Authors

Abstract

This paper addresses issues of high seedling damage rate, low weeding efficiency, and excessive force on tools in existing corn inter-row weeding machinery by designing a cycloid-type inter-row weeder. Firstly, MATLAB simulation analyzed key parameters (plant spacing, safety zone radius, tool radius) under ideal conditions. Optimal parameters were identified as 155mm spacing, 40mm safety zone radius, and 80mm tool radius, achieving maximum weeding area coverage (78.69%) without tool intrusion into the safety zone. Secondly, to optimize tool force, a soil bin discrete element model was built using EDEM. A three-factor (plant spacing, weeding depth, forward speed), three-level orthogonal experimental design was employed for virtual simulation. Analysis revealed weeding depth had the greatest impact on resistance, followed by forward speed and plant spacing. Finally, optimized operational parameters were determined: 250mm spacing, 62mm weeding depth, and 0.250m/s forward speed. This combination yielded an average weeding rate of 86.06% and reduced average seedling damage to 2.76%, meeting standard agronomic requirements.

Abstract in Chinese

针对现有玉米株间除草机械存在的伤苗率高、除草率低及除草刀具受力过大等问题，本文设计了一款摆线式株间除草机械。首先，利用MATLAB软件对理想状态下关键参数（株距、保护区半径、刀具半径）进行仿真分析，确定在株距155mm、保护区半径40mm、刀具半径80mm时，可确保刀具不侵入保护区且除草面积覆盖率最大（78.69%）。其次，为优化刀具受力，基于EDEM软件构建土槽离散元模型，采用三因素三水平正交试验设计（因素：株距、除草深度、前进速度），分析其对刀具最大受力的影响。结果表明：除草深度对阻力的影响最大，其次为前进速度和株距。最终优化得到最佳作业参数组合（株距250mm、除草深度62mm、前进速度0.250m/s），该组合下平均除草率达86.06%，平均伤苗率降至2.76%，满足农艺要求。