rolling friction coefficient between pinellia and pinellia was 0.157. The research results provided theoretical references and design basis for the design research and structural optimization of pinellia mechanized production equipment.

Key words: P. ternata, discrete element, physical parameters, stacking angle, calibration

中图分类号:

S223

杨贵川, 张富贵, 郑乐, 王震, 孔曼曼, 章鑫鹏. 半夏块茎物理特性研究及离散元仿真参数标定[J]. 中国农业科技导报, 2022, 24(10): 99-108.

Guichuan YANG, Fugui ZHANG, Le ZHENG, Zhen WANG, Manman KONG, Xinpeng ZHANG. Tuber Physical Characteristics and Calibration of Discrete Element Simulation Parameters of Pinellia ternata[J]. Journal of Agricultural Science and Technology, 2022, 24(10): 99-108.

图/表 12

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压缩速率Compression rate/ （mm·min^-1）	参数 Paramter	试验编号Test number									平均值Average
压缩速率Compression rate/ （mm·min^-1）	参数 Paramter	1	2	3	4	5	6	7	8	9	平均值Average
1	泊松比μ₁	0.369 5	0.328 7	0.360 0	0.322 6	0.424 4	0.290 4	0.364 1	0.398 8	0.366 5	0.358 3
1	弹性模量E/MPa	4.441 4	4.861 7	4.903 9	5.273 5	6.529 2	5.546 5	4.607 9	4.523 4	5.155 0	5.093 6
3	泊松比μ₁	0.472 8	0.416 0	0.321 7	0.310 2	0.345 3	0.347 6	0.387 1	0.383 3	0.455 6	0.382 2
3	弹性模量E/MPa	5.706 8	6.398 7	6.986 3	5.505 2	6.299 6	7.351 6	7.236 3	5.751 7	6.007 6	6.360 4
5	泊松比μ₁	0.298 8	0.461 9	0.347 0	0.358 4	0.335 6	0.418 6	0.343 4	0.424 0	0.432 2	0.378 7
5	弹性模量E/MPa	4.777 2	6.739 2	5.968 6	6.707 3	7.255 8	6.491 0	4.481 3	4.773 9	5.160 5	5.817 2

压缩速率Compression rate/ （mm·min^-1）	参数 Paramter	试验编号Test number									平均值Average
压缩速率Compression rate/ （mm·min^-1）	参数 Paramter	1	2	3	4	5	6	7	8	9	平均值Average
1	泊松比μ₁	0.369 5	0.328 7	0.360 0	0.322 6	0.424 4	0.290 4	0.364 1	0.398 8	0.366 5	0.358 3
1	弹性模量E/MPa	4.441 4	4.861 7	4.903 9	5.273 5	6.529 2	5.546 5	4.607 9	4.523 4	5.155 0	5.093 6
3	泊松比μ₁	0.472 8	0.416 0	0.321 7	0.310 2	0.345 3	0.347 6	0.387 1	0.383 3	0.455 6	0.382 2
3	弹性模量E/MPa	5.706 8	6.398 7	6.986 3	5.505 2	6.299 6	7.351 6	7.236 3	5.751 7	6.007 6	6.360 4
5	泊松比μ₁	0.298 8	0.461 9	0.347 0	0.358 4	0.335 6	0.418 6	0.343 4	0.424 0	0.432 2	0.378 7
5	弹性模量E/MPa	4.777 2	6.739 2	5.968 6	6.707 3	7.255 8	6.491 0	4.481 3	4.773 9	5.160 5	5.817 2

序号 Number	x：恢复系数 Recovery coefficient	碰撞后最大爬升高度Maximum climb height after collision/mm
序号 Number	x：恢复系数 Recovery coefficient	y_a：块茎a Tuber a	y_b：块茎b Tuber b
1	0.20	8.96	17.91
2	0.30	6.40	19.84
3	0.35	6.51	22.55
4	0.40	4.29	21.98
5	0.45	4.68	26.50
6	0.50	4.21	27.48
7	0.60	1.81	30.81
8	0.70	1.36	34.45
9	0.80	1.36	39.74
10	1.00	0.00	50.00

序号 Number	x：恢复系数 Recovery coefficient	碰撞后最大爬升高度Maximum climb height after collision/mm
序号 Number	x：恢复系数 Recovery coefficient	y_a：块茎a Tuber a	y_b：块茎b Tuber b
1	0.20	8.96	17.91
2	0.30	6.40	19.84
3	0.35	6.51	22.55
4	0.40	4.29	21.98
5	0.45	4.68	26.50
6	0.50	4.21	27.48
7	0.60	1.81	30.81
8	0.70	1.36	34.45
9	0.80	1.36	39.74
10	1.00	0.00	50.00

序号 Number	x₁：恢复系数Recovery coefficient	y₁：回弹高度Rebound height/ mm
1	0.58	37.58
2	0.60	40.43
3	0.62	43.29
4	0.64	46.24
5	0.66	49.46
6	0.68	52.70
7	0.70	55.98