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Influence of nozzle enabling strategy on spray deposition of crop protection unmanned aerial system

International Journal of Agricultural and Biological Engineering 2021年第4期14卷 53-61页

作者： Wei Gu Xinyu Xue Chen Chen Qingqing Zhou Songchao Zhang Bin Peng Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China Key Laboratory of Aviation Plant Protection Ministry of Agriculture and Rural AffairsAnyang 455000HenanChina xag co. LtdGuangzhou 510663China

Proper nozzles arrangement is significant to improve spray deposition of crop protection unmanned aerial system(UAS).Besides fuselage structure,the co.trol strategy is another nozzle location changing method when there are multiple sets of nozzles.A four-rotor crop protection UAS equipped with four centrifugal nozzles was used to co.duct a field experiment in the rupturing stage of *** sets of nozzles in the front and rear of the fuselage were enabled independently to investigate spray deposition,including spray co.erage and droplet density on the sampling *** nozzle rotating speeds and flight speeds were employed in the experiment to study the influence of nozzle location on the *** different nozzle rotating speeds,the droplet spectrum co.ld be *** results show that the average co.erage and average cumulative droplet density are negatively co.related with flight *** droplet density is also negatively co.related with the droplet *** deposition of front nozzles is significantly reduced co.pared with that of the rear nozzles under the same spray parameters,especially when the droplet size is too large or the flight speed is too *** reduction is mainly co.centrated in the center area of the spray *** a result,the average cumulative droplet density of the front nozzles decreases by 25.96%in *** average droplet density decreases by 18.54%when the droplet size is smaller than 100μm,decreases by 25.02%when between 100μm and 200μm,and decreases by more than half when larger than 200μ*** research can provide guidance for the installation of UAS nozzles and spray co.trol strategy design.

关键词： crop protection unmanned aircraft system nozzles arrangement spray co.erage droplet density

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Parameters optimization of crop protection UAS based on the first industry standard of China

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International Journal of Agricultural and Biological Engineering 2020年第3期13卷 29-35页

作者： Songchao Zhang Baijing Qiu Xinyu Xue Tao Sun Bin Peng Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013China Key Laboratory of Plant Protection Engineering Ministry of Agriculture and Rural AffairsZhenjiang 212013China Nanjing Institutes for Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China Guangzhou xag co. LtdGuangzhou 510663China

The effective swath width(ESW)and the droplet penetration rate(DPR)directly affect the spraying quality,the spraying efficiency and the co.trol effect of pests and diseases during the crop protection unmanned aircraft system(CPUAS)***,the ESW and DPR are not co.stant with the changes of the flight speed(FS)and the flight height(FH).In order to investigate the ESW and DPR of the CPUAS P20,four levels of FS(3 m/s,4 m/s,5 m/s and 6 m/s)and three levels of FH(1.5 m,2.0 m and 2.5 m)experiments were carried out acco.ding to the first industry standard of China for the CPUAS in the wheat *** results demonstrated that the ESWs were negatively co.related with the FS and the *** of the ESWs were over 2 m in the 12 treatments,in which the maximum one was 3.25 m(3 m/s,1.5 m).The DPRs were negatively co.related with the FH under the same FS,the average value of the DPRs was 48.37%,in which the maximum one was 78.34%(4 m/s,1.5 m)and the minimum one was 25.5%(6.0 m/s,2.5 m).The statistical analyses showed that the FS had significant impacts on the ESWs(0.010.05).The impacts of both FS and FH on the DPRs were extremely significant(p-valueco.cluded that reducing the FS co.ld increase the ESWs,and reducing the FH co.ld increase the DRPs at the same *** co.clusion,the maximum spraying efficiency of P20 was 4.342 hm2/h with 6 m/s FS and 1.5 m FH in case of satisfying the requirement of *** study provided scientific references for guiding the CPUAS spraying.

关键词： crop protection unmanned aircraft system standard effective swath width penetration parameter optimization

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