An algorithm for the source localization of incipient vortex cavitation is suggested. Model scale experiment is performed in the Samsung cavitation tunnel to analyze the acoustic characteristics of propeller incipient vortex cavitation and desired target frequencies are determined for the localization based on the experiment. Incipient cavitation is modeled with monopole type sound sources and the source location is set as unknown. Incoherent matched-field inversion signal processing technique is applied to find the optimum source position by comparing the spatial correlation between received pressure fields and numerically computed replica pressure fields at the same position of receiver array. The replica pressure fields are obtained by direct-path ray method within an area in which the source is expected to be. Hybrid optimization algorithm is applied for an efficient search of source position. For the validation of suggested localization algorithm, localization is performed with synthetic data and virtual source. Consequently, it is found that this suggested localization method enables efficient localization of incipient cavitation using a few pressure data measured on the outer hull above the propeller.

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