吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (1): 386-396.doi: 10.13229/j.cnki.jdxbgxb20190848
• 农业工程·仿生工程 • 上一篇
Xue-shen CHEN(),Zhu-jian HUANG,Xu MA(),Long QI,Gui-jin FANG
摘要:
为使除草部件的作业路径能避开稻苗,降低机械除草的伤苗率,设计了一种机器视觉与液压伺服控制技术相结合的避苗控制系统。采用垂直俯拍方式,提取了稻苗冠层边界的形心图像坐标位置,通过小孔成像模型转换,获得稻苗地面坐标位置及除草部件中心与苗行中心线的距离。建立了平行四杆纠偏机构的液压控制系统模型,获得纠偏调控量与液压推杆的映射关系。基于PID 控制算法,建立了比例阀液压系统数学模型,应用Matlab/Simulink仿真表明:模型的稳态响应时间约为0.28 s,静差约为0.07 mm。进行了台架试验,结果表明:图像处理系统提取苗行中心线误差不超过3 cm;正交试验结果表明:避苗控制系统中伤苗率的影响因素主次顺序为:行进速度、移栽天数、稻苗间距,当行进速度为0.8 m/s、移栽天数为10 d、稻苗株距为12 cm时,伤苗率为2.48%。
中图分类号:
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