Multi-rotor aircraft noise suppression method based on phase angle control

Abstract

The invention discloses a multi-rotor aircraft noise suppression method based on phase angle control, and the method comprises the following steps that a system obtains the three-dimensional coordinates of a target noise reduction position, and transmits the position information to a noise prediction module; the flight control module takes the attitude angle and the speed as characteristic parameters and sends the characteristic parameters to the noise prediction module; the noise prediction module calculates noise information generated by a rotor at a target position through a rapid noise prediction method and sends the noise information to the phase angle optimization module; the phase angle optimization module obtains an optimal phase angle combination based on an optimization algorithmand sends the optimal phase angle combination to the phase synchronization control module; and the phase synchronization control module adjusts the phase angle positions of the plurality of rotors according to the received optimal phase angle combination in combination with the phase angle position information to realize noise reduction of the target position. According to the invention, the target function can be adjusted and optimized according to the noise reduction requirement, and compared with a passive noise reduction method, the method of the invention can control noise components ina targeted mode and has a better inhibition effect on multi-rotor-wing low-frequency-band noise.

Description

technical field [0001] The invention belongs to the field of rotor aerodynamic noise, in particular to a noise suppression method for multi-rotor aircraft based on phase angle control. Background technique [0002] Multi-rotor aircraft can perform unique flight skills such as vertical take-off and landing, hovering in the air, low-altitude flight and in-situ rotation, and has the advantages of stable flight and agile manipulation. At present, multi-rotor aircraft have been widely used. In the military, it can be used to perform tasks such as reconnaissance, bomb-carrying operations, and detonation. In civilian applications, it can be used in surveying and mapping, film and television aerial photography, line inspection, plant protection, and wild animal tracking. and management etc. However, the adverse effects of multi-rotor aircraft—noise has gradually attracted attention, which has become one of the key factors limiting the development and application of multi-rotor airc...

AI Technical Summary

Problems solved by technology

However, the spatial distribution of noise radiated by multi-rotor aircraft is relatively complex, and active noise control is difficult to achieve and requires a higher cost

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