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US 11,842,716 B2Granted
Global active noise control method for rotorcraft
AssigneeNanjing University of Aeronautics and Astronuatics
InventorsYang Lu, Xice Xu, Mengxue Shao, Jinru Chen
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Abstract
A global active noise control method for a rotorcraft, including: acquiring the acoustic pressure signal at a measuring point of the rotorcraft; predicting the holographic and global sound field of noise of the rotor; reconstructing the reverse sound field of the noise of the rotor; and performing adaptive sound field adjustment based on the optimal phase search.
Claims10
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.
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