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Updated: Dec 20, 2025

Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
Incipient tip vortex cavitation localization using block-sparse compressive sensing
Minseuk Park1, Yongsung Park1, Keunhwa Lee2
1Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Abstract:
Noise induced by incipient-propeller tip vortex cavitation (TVC) has a few sources near the propeller tips, which radiate a broadband signal. This article describes a compressive sensing (CS)-based TVC localization technique for coherent multiple-frequency processing, which jointly processes the measured data at multiple frequencies. Block-sparse CS, which groups several single-frequency measurements into blocks, is adopted for coherent multiple-frequency processing. The coherent multiple-frequency processing improves localization performance over that of single-frequency processing. Unlike single-frequency processing using conventional CS, which combines independent single-frequency measurement treatments by averaging, coherent multiple-frequency processing produces accurate localization without requiring a sufficient number of treated frequencies, long-time-sampled data with a time-invariant signal assumption, or even a single cavitation event. The approach is demonstrated on experimental data from a transducer source experiment and a cavitation source experiment.
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