Nearfield acoustic holography based on inverse boundary element method for moving sound source identification

A method for realizing noise source identification of the arbitrary shaped moving structure is present. A theoretical model is established, which is a combination of moving frame acoustic holography (MFAH) and acoustic holography based on boundary element method (BEM-based NAH). MFAH can change time-domain data which existing Doppler effects into the dual plane holographic data which is needed in the BEM-based NAH. The surface acoustic information of an arbitrary structure is reconstructed by BEM-based NAH, which can be used for location of noise source. It not only has the MFAH's fast and easy characteristics for dealing with movement problem, but also has the BEM-based NAH characteristics of dealing with arbitrary shape. Finally, an experiment test was conducted by using a moving hooded cylindrical shell which speed is 9.96 cm/s as research object in the semi-anechoic pool. The results showed that: the method can accurately realize the inversion of the structure of the surface of active sound intensity and sound pressure and other information in sound field, thereby achieving noise source location. Because of the condition limited, high-speed verification is needed in the future.