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Distributed Model Updating in Smart Wireless Monitoring Systems



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SOURCE Proceedings of the 2008 ASCE Structures Congress Vancouver Canada April 24 26 2008 Distributed Model Updating in Smart Wireless Monitoring Systems Authors Andrew Zimmerman University of Michigan Ann Arbor MI atzimmer umich edu Jerome P Lynch University of Michigan Ann Arbor MI jerlynch umich edu ABSTRACT A wireless sensor integrates a radio to facilitate the exchange of data by wireless communications In recent years wireless sensors have rapidly matured with current platforms offering performance levels on par with traditional tethered sensors The elimination of extensive wiring typical of tethered monitoring systems keeps the cost of wireless monitoring systems low In addition to the inclusion of a radio most wireless sensors include low power microcontrollers in their hardware design The inclusion of computational resources allows the sensor to autonomously process data a revolutionary concept not previously seen in tethered structural monitoring systems In this paper the distributed computing resources inherent to a wireless structural monitoring system are leveraged to conduct model updating A parallelized version of simulated annealing model updating procedures is embedded in a network of wireless sensors for autonomous execution Automated model updating by a wireless monitoring system allows the system to keep analytical models current for long term health monitoring of the structure INTRODUCTION On August 1 2007 the I35 Mississippi River Bridge in Minneapolis Minnesota collapsed without warning resulting in the death of 13 motorists The bridge was flagged in 1997 by Federal Highway Administration FHWA inspection guidelines as structurally deficient after corrosion fatigue cracking in steel members and dysfunctional bearings had been detected 1 In the United States approximately 20 of the national bridge inventory has been classified as structurally deficient over past years 2 In addition to the I35 bridge other bridges in the United States have been



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