A Source Localization Technique Based on a Ray-Trace Technique with Optimized Resolution and Limited Computational Costs

A new source localization technique is proposed in this study. The proposed source localization technique considers heterogeneity of elastic wave velocity distribution that is generally caused by local deteriorations or damages of structures on the basis of ray-trace technique. Resolutions of identified source locations are raised by installing extra source candidates near a roughly identified source location with a half of an interval of nodal and relay points in the technique. Further, the extra source candidates are installed in the vicinity of the identified source locations with a half of the previous interval, and source locations are identified again. The resolution consequently rises up to the requirement with limited computational cost by performing the procedure iteratively in the proposed technique. A series of numerical investigations were performed for verification of the proposed technique, and it was confirmed that the proposed technique identified the source locations in required resolution in a limited computational cost.