Four-rotor agricultural unmanned aerial vehicle with blades in cambered surface distribution

Abstract

A pair of large propellers is used for constructing ''reversing propellers with a common rod'', rotating shafts of two propeller disks and a rod form an isoceles triangle, the lower surfaces of the two propeller disks are positioned at an arc line, and the length of the rod is longer than the diameter of the propeller disks; a pair of small propellers is used for constructing ''reversing propellers with a common shaft'', and the small propellers are made in the shape of arcs; through several carbon fiber tubes and connecting fixing pieces, the ''reversing propellers with a common rod'' and the ''reversing propellers with a common shaft'' form a four-rotor unmanned aerial vehicle structure which is in mirror symmetry in left and right and asymmetrical in front and back, and the rod is perpendicular to the shaft; the direction of downwash flow is the direction of an outward normal of cambered surfaces; therefore, the four-rotor agricultural unmanned aerial vehicle with the blades in cambered surface distribution is named. Compared with a four-rotor unmanned aerial vehicle with blades in the structure of horizontal distribution and central symmetry sold in the market, the four-rotor agricultural unmanned aerial vehicle with the blades in cambered surface distribution has the advantages that the flow rate of the downwash flow is effectively reduced, the area of the downwash flow is enlarged, crops are protected, and the working performance is improved.

Description

technical field [0001] 1. Agricultural plant protection. [0002] 2. Aerodynamics. [0003] 3. Force balance analysis. Background technique [0004] 1. At present, the rotorcraft used for agricultural plant protection and fertilization on the market are distributed in a plane, that is, the axes of each rotor are parallel to each other, so that the flow rate of the downwash air is very high. If the aircraft is closer to the crops, it will If the crops are crushed, if the soil is loosened, the soil will be blown away, especially the rotor plant protection machine with a dead weight of more than 50KG. If the plane flies very high, the spray mist will drift again, causing spray leakage, chemical damage and pollution. [0005] 2. It is not designed according to the characteristics of agricultural operations, and there is still a lot of room for improvement in operating efficiency. Most of the plant protection machines on the market are experimental products that have been asse...

AI Technical Summary

Problems solved by technology

If the plane flies very high, the spray mist will drift again, causing spray leakage, pesticide damage and pollution

[0005] 2. There is no design based on the characteristics of agricultural operations, and there is still a lot of room for improvement in operating efficiency. Most of the plant protection machines on the market are experimental products made up

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