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Abstract

The data rich nature of instrumenting civil structures provides an inherent desire to pursue novel application. Virginia Tech’s Goodwin Hall provides a unique test-bed for smart infrastructure research, with over 200 structurally-mounted synchronized accelerometers. This research explores vibration event localization in an instrumented building using under-floor accelerometers providing insight into the use of structural instrumentation systems for localization in an active building environment. Indoor localization can be difficult due to the dispersive nature of building floors, where the wave speed is frequency dependent. The potential usefulness of dispersion compensation is evaluated and compared with traditional localization techniques. Localization results are compared using peak detection, cross-correlation, and dispersion compensated cross-correlation. The peak detection method is found to perform better than cross-correlation, locating the source to within 1.86 m on average, compared to 2.21 m for cross-correlation. Dispersion compensated cross-correlation is found to perform the best, locating on average to within 1.66 m. When optimally tuning localization parameters on a per-impact basis, the dispersion compensated cross-correlation method retains the best accuracy, while the cross-correlation method shows the greatest improvement. The results suggest that the use of dispersion compensation in a building environment may improve localization results and is a promising avenue for indoor localization.

Keywords

Localization time difference of arrival structural health monitoring warped frequency transform

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Applications of dispersion compensation for indoor vibration event localization

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