无人旋翼机航空施药有效喷幅确定方法比较

针对无人旋翼机航空施药存在喷雾不均、施药效果差的问题,利用雾滴密度判定法、最小变异系数判定法和50%有效沉积判定法在静风条件下对单旋翼无人机航空施药时的喷雾幅宽和喷雾均匀性进行研究,结果表明:1)最小变异系数法得到的有效喷幅最小,仅为1.8m,沉积分布均匀性最好,变异系数仅为2.1%;2)雾滴密度判定法得到的有效喷幅最大,为3.9m,沉积分布均匀性也最差,变异系数为19.3%。3)通过最小变异系数判定法分析发现,药液沉积分布变异系数随着有效喷幅宽度的增加呈现先减小再增加的趋势,当有效喷幅超过一定值后,有效喷幅宽度与沉积分布变异系数成线性正相关。

Effective spray swath width determination of aerial spraying using unmanned aerial vehicle

Unmanned aerial vehicle (UAV) could be an appropriate flying platform used to accomplish plant protection,and it had a wide range of application prospects in agricultural production.However,there were still no standards available for UAV aerial spraying at present.In this study,the spray swath width of a single rotor unmanned helicopter was measured under no wind condition.Effective spray swath width was determined by three different methods:Droplet density determinate method,minimum acceptable deposition coefficient variation (CV) values determinate method and 50% effective application rate determinate method.The results showed that the effective spray widths of the helicopter were different by these methods:1)The effective spray width of minimum acceptable deposition CV values determinate method was 1.8 m,which was the minimum one with the best deposition distribution uniformity,and its CV was 2.1%;2)50% effective application rate determinate method is the following one;Droplet density determinate method had the biggest effective spray width,3.9 m,with the worst deposition distribution uniformity;and its CV was 19.3%.3)Along with the increase of effective spray swath width,deposition coefficient variation (CV) values increased at first and later decreased.When spraying swath width exceeded over a certain value,the effective spray swath width was linearly correlated with deposition CV values.