The wideband holography has been developed and extensively applied to the near-field sound sources localization in the recent years. It can be used to reconstruct the sound field for a broad frequency range, and does not require the microphone array to have a specific sensor arrangement. However, the existing wideband holography algorithm can only be applied for localizing stationary sound sources (i.e., sources that are not moving). In the current study, the wideband holography algorithm has been extended to track and visualize rotating sound sources with a known rotating speed. Firstly, the sound fields at selected frequencies are reconstructed using the rotating source wideband holography. Then, each single frequency reconstruction is multiplied by the exponential time phasor, and only the real part of sound field is used to obtain a time-domain visualization of rotating sources. Finally, it is demonstrated that, sound field at several rotating modulation frequencies need to be combined to visualize the rotating motion of the sources. Simulations with rotating monopoles are conducted to validate the proposed method. Numerical results suggested that the developed method can be used to track the motion of the rotating sources and, at the same time, estimated the strength of each source.
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