Document Type : Scientific extension

Authors

1 Associet Professor, Aerospace University Complex, Malek Ashtar University, Tehran, Iran.

2 M.SC student. Aerospace University Complex, MalekAshtar University, Tehran, Iran.

Abstract

Unmanned aerial vehicles (UAVs) like drones (quadcopters, hexacopters, octocopters, etc.) can be a source of significant acoustic noise. High noise makes them less suitable for use in densely populated urban areas, particularly during take-off, landing, and low-level flight, due to the noise annoyance. This paper reviews the methods and proposes some concepts for the attenuation of UAV noise. Both passive and active solutions are considered. Solutions with piston engine silencer, Q-tip propeller, more propeller blades, absorptive and reflective barrier, ducted propeller, sound absorbing ducts, synchrophaser, multichannel active noise cancellation (ANC) system with secondary sources circularly arranged around the propeller and the system with magnetically excited propeller blades are mentioneds

Keywords

Main Subjects

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