切削加工より製作されるクアッドコプター用小径プロペラの騒音解析

Abstract

The quadcopter has been spotlighted in recent years as an unmanned aircraft used for aerially transporting goods to remote areas during disasters. An advantage of the quadcopter is that it can be used in a narrower flight airspace than a fixed-wing aircraft, as the quadcopter has a vertical rise and vertical drop. However, there are a number of issues associated with quadcopters, such as safety and noise. Noise is generated by the propeller. Especially, for small quadcopters, the noise generated by rotation is serious because of the high-speed rotation of the small propeller. However, there are few reports on reducing the noise by small propellers. Conventional small propellers are made using parameters such as size and twist angle, but sufficient consideration has not been given to the propeller’s surface roughness. Therefore, we cleared the surface-roughness dependence and size-dependence on the noise. Propellers of various sizes and surface roughnesses were fabricated by NC machining, and their resulting noise was measured. We found that the surface roughness of the propeller blade influences the rotation noise of the small propeller.