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气吸振动式排种器种盘内种群运动特性分析

发表时间:2010-09-30  浏览量:1201  下载量:553
全部作者: 赵湛,李耀明
作者单位: 江苏大学现代农业装备与技术省部共建教育部重点实验室
摘 要: 采用离散元法(discrete element method,DEM)模拟振动种盘内种群的三维运动规律,提出用体积膨胀系数H描述种群空间运动状态,模拟结果表明:H的平均值随种盘振动强度Kv的增大而增大,随种层厚度的增加而减小;H的波动系数随Kv的增加首先迅速增大,然后缓慢减小;在相同振动强度下,种盘振幅越大,种群离散程度越高,H的波动性越强。经JPS-12气吸振动式排种器性能检测试台的试验结果验证,初始油菜种层厚度约为8 mm,负压差Δp=2 kPa,滚筒转速ω=10 r/min,振动频率在60 Hz附近时,排种器的吸种精度最高,达到95%.
关 键 词: 农业工程;气吸振动式;精密排种器;种群;运动特性;数值分析
Title: Study on seeds kinetic characteristic in vibration bed of vacuum seeder
Author: ZHAO Zhan, LI Yaoming
Organization: Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education and Jiangsu Province, Jiangsu University
Abstract: A Matlab program based on the discrete element method was developed to analyze the seeds kinetic characteristic in a vibration bed and a coefficient of volume expansion H was proposed to describe the seeds motion states. Simulation results show that the mean H increases with the increasing of vibration strength Kv and decreased with the seeds initial thickness. With the increasing of Kv, the fluctuation coefficient of H first increases quickly to the maximal value and then decreases slowly. Under the same Kv, the mean and the fluctuation coefficient of H both increase with the increasing of vibration amplitude of seeds bed. Experiments were carried out on the JPS-12 vacuum-vibration precision seeder and the best sowing precision of 95% was received with the seeds initial thickness of 8 mm, vacuum differential pressure of 2 kPa, cylinder rotational speed of 10 r/min and bed vibration frequency of 60 Hz.
Key words: agricultural engineering; vacuum-vibration; precision seeder; seeds; kinetic characteristic; numerical analysis
发表期数: 2010年9月第18期
引用格式: 赵湛,李耀明. 气吸振动式排种器种盘内种群运动特性分析[J]. 中国科技论文在线精品论文,2010,3(18):1836-1841.
 
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