Parameter calibration and test verification of discrete element simulation model of radish seed

doi:10.13733/j.jcam.issn.2095-5553.2024.09.019

Abstract

Abstract:

In view of the lack of physical parameters required by radish seed metering device discrete element， the physical parameters of radish seed were measured and the parameters of simulation model were calibrated. In this study， Semen Raphani was taken as the research object，and the mass，volume，density，Poisson′s ratio，shear modulus，static friction coefficient， rolling friction coefficient and collision recovery coefficient of Semen Raphani were measured. Plackett-Burman test was used to select the significant factors from the test parameters of each group with the accumulation angle of radish seeds as the test index， such as static friction coefficient between radish seeds， rolling friction coefficient between radish seeds. Then the central combination design test was carried out for the significant factors，taking the material accumulation angle as the test index，and the test parameters were optimized to determine the best parameter combination of rolling friction coefficient and static friction coefficient between radish seeds as：0. 104， 0. 804. Taking the hanging spoon type vegetable precision metering device as the test object，the simulation and test were carried out and compared with the physical test. The average relative error between the simulation and the physical test results of the single seed rate，multiple seed rate and empty seed rate was less than 3%，which proved the feasibility of optimizing the calibrated discrete element simulation parameters of radish seed，and the research could provide relevant simulation data for the discrete element simulation of radish seed metering machinery.

Key words: radish seed, discrete element simulation, stacking angle, parameter optimization, contrast test

摘要：

针对莱菔子在排种器离散元仿真时所需要的物性参数缺乏的问题，对莱菔子物性参数进行测量及仿真模型参数的标定。以莱菔子为研究对象，测定莱菔子的质量、体积、密度、泊松比、剪切模量、静摩擦系数、滚动摩擦系数、碰撞恢复系数。利用 Plackett-Burman试验以莱菔子堆积角为试验指标，从各组试验参数中选取影响显著的因素：莱菔子间静摩擦系数、莱菔子间滚动摩擦系数。再对显著因素进行中心组合设计试验，以物料堆积角为试验指标，并对试验参数进行参数优化处理，确定莱菔子间滚动摩擦系数与静摩擦系数的最佳参数组合：0. 104、0. 804。以悬勺式蔬菜精量排种器为试验对象进行仿真及试验并与物理试验进行对比验证，其单粒率、多粒率及空粒率的仿真与物理试验结果平均相对误差小于 3%，证明优化标定的莱菔子离散元仿真参数的可行性，为莱菔子排种机械离散元仿真提供相关性仿真数据。

关键词: 莱菔子, 离散元仿真, 堆积角, 参数优化, 对比试验

CLC Number:

S223. 2

Dun Guoqiang, Wang Lei, Ji Xinxin, Jiang Xinbo, Zhao Yu, Guo Na. Parameter calibration and test verification of discrete element simulation model of radish seed[J]. Journal of Chinese Agricultural Mechanization, 2024, 45(9): 127-133.

顿国强 , 王雷 , 纪欣鑫 , 姜新波 , 赵宇 , 郭娜 . 莱菔子离散元仿真模型参数标定与试验验证[J]. 中国农机化学报, 2024, 45(9): 127-133.

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