六旋翼无人机旋翼转动对测风准确性的影响研究

旋翼无人机可以代替桅杆实现风场的定点或多点同时测量，但是旋翼转动引起的扰流会对测风的准确性产生影响。利用不同高度的支架，在六旋翼无人机上搭载超声波风速仪进行风洞试验，探究旋翼转动对无人机中心上方各高度处风场的影响以及不同风向角和机身倾斜对测量准确性的影响。结果表明:除个别工况外，旋翼转动均会引起较大的风速相对误差；旋翼转动引起的风速误差随高度呈先增大后减小的趋势；机身水平时，随高度增加，各工况下的风速绝对误差趋于一致，且控制风速大于6 m/s时，风速相对误差随风速增大而减小；旋翼转动对风向角测量基本没有影响。研究结果可为多旋翼无人机搭载测风仪器直接测风的实际应用提供参考。

The influence of rotor rotation of hexacopter on wind measurement accuracy

MUAV (Micro Unmanned Aerial Vehicle) can replace the mast to measure the wind field at a fixed point or multiple points at the same time, but the disturbance caused by the rotor rotation can affect the wind measurement accuracy. An ultrasonic anemometer is attached on a hexacopter using different height brackets, and wind tunnel tests are carried out to investigate the influence of the rotor rotation on the wind field at different heights above the center of the hexacopter and the influence of different wind directions and the tilted fuselage on the measurement accuracy. The results show that rotor rotation causes a great relative wind speed error except for a few situations; The wind speed error caused by the rotor rotation increases first and then decreases with height; when the fuselage is horizontal, the absolute wind speed error tends to be the same under various conditions as the height increases, and when the control wind speed is greater than 6 m/s, the relative wind speed error decreases as the wind speed increases. Rotor rotation has almost no influence on the measurement of the wind direction angle. The results can provide reference for the practical application of wind measurement using MUAVs equipped with wind measurement devices.