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The noisy sound propagated from the machinery should be reduced to maintain silent environment around the machinery. To achieve such the requirement, the nearfield acoustic holography (NAH) has been developed for sound source localization, and the information of the source locations is utilized to make the machinery silent effectively. While actual machinery has complicated shape and three-dimensional extension of the structure, the NAH provides planer reconstructed images. It is difficult to grasp the three-dimensional source locations with only a planer image. In addition, when the true source is not on the surface of the machinery, the structure of the machinery around the true source might interfere the assumption that the sound propagates in free field. In this study, the model source is used in the experiment, that has a loud speaker, and the baffle plate which is located in front of the loud speaker. The sound propagated from the loud speaker might be reflected and diffracted by the baffle plate. It is proposed that some measurement apertures should be located around the source to solve the three-dimensional source locations, so a compact two-dimensional microphone array is used to move it easily around the source. Source localization is carried out by the NAH with a small number of microphones of the compact array, and requirement of the filtering on the spatial Fourier domain is mentioned. It is proved experimentally that the sound source localization is achieved properly. The experimental results are discussed with numerical results solved by the boundary element method.

Sound Source Localization for the Source with Sound Reflection and Diffraction Phenomena Caused by the Source Shape