Parameter Calibration and Experiment of Rice Seeds Discrete Element Model with Different Filling Particle Radius

被引：0
作者：
Zhang R. [1 ]
Jiao W. [1 ]
Zhou J. [1 ]
Qi B. [2 ]
Liu H. [1 ]
Xia Q. [2 ]
机构：
[1] Shandong Academy of Agricultural Machinery Sciences, Ji'nan
[2] Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing
来源：
Qi, Bing (qb0823521@163.com) | 1600年 / Chinese Society of Agricultural Machinery卷 / 51期
关键词：
Calibration; Discrete element model; Filler particles radius; Rice seeds;
D O I：
10.6041/j.issn.1000-1298.2020.S1.026
中图分类号：
学科分类号：
摘要：
The coupled simulation of gas-solid two-phase flow was widely used in the study of the working process of pneumatic seed metering devices, the seed model was mostly modeled by particle aggregation formed through particle aggregation without overlapping. The simulation seed model would be closer to the real shape of the seed with smaller radius and larger number of filled spherical particles by this method. But the simulation computing resources would be overconsumed and the simulation time would be increased as the method was used. The rice seeds were taken as research object in order to study the effect of rice seed models with different filling sphere radii on the dynamic response characteristics between particles and find the optimal number of filled balls for the seed model. The bonding aggregation model of rice particles for gas-solid coupling was formed by filling with spherical particles of different radii (0.30 mm, 0.21 mm, 0.18 mm, 0.16 mm and 0.15 mm) after the shape of the seed was got with the aid of 3D scanning and inverse fitting method. The static friction coefficient and dynamic friction coefficient of seed model filled with balls of different radii were calibrated by lifting with bottomless cylinder, sliding accumulation between real test and simulation, using the curve surface correspondence method and the index was the angle of repose. The results showed that the simulation time and simulation accuracy were the best when the filled particle radius was 0.21 mm verified by the gas-solid two-phase flow coupling simulation test of the rice seed metering device with positive pressure as the indicator was seed filling rate. © 2020, Chinese Society of Agricultural Machinery. All right reserved.
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页码：227 / 235
页数：8
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