The use of lamb wave, a kind of ultrasonic guided wave in plate-like structures, is a promising tool for in-situ monitoring of metallic structures. In past research, various techniques have been applied to detect and locate a single discontinuity in plate-like structures. However, relatively few studies have been conducted for detecting multiple discontinuities. This paper proposes a novel technique using lamb wave detection for the localization of multiple discontinuities based on the density-based spatial clustering of applications with noise (DBSCAN) and the k-means algorithm. To verify the feasibility and effectiveness of the proposed technique, experiments using a circular piezoelectric sensor array were carried out for a single discontinuity, double discontinuities, and triple discontinuities. The experimental results show that the novel technique has the advantages of judging the number of discontinuities automatically and locating the discontinuities on plate-like structures accurately and effectively.
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