Study on Noise Sources of Multi-rotor Aircraft

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A review of the basic and major sources of noise emanating from a multirotor aircraft is

presented in this paper. The noise generated by multirotor aircraft, also known as drones, is a growing

concern as their use becomes more widespread. The main sources of noise from a multirotor aircraft are the

rotors, the propulsion system, and the airframe. The rotors are the primary source of noise from a multirotor

aircraft. The noise is generated by the interaction of the blades with the surrounding air, resulting in a tone

that is directly proportional to the rotational speed of the blades. The propulsion system, consisting of the

motor and the propeller, is another significant source of noise. The airframe, which includes the body and the

landing gear, can also contribute to the overall noise level. Various factors affect the noise level emitted by a

multirotor aircraft, including the design and configuration of the rotors and propulsion system, the operating

conditions, and the type of flight maneuvers performed. For example, hovering and high-speed flight can

generate higher levels of noise compared to cruising flight. Several approaches have been proposed to reduce

the noise generated by multirotor aircraft. These include optimizing the design and configuration of the rotors

and propulsion system, using noise-absorbing materials, and implementing active noise control techniques.