Directivity identification method for noise sources of engine and parts thereof

The invention discloses a directivity identification method for noise sources of an engine and parts thereof, and belongs to the technical field of noise source separation of aero-engines and parts thereof. The sound source noise is experimented through a microphone array, and if the spectral characteristics of the noise of each part of the sound source are obtained, the sound power spectrum matrix about the intensity, namely directivity, of each sound source can be constructed only by using a sufficient number of microphones; by applying an SODIX-Bes inversion algorithm, the sound source intensity and directivity can be obtained by solving from a benign linear algebraic equation set. The sound source directivity simulation technology (SODIX) based on a cross-spectrum matrix developed by the DLR of German is improved. According to the invention, the noise directivity and sound intensity of the engine and each part thereof can be separated from the experimental data of the whole engine noise or the part noise