US 11,842,716 B2
Global active noise control method for rotorcraft
Yang Lu, Nanjing (CN); Xice Xu, Nanjing (CN); Mengxue Shao, Nanjing (CN); and Jinru Chen, Nanjing (CN)
Assigned to NANJING UNIVERSITY OF AERONAUTICS AND ASTRONUATICS, Nanjing (CN)
Filed by NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS, Nanjing (CN)
Filed on Mar. 23, 2022, as Appl. No. 17/701,810.
Prior Publication US 2022/0223132 A1, Jul. 14, 2022
Int. Cl. G10K 11/178 (2006.01)
CPC G10K 11/17823 (2018.01) [G10K 11/17873 (2018.01); G10K 2210/1281 (2013.01); G10K 2210/3027 (2013.01); G10K 2210/3044 (2013.01); G10K 2210/3055 (2013.01); G10K 2210/30232 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A global active noise control method for a rotorcraft, comprising:
measuring, by an acoustic measuring device array arranged on the rotorcraft, noise of the rotorcraft;
inputting a noise pressure signal of the rotorcraft to acquire an acoustic mode expansion form of a global rotor noise by using an acoustic analysis method;
online estimating optimal acoustic modal coefficients based on acoustic holography by using a measurement signal of the acoustic measuring device array to obtain an acoustic holographic global sound field of a rotor;
based on the acoustic holographic global sound field, online generating a secondary sound field that achieves global sound-sound cancellation with the global rotor noise according to a sound field construction method by using a secondary acoustic source array;
inputting the optimal acoustic modal coefficients to online calculate a real-time control signal of the secondary acoustic source array according to an acoustic modal orthogonal relationship; and
online adjusting the real-time control signal of the secondary acoustic source array by using an adaptive method to realize global noise reduction of the rotor under different flight conditions.