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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：1571 下载量：692
| 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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