Localization of Transient Events in Dispersive Medium by Filter Bank Analysis

Paper #:
  • 2017-01-1859

Published:
  • 2017-06-05
Abstract:
Abstract: Structure-born vibrations are often required to be localized in a complex structure, but in such dispersive medium, the vibration wave propagates with speed dependent on frequency. This property of solid materials causes an adverse effect for localization of vibrational events. The cause behind such phenomena is the propagating wave envelope that changes its phase delay and amplitude in time and space as it travels in dispersive medium. This problem was previously approached by filtering a signal to focus on frequencies of the wave propagating with similar speed, what improved accuracy of cross-correlation results. However, application of this technique has not been researched for localization of vibrational sources by a localization technique. In this work we take advantage of filtering prior to cross-correlation calculation while using multiple sensors to indicate approximate location of vibration sources. We achieve this by pre-processing the acceleration by frequency filter bank prior to time of arrival algorithm. The theoretical feasibility of the proposed method is firstly tested over computer simulation, where dispersion phenomena is introduced to the system. Then an experiment on actual car frame is conducted. The results show increased accuracy in localization of transient vibration, also adding a statistical error indicator previously unavailable. Keywords: Impact localization, dispersive medium, cross-correlation, time of arrival, filter bank
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