Assessment of Large Error Time-Differences for Localization in a Plate Simulation
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The advent of structural building instrumentation invites research into novel applications of such systems. Previous research has shown that the propagative nature of ground impacts on the floor of a building can be assimilated to a thin plate. This research presents results for time-difference of arrival (TDOA) and cross-correlation methods used for source localization in a sparsely instrumented plate Finite Element Model (FEM), where acceleration data is used. The overall accuracy is evaluated for various wave speeds with two different configurations of sensor positions, and the consistency of the perceived wave speeds are assessed by the coefficient of variance. The accuracy of localization is considered, with emphasis on the sign of arrival (SOA), as a method to provide directional inference. Peak-difference and cross-correlation techniques are found to be significantly erroneous, while the SOAs are consistently accurate, with less than 10% of 126 SOAs being reported incorrectly for all cases. Repositioning the sensors closer to the boundary increased the errors for all methods.
