A method to identify the noise radiation regions of acoustic source

This paper presents a method to identify the noise radiation regions of an acoustic source from a small number of measurement points. First, the acoustic radiation modes that contribute to the acoustic far-field are selected. Next, the velocities on the surface of the acoustic source are reconstructed based on the selected acoustic radiation modes. Finally, the noise radiation regions are determined from the surface areas that have larger amplitude of the reconstructed velocities. Numerical simulations of a rectangular plate are conducted to validate the efficiency of the proposed approach, and different analyzing frequencies are considered. The proposed approach facilitates the identification of the noise radiation regions of an acoustic source and can also be applied to reduce the radiation noise in the far-field.