| 植保无人机下洗气流对作物冠层作用规律研究 |
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| 引用本文： | 田志伟,薛新宇,徐阳,杨风波,孙竹.植保无人机下洗气流对作物冠层作用规律研究[J].农业机械学报,2021,52(1):40-48. |
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| 作者姓名： | 田志伟 薛新宇 徐阳 杨风波 孙竹 |
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| 作者单位： | 农业农村部南京农业机械化研究所 |
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| 基金项目： | 国家重点研发计划项目(2017YFD0701000)和中国农业科学院基本科研业务费专项（SR201903） |
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| 摘 要： | 植保无人机作业过程中,旋翼下洗气流不仅会对雾滴沉积效果产生影响,还会对作物冠层产生扰动作用.揭示冠层扰动区域的特点,有助于理解无人机作业特征,可为优化雾滴沉积效果和施药系统提供理论依据.本文通过航拍方法和机器视觉技术研究了无人机下洗气流对作物冠层的影响.结果表明:单旋翼和多旋翼无人机下洗气流所引起的作物冠层扰动区域特征...
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| 关 键 词： | 植保无人机 下洗气流 作物冠层 涡旋 光流法 |
| 收稿时间： | 2020/4/17 0:00:00 |
Effect of Plant Protection UAVs Downwash on Crop Canopy |
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| TIAN Zhiwei,XUE Xinyu,XU Yang,YANG Fengbo,SUN Zhu.Effect of Plant Protection UAVs Downwash on Crop Canopy[J].Transactions of the Chinese Society of Agricultural Machinery,2021,52(1):40-48. |
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| Authors: | TIAN Zhiwei XUE Xinyu XU Yang YANG Fengbo SUN Zhu |
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| Institution: | Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs |
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| Abstract: | During the spraying application of plant protection UAV, the rotor downwash will not only affect the droplet deposition, but also cause disturbance to the crop canopy. Revealing the characteristics of the canopy disturbing area is helpful to understand the application characteristics of the UAV, and can also provide a theoretical basis for optimizing the droplet deposition effect and the UAV spraying system. The effects of UAVs downwash on crop canopy were studied by the methods of aerial photography and machine vision technology. The results showed that there were significant differences in the characteristics of the crop canopy disturbing area caused by the single-rotor and multi-rotor UAVs downwash. Under a hovering situation the single-rotor UAV had a ring-shaped disturbing area with a large size, the multi-rotor UAV had a circular shape with a small size. Due to the influence of the asymmetrical structure of the UAV body, the disturbing area characteristics for the forward and backward movement attitudes of the single-rotor UAV were different. When advancing, this area was small and irregular, while moving backward it was large and distributed in a U-shape. Under the two flight modes, the multi-rotor UAV was basically the same in terms of size and shape of canopy disturbing area. Moreover, the flight speed had a significant effect on the characteristics of the canopy disturbing area. When UAV flying with a low speed, this area was more concentrated with a nearly circular distribution, and the plants were swung heavily;when operating with a high speed, the downwash was swept over crop canopy and the disturbing area was distributed in a strip shape, and the plants were swung lightly. As for the P20 plant protection UAV, when the flight speed was increased from 3m/s to 6m/s, the average lag distance of the canopy disturbing area was 1.77m, 2.71m, 3.61m and 4.31m, respectively. The lag distance of disturbing area was proportional to the flight speed of the UAV. In addition, the faster the speed was, the weaker the resistance of the downwash was to natural wind, which was not conducive to contain the droplets drift, and the position of the canopy disturbing area was unstable. Based on the research results, it was pointed out that plant protection UAV rotor downwash can only effectively promote the droplet penetration under the premise of the low operating speed and the overlap of the position for droplet deposition and canopy disturbing area. |
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| Keywords: | plant protection UAV downwash crop canopy vortex optical flow method |
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