Evaluation of a new source localization method in a simulated dispersive plate

Sa'ed Alajlouni; Americo Woolard; Pablo Tarazaga

doi:10.1117/12.2261550

12 April 2017 Evaluation of a new source localization method in a simulated dispersive plate

Sa'ed Alajlouni, Americo Woolard, Pablo Tarazaga

Proceedings Volume 10168, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017; 101683R (2017) https://doi.org/10.1117/12.2261550
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2017, Portland, Oregon, United States

Abstract

The problem of estimating the location of an impact force in a dispersive medium is complicated given the dispersion-related distortion of the generated traveling wave. The problem cannot be solved, with reasonable accuracy, using conventional time difference of arrival (TDOA) techniques. A building floor is an example of a dispersive medium that is being loaded by occupant footsteps. If more accurate localization algorithms are obtained, then they can be used to localize and track occupants in a building using floor vibration sensors measuring the footstep-induced traveling waves. This paper presents the evaluation of a new localization approach, in a simulated aluminum plate (dispersive waveguide), using a network of sensors measuring the plate's vibration. Average signal power is calculated for all the sensors over a fixed time period, and then used to generate a location estimate. Two different location estimation solutions are presented and compared; a constrained least squares solution (CLS), and a non-linear root finding solution generated using the Levenberg-Marquardt (LM) algorithm. A finite element (FE) thin plate model is used as a testbed to evaluate the performance of the developed localization algorithm by estimating the location of virtual hammer impacts acting on the plate. The results encourage further future development.

Citation Download Citation

Sa'ed Alajlouni, Americo Woolard, and Pablo Tarazaga "Evaluation of a new source localization method in a simulated dispersive plate", Proc. SPIE 10168, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017, 101683R (12 April 2017); https://doi.org/10.1117/12.2261550

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