Authors

Abstract

When UAVs apply a pesticide at different speeds, droplet deposition area and canopy vortex area are not at the same location, which prevents droplets from depositing on the backside of leaves and lower part of plants in canopy vortex, and affects spray quality and pests and diseases control effect. To shorten the distance between the two areas and improve droplet penetration, a method for adjusting nozzle inclination angle based on droplet force analysis and tests was proposed in this paper. According to the obtained model, an automatic nozzle angle adjustment system was developed from hardware and software. The experimental results showed that the number of droplets deposited on the entire leaf increased by 21.58% when UAV spraying with the system mounted. The average number of droplets on the front side of the leaf increased by 14.44% while 66.05% was on the backside of the leaf with the system mounted. This indicates that the method and system proposed have a significant impact on improving the UAV spray penetration.

Abstract in Chinese

无人机以不同速度施药时，液滴沉积区和冠层涡流区不在同一位置，导致液滴无法沉积在叶片背面和植物下层，影响喷雾质量和病虫害控制效果。为了弥补两区域之间的间距并提高液滴渗透率。本文基于液滴受力分析和试验，提出了一种调整喷嘴倾角的方法。发现最佳喷管角度(y)与无人机飞行速度(x)的关系为：y = -0.367x2 + 6.2932x–0.8438，R2 = 0.8333。根据该模型，从硬件和软件上开发了自动喷嘴角度调整系统。结果表明，安装该系统的无人机喷洒后，沉积在整个叶片上的液滴数量增加了21.58%，叶片正面平均液滴数增加了 14.44%，而叶片背面的液滴数量增加了 66.05%。这表明所提出的方法和系统对提高无人机喷雾穿透能力有显着影响。