关键词: 多旋翼植保无人机, 火龙果树, 作业参数, 雾滴, 沉积分布

Abstract: To explore the effects of operating parameters of multi-rotor unmanned aerial vehicles (UAVs) on droplet deposition distribution in pitaya canopy, the P20 multi-rotor electric plant protection UAV was used to carry out spray test on pitaya trees. The main operating parameters (flight height, flight speed and flight route direction) were optimized by orthogonal test. The results indicated that, when the flight route was parallel to the planting line with flight height 1.5 m (height from the top of the canopy) and flight speed 1.5 m·s-1, the droplet deposition density and coverage rate in each canopy of pitaya trees both reached peaks. The results of range analysis showed that, flight speed was the most important factor affecting the droplet deposition density and the droplet coverage in the upper layer of pitaya canopy, and flight height was the most important factor affecting the droplet coverage in the middle and lower layers of pitaya canopy as well as the droplet deposition uniformity. The droplet deposition uniformity measured the best when the flight height was 1.5 m. According to the deposition distribution of droplets in pitaya canopy, the operating parameters of P20 multi-rotor electric plant protection UAV were optimized, which provided reference for improving the effective deposition distribution of spray droplets in the canopy of pitaya trees, and realizing the efficient application of the selected type of plant protection UAV in the prevention and control of diseases and pest of pitaya.

Key words: Multi-rotor plant protection UAV, pitaya, spraying parameters, droplet, deposition distribution